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DTC 1177-EPR internal Circuitry Fault

Conditions for Setting the DTC

EPR internal circuitry test

Check condition-Engine running or cranking

MIL-On during active fault

Fault condition-

Adaptive disabled

Circuit Description

The EPR (Electronic Pressure Regulator) unit measures and controls the amount of fuel that is 
able to pass to the fuel mixer. Pressure readings are sent over the CAN to the ECM and in re-
turn the ECM sends back a control signal to the EPR to increase or decrease pressure for 
precise mixture control. This code will set if the ECM detects an internal circuitry fault in the 
EPR. In the event of multiple code sets, always start the diagnostic repair with the lowest nu-
merical value DTC first. In most instances the EPR will need to be replaced in the event of this 
code set.

Содержание HHI

Страница 1: ...2007 2009 LPG Bi 2 0L Service Manual HHI 2009 Emission Certified Bi Fuel System 2 0L Engine Service Manual Revision A June 2009 Emission Certified System Service Manual...

Страница 2: ...stic Trouble Codes DTCs Application schematic and DTC specific code information Table of Contents of this Service Manual General maintenance and maintenance interval information An overview of the LPG...

Страница 3: ...rvicing the Fuel System Step by step instructions on how repair and or replace fuel related components Definitions of phrases and acronyms used throughout this Service Manual Definitions of phrases an...

Страница 4: ...4...

Страница 5: ...5 General Information...

Страница 6: ...hnologies Inc emission warranty only work performed by IMPCO or OEM trained technicians using only IMPCO speci fied parts will qualify for reimbursement Refer to the IMPCO Labor Time Guide for ad diti...

Страница 7: ...njury Do not allow LPG to contact the skin LPG is stored in the fuel tank as a liq uid When LPG contacts the atmosphere it immediately expands into a gas resulting in a refrigeration effect that can c...

Страница 8: ...equired to perform the ne cessary procedures to safely remove and replace a failed component The installed IMPCO fuel system has been certified with the Environmental Pro tection Agency EPA and the Ca...

Страница 9: ...ways leak check any fuel system connection after servicing Use an electronic leak detector and or a liquid leak detection solution Failure to leak check could result in serious bodily injury death or...

Страница 10: ...10...

Страница 11: ...11 Maintenance...

Страница 12: ...l based anti freeze or plain water are not recommended for use in the cooling system at anytime SERPENTINE BELT SYSTEM Serpentine belts utilize a spring loaded tensioner to keep the belt properly adju...

Страница 13: ...arness connectors are cor rectly locked in by pushing in and then pulling the connector halves outward Inspect primary ignition coil wires for harden ing cracking arcing chafing burning separation spl...

Страница 14: ...ve cover 7 Add the required amount of oil to bring the level up to but not over the FULL mark on the dipstick Reinstall the oil ller cap to the valve rocker arm cover and wipe any excess oil clean CHA...

Страница 15: ...engine utilizes an in line replaceable fuel lter element This element should be replaced at the intervals speci ed in the recommended maintenance sche dule When inspecting the fuel lter check the foll...

Страница 16: ...drained at every engine oil change if contaminated or subs tandard fuel is suspected or known to have been used or in use with the emission complaint fuel system This is known as special maintenance...

Страница 17: ...Verify Throttle Body return action to ensure throttle shaft is not sticking Repair if neces sary Check for leaks at the Throttle Body and in take manifold EXHAUST SYSTEM AND CATALYTIC CONVERTER INSPE...

Страница 18: ...ty environments Replace PCV Valve X Replace inline LPG fuel filter X X X X X Check LPG shut off solenoid valve function X X Replace fuel filter Bi fuel only X X X X X Inspect Shut off Valve for leaks...

Страница 19: ...19 LPG Fuel System...

Страница 20: ...20 LPG FUEL SYSTEM OPERATION...

Страница 21: ...rning the handle to its open position fuel ows out of the tank and into the service line The service valve is also equipped with a safety feature called an excess ow check valve This feature reduces t...

Страница 22: ...ontrol module ECM ELECTRONIC PRESSURE REGULATOR EPR The EPR is a combination vaporizer and pressure regulating device The EPR functions as a nega tive pressure two stage regulator that is normally clo...

Страница 23: ...w speed mixture adjustment retained in a tamper proof housing The mixer has been preset at the factory and should not require adjustment In the event that the idle adjustment should need to be adjuste...

Страница 24: ...nti ed by a Diagnostic Trouble Code DTC number In addi tion to notifying the operator of the malfunction in the system the controller also stores the informa tion about the malfunction in its memory A...

Страница 25: ...atmospheric pressure The ECM monitors the resistance of the sensor to determine engine load the vacuum drops when the engine is under load or at wide open throttle When the engine is under load the co...

Страница 26: ...a closed loop emission system OIL PRESSURE SENDER SWITCH The Oil Pressure Switch is Mounted on the side of the Engine Block The Engine Oil Pressure switch or sender is de signed to ensure adequate lub...

Страница 27: ...27 LPG Closed Loop Schematic...

Страница 28: ...28...

Страница 29: ...29 LPG System Diagnosis...

Страница 30: ...ately negative 38 1 mm 1 5 of water column when vacuum from the engine draws in fuel The fuel is then drawn in from the secondary chamber of the EPR by the vacuum generated by air owing through the Mi...

Страница 31: ...ESSURE GAUGES 0 10 Water Column Gauge 0 10 PSI Gauge TEST DESCRIPTION The numbers below refer to step numbers on the Diagnostic Table 1 This step checks the base mechanical EPR output pressure by disa...

Страница 32: ...assembly and all intake duct ing between intake manifold and air cleaner Check air cleaner and all vehicle intake ducting for restric tions Check exhaust system for flow obstructions or leaks Check th...

Страница 33: ...Remove the spark plugs and check for the following Correct plug type for LPG application Wet electrodes oil fouling Cracks Wear Improper gap Burned electrodes Heavy deposits Were any faulty condition...

Страница 34: ...the MIL With the engine idling observe the pressure reading on the secondary pressure test port gauge Is the pressure reading within specifications 1 0 to 2 0 WC Go to Step 15 Go to Step 13 12 Turn O...

Страница 35: ...vehicle to original condition Operate the vehicle under all load and driving conditions for at least 10 minutes Park the vehicle with the engine running and connect the DST to the vehicle s DLC conne...

Страница 36: ...nd mixer gaskets or o rings for leaks All vacuum hoses and fittings for leaks Exhaust system for leaks NOTE Exhaust system leaks allow for excess O2 to dilute the HEGO sensors giving a false reading E...

Страница 37: ...orrection 3 Raise the engine speed to approximately 2500 rpm Is the Adaptive 1 fuel correction within the specified range at idle and 2500 rpms 15 to 15 Go to Step 9 Go to Step 6 6 1 Check all vacuum...

Страница 38: ...38...

Страница 39: ...39 LPG Symptom Diagnostics...

Страница 40: ...ting correctly at that time 5 Take a data snapshot using the DST under the condition that the symptom occurs to review at a later time Visual and Physical Checks Check all ECM system fuses and circuit...

Страница 41: ...eable See section Wiring Schematics Checking for poor terminal to wire connections requires removing the terminal from the connector body Operational Test If a visual and physical check does not locat...

Страница 42: ...ake system leakage between the mixer and the throttle body Verify proper operation of the low pressure lock off solenoids Verify proper operation of the fuel control solenoids Check the fuel system pr...

Страница 43: ...g Low compression Improper valve clearance Worn rocker arms Broken or weak valve springs Worn camshaft lobes Exhaust System Checks Check the exhaust system for a possible restriction Inspect the exhau...

Страница 44: ...lve is not tripped or that the LPG tank valve is not closed Check mixer assembly for proper installation and leakage Verify proper operation of the low pressure lock off solenoid Verify proper operati...

Страница 45: ...per valve clearance Worn rocker arms Broken or weak valve springs Worn camshaft lobes Check the intake and exhaust manifolds for casting ash Exhaust System Checks Check the exhaust system for a possib...

Страница 46: ...he following Ignition wires for arcing and proper routing Cross ring Primary ignition coil wires for cracks or carbon tracking Engine Mechanical Checks Perform a cylinder compression check Check the e...

Страница 47: ...racy Check Shut Off electrical connection Check the mixer air valve for sticking or binding Check the mixer assembly for proper installation and leakage Check the EPR Ignition System Checks Note LPG b...

Страница 48: ...wire in question If the meter reads over 30 000 ohms replace the wires Check the connection at primary ignition coil wire Check for deteriorated spark plug wire insulation Remove the plugs and inspec...

Страница 49: ...roper installation Check for fuel leaks between the EPR and the mixer Verify that the LPG tank valve is fully open Verify that liquid fuel not vapor is being delivered to the EPR Sensor Checks Check t...

Страница 50: ...eck the fuel economy and or suggest that a different operator use the equipment and record the results Fuel System Checks Check the EPR fuel pressure Refer to LPG Fuel System Diagnosis Check the fuel...

Страница 51: ...EPR Perform a cylinder compression test Refer to Engine Mechanical in the Service Manual Check the EPR fuel pressure Refer to the LPG Fuel System Diagnosis Check mixer assembly for proper installatio...

Страница 52: ...RECT IDLE STALLING Checks Action Engine Mechanical Check Check the engine for Broken motor mounts Improper valve timing Low compression Improper valve clearance Worn rocker arms Broken or weak valve s...

Страница 53: ...ion exists Refer to LPG Fuel System Diagnosis Verify proper fuel control solenoid operation Verify that the LPG tank valve is fully open Check the in line fuel lter for restrictions Ignition System Ch...

Страница 54: ...54...

Страница 55: ...55 Gasoline Fuel System...

Страница 56: ...56 GAS FUEL SYSTEM OPERATION...

Страница 57: ...fuel tank FUEL FILTER The fuel is drawn into the fuel pump and then through the fuel lter to trap and remove small par ticles and prevent injectors from becoming damaged Maintenance of the fuel lter...

Страница 58: ...s system which is designed and calibrated to meet the emission standards in effect for 2007 2009 The exhaust gases pass through the honeycomb catalyst which is coated with a mixture of metals such as...

Страница 59: ...the mixture If the ECM determines that a rich or lean condition is present for an extended period of time which cannot be corrected the ECM will set a diagnostic code and turn on the MIL light in the...

Страница 60: ...at when the air is cool the signal reads a higher voltage and lower when warm On cold starts the ECM richens the fuel air mixture COOLANT TEMPERATURE SENSOR The Engine Coolant Temperature sensor or EC...

Страница 61: ...61 Gasoline Closed Loop Control Schematic...

Страница 62: ...62...

Страница 63: ...63 Gasoline System Diagnosis...

Страница 64: ...lower than at mospheric pressure which creates a high vacuum This vacuum will offset the pressure regulator diaphragm resulting in a lower fuel pressure Fuel pressure at idle will vary some what depe...

Страница 65: ...dition and may set a DTC Drivability conditions can include hard starting when cold hesitation and lack of power or mis re 15 Restricting the fuel return pipe may cause the fuel pressure to build abov...

Страница 66: ...NOT start the engine Command the fuel pump ON with the DST or fuel pump test circuit Observe the fuel pressure gage with the fuel pump commanded ON Is the fuel pressure within the specified range TBD...

Страница 67: ...he fuel pressure remain constant Go to Step 17 Go to Step 9 9 Turn OFF the ignition Open the fuel feed pipe shut off valve Turn ON the ignition with the engine OFF Command the fuel pump relay ON and t...

Страница 68: ...el pump test circuit Slowly close the valve in the fuel return pipe shut off adapter while the fuel pump is oper ating Does the fuel pressure increase to more than the specified value TBD kPa TBD psi...

Страница 69: ...uel tank Did you complete the repair Go to Step 23 21 Inspect for a missing or damaged O ring seal before replacing the fuel pressure regulator If the O ring seal is not missing or damaged replace the...

Страница 70: ...70...

Страница 71: ...71 Gasoline Symptom Diagnostics...

Страница 72: ...sed loop and operating cor rectly at that time 5 Use the DST to take a snapshot under the condition that the symptom occurs Go to Engine Scan Tool Data List to verify normal sensor values and paramete...

Страница 73: ...ction Wiring Schematics Checking for poor terminal to wire connections requires removing the terminal from the connector body Operational Test If a visual and physical check does not locate the cause...

Страница 74: ...Fuel System Diagnosis Ignition System Checks Check for the proper ignition voltage output with J 26792 or the equiva lent Verify that the spark plugs are the correct type and properly gapped Check the...

Страница 75: ...ctrical circuit Verify proper fuel pump pressure Verify proper fuel rail pressure Check the in line fuel lter for restrictions Refer to the Gasoline Fuel System Diagnosis Ignition System Checks Check...

Страница 76: ...t system for a possible restriction Inspect the exhaust system for damaged or collapsed pipes Inspect the muffler for signs of heat distress or for possible internal failure Check for possible plugged...

Страница 77: ...y inspect the secondary ignition for the following Ignition wires for arcing and proper routing Cross ring Primary ignition coil wires for cracks or carbon tracking Engine Mechanical Checks Perform a...

Страница 78: ...ine Fuel System Diagnosis Check electrical connections of fuel injectors Ignition System Checks Check for the proper ignition voltage output with J 26792 or the equiva lent Remove Spark Plugs Verify t...

Страница 79: ...the wires Check the connection at primary ignition coil wire Check for deteriorated spark plug wire insulation Check the spark plugs Remove the plugs and inspect them for the following conditions Wet...

Страница 80: ...eck the Heated Exhaust Gas Oxygen Sensor HEGO for contamina tion and performance Check for proper operation of the MAP sensor Check for proper operation of the TPS and FPP sensors Exhaust System Check...

Страница 81: ...el tank and to recheck the fuel econo my and or suggest that a different operator use the equipment and record the results Fuel System Checks Refer to Gas Fuel System Diagnosis Check the fuel system f...

Страница 82: ...ine fuel lter for restrictions Refer to the Gas Fuel System Diagnosis Ignition System Checks Check for the proper ignition output voltage using the spark tester J26792 or the equivalent Remove the plu...

Страница 83: ...oblem Check the fuel pressure while the condition exists Refer to Gas Fuel System Diagnosis Check the in line fuel lter for restrictions Ignition System Checks Check for the proper ignition output vol...

Страница 84: ...84...

Страница 85: ...85 Electrical Section...

Страница 86: ...86...

Страница 87: ...87 Diagnostic Scan Tool...

Страница 88: ...es and descriptions of parts and servicing procedures will be updated based on trade brand or common description to more accurately describe the part or service pro cedure DST INSTALLATION INSTRUCTION...

Страница 89: ...89 Open the DST_Series III folder Open the Latest_GCP_Display folder...

Страница 90: ...e to start the windows installer If a previous version of the GCP software is installed the uninstaller may remove the previous version and exit You will be required to start the installer again to in...

Страница 91: ...91 Click Next to continue Click Next to continue...

Страница 92: ...92 Click the Finish box to complete the installation Click Yes to restart your computer...

Страница 93: ...93 Once installed the software can be accessed from Start Menu Programs Impco GCP Display Impco GCP Display...

Страница 94: ...ADAPTER DRIVER If your computer does not have an RS232 serial port you will need to install the USB adapter driver You do not need to install this driver if you plan to use the ECOM DLC cable Open the...

Страница 95: ...iver The ECOM USB cable is designed to replace both the serial DLC and the USB adapter cables It also provides communication to the ECM on the CAN line for systems that are CAN enabled It requires the...

Страница 96: ...96 Double click on setup exe application file Click Next to continue...

Страница 97: ...97 Select install ECOM drivers only Click Next and follow the on screen prompts...

Страница 98: ...serial number and permits authorized service personnel to make changes or view information for a specific ECM 3 In most instances the top all serial number boxes should be used for password entry In t...

Страница 99: ...number for which the Single Serial Number Access password applies NOTE Leading zeros included in the serial number are not required Save Password and S N Checkbox Retains the password and serial numb...

Страница 100: ...ftware will load but will not connect to the target ECM Figure 4 Not Authorized to Connect Message In the event you receive this error message call your OEM support group for more information CONNECTI...

Страница 101: ...l sche matic The DLC is located on the engine harness The new 8 pin DLC requires the use of the 4 to 8 pin adapter included in the late model ITK test kits Turn the computer ON Start Windows From the...

Страница 102: ...You will now need to configure the ECOM communication protocol Select the CAN for systems with CAN enabled or serial for all others Then select OK You are now ready to connect using the ECOM USB DLC c...

Страница 103: ...103 DST SERVICE PAGES Gauge Page Provides system data in large easy to read displays Displays ECM configuration information for the ECM software hardware serial numbers and calibration dates...

Страница 104: ...104 Raw Volts Page The raw volts page displays the sensor inputs and outputs in a raw voltage format This page is most commonly used to check values in the diagnostic trouble shooting charts Service 1...

Страница 105: ...ttle command will lock into the position it was in when the test mode was entered If the Spark System Test mode is selected with the engine running above 1000 rpm the throttle will continue to operate...

Страница 106: ...DBW Drive by Wire test mode allows the technician to control the throttle directly with the foot pedal or throttle input and is used during the diagnostic routines specified for FPP and TPS for Spec t...

Страница 107: ...er to graphically plot or numerically log variables that have been tagged for plotting logging To plot or log variables a tag must be assigned to each variable of interest A variable is tagged for plo...

Страница 108: ...8 Figure 5 Tagged Variables for Plot Log Once the variables have been tagged as highlighted by the green color fill select the Plot Log func tion in the top menu bar as shown below in figure 6 Figure...

Страница 109: ...o a snapshot that may be panned zoomed scrolled and saved Close Button Close the DST Plot interface Load Setup Button Load tags from a previously saved plot plt file to allow for similar plots and log...

Страница 110: ...110 Figure 7 DST Plot Click on the Start button to start the DST plot function Click on the variable selector button to view selected sensors Variable selector Start plot...

Страница 111: ...111 Figure 8 DST Plot Snapshot Click on the Save button to save the snapshot as a file To replay the saved file open the edis_saplot program from the windows start menu...

Страница 112: ...T KEY FUNCTIONS Command Function Single left click on trace Snap closest cursor to data Ctrl Up Down Arrows Move pan plot along y axis Ctrl Left Right Arrows Move pan plot along t axis Ctrl Shift Up D...

Страница 113: ...t file may then be viewed by any standard Windows text editor reader program To create a log file select the Log Tags in the drop down menu as shown in figure 6 Figure 9 DST Log Interface REPROGRAMMIN...

Страница 114: ...nnected to the ECM From the File menu select Reprogram target Navigate to the media where you have stored the MOT file In the example above the MOT file was stored on the on the floppy A drive Highlig...

Страница 115: ...her functions on the computer while the download takes place Do not disconnect the DLC remove power or use the PC for any other func tion during this process Any interruption during this reprogram pro...

Страница 116: ...116 Message is displayed confirming the update was successful...

Страница 117: ...to fail the test the lamp will stay illuminated and the DTC is stored as an active DTC If the self test runs and passes the DTC will be stored as historic DTC All DTCs are stored as historic faults u...

Страница 118: ...n follow the DTC diagnostic chart rec ommendations for that specific DTC BLINK CODE FUNCTION Although the DST is considered a required tool to access the DTC codes codes may be retrieved with out a la...

Страница 119: ...One excellent tool for finding intermittent electrical problems is the DST plot log function Set up the plot for the code that sets An example of this would be if an intermittent IAT code set tag the...

Страница 120: ...120...

Страница 121: ...121 Engine Wire Schematic...

Страница 122: ...122 HHI 2007 2009 Emission Certified LPG Bi Fuel System 2 0L Engine...

Страница 123: ...MP 776286 1 Gold Pin 16 Manifold Assy Female 4P AMP 368162 1 17 Injector 1 Female 2P KET MG641152 KUM PU465 02127 18 Injector 2 Female 2P KET MG641152 KUM PU465 02127 19 Injector 3 Female 2P KET MG641...

Страница 124: ...124...

Страница 125: ...125 Engine Wire Harness Repair...

Страница 126: ...xible connectors used to probe terminals during diagnosis Fuse remover and test tool BT 8616 or equivalent is used for re moving a fuse and to adapt fuse holder with a meter for diagnosis Do not solde...

Страница 127: ...wire is inserted through the seal and connector the terminal is crimped on the wire and then pulled back into the connector to seat it in place Metri Pack Series 150 Terminal Removal 1 Slide the seal...

Страница 128: ...n ordinary pick there is a good chance that the terminal will be bent or deformed Unlike standard blade type terminals these terminals cannot be straigh tened once they are bent Verify that the connec...

Страница 129: ...129 Diagnostic Trouble Codes DTCs...

Страница 130: ...onization MIL Command ON Circuit Description The Crankshaft position sensor is a 5 volt powered sensor mounted in the engine block A pulse wheel located on the crankshaft is used to measure engine rpm...

Страница 131: ...CM connector CN1 Using a DVOM check for continuity on the crank signal circuit 125 between CKP con nector CN9 and ECM connector CN1 Do you have continuity between them Go to Step 5 Repair the circuit...

Страница 132: ...After operating the engine within the test pa rameters of DTC 16 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 9 11 Remove all test equipment e...

Страница 133: ...133...

Страница 134: ...re and pressure sensor located in the gasoline delivery system that provides accurate gasoline supply information to the ECM It is used to measure the temperature and pressure of the supplied fuel Thi...

Страница 135: ...0 volts Go to Step 4 Go to Step 6 4 Check wire harness and FRP sensor con nector for damage corrosion or contamination Any problems found Repair the circuit as ne cessary See wire harness repair sec t...

Страница 136: ...n or contami nation Any problems found Repair the circuit as ne cessary See wire harness repair sec tion Go to Step 10 10 Replace the ECM Is the replacement complete Go to Step 11 11 Remove all test e...

Страница 137: ...137...

Страница 138: ...ption The Manifold Absolute Pressure sensor is a pressure transducer connected to the intake mani fold It is used to measure the pressure of air in the intake manifold This reading is used in conjunct...

Страница 139: ...4 50 volts or greater Go to Step 4 Go to Step 8 4 Inspect MAP connector and pins for cor rosion contamination or mechanical damage Any problems found Repair the circuit as necessary Refer to Wir ing R...

Страница 140: ...sary Refer to Wir ing Repairs in Engine Electrical 10 Check for continuity between MAP sensor connector CN4 5 volt reference circuit 119 and engine ground Do you have continuity Repair the circuit as...

Страница 141: ...Replace ECM Refer to ECM replacement in the Engine Controls Section Is the replacement complete Go to Step 18 17 Replace MAP sensor Is the replacement complete Go to Step 18 18 Remove all test equipm...

Страница 142: ...lute Pressure sensor is a pressure transducer connected to the intake mani fold It is used to measure the pressure of air in the intake manifold This reading is used in conjunction with other inputs t...

Страница 143: ...ector CN4 Key ON Does the DST display MAP pressure less than 0 05 psia Go to Step 4 Go to Step 6 4 Probe MAP connector CN4 ground circuit 120 with a test light connected to battery vol tage Does the t...

Страница 144: ...11 10 Correct MAP mechanical connection Has the MAP mechanical connection problem been corrected Go to Step 11 11 Remove all test equipment except the DST Connect any disconnected components fus es e...

Страница 145: ...145...

Страница 146: ...ut in conjunction with other sensors is used to determine the airflow to the engine The ECM provides a voltage di vider circuit so that when the air is cool the signal reads higher voltage and lower w...

Страница 147: ...f high inlet air temperature is a problem with the inlet air system Ensure that the air inlet is not obstructed modified or damaged Inspect the air inlet system for cracks or breaks that may allow unw...

Страница 148: ...ature sensitive resistor is used in the TMAP located in the intake manifold of the engine It is used to monitor incoming air temperature and the output in conjunction with other sensors is used to det...

Страница 149: ...4 90 volts or greater Go to Step 4 Go to Step 5 4 Replace TMAP sensor Is the replacement complete Go to Step 9 5 Key OFF Disconnect ECM wire harness connector CN1 Check for continuity between TMAP se...

Страница 150: ...nts fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe...

Страница 151: ...151...

Страница 152: ...re sensitive resistor is used in the TMAP located in the intake manifold of the engine It is used to monitor incoming air temperature and the output in conjunction with other sensors is used to determ...

Страница 153: ...N4 signal circuit 136 to engine ground Key ON Does DST display IAT voltage of 0 10 volts or less 0 10 volts or less Go to Step 7 Go to Step 6 5 Replace TMAP sensor Is the replacement complete Go to St...

Страница 154: ...s found Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical Go to Step 8 11 Remove all test equipment except the DST Connect any disconnected components fus es etc Using th...

Страница 155: ...155...

Страница 156: ...enrichment and to enable other temperature dependant features The ECM provides a voltage divider circuit so that when the coolant is cool the signal reads higher voltage and lower when warm This fault...

Страница 157: ...t lines and hoses water pump engine block radiator etc Insure the radiator cap is in good repair and maintaining suitable cooling system pressure Compare the ECM measured temperature value with an ana...

Страница 158: ...lculation gasoline cold enrichment and to ena ble other temperature dependant features The ECM provides a voltage divider circuit so that when the coolant is cool the signal reads higher voltage and l...

Страница 159: ...oltage of 4 90 volts or greater Go to Step 4 Go to Step 5 4 Replace ECT sensor Is the replacement complete Go to Step 8 5 Key OFF Disconnect ECM wire harness connector CN1 Check for continuity between...

Страница 160: ...nts fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe...

Страница 161: ...161...

Страница 162: ...n gasoline cold enrichment and to enable other temperature dependant features The ECM provides a voltage divider circuit so that when the coolant is cool the signal reads higher voltage and lower when...

Страница 163: ...DST and com pare the reading at a known temperature to the chart Is the resistance value correct See resis tance chart vs tempera ture in the DTC 118 circuit de scription Go to Step 6 Go to Step 5 5 R...

Страница 164: ...nd 137 for damage corrosion or contamination Did you find a problem Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical Go to Step 11 11 Replace ECM Is the replacement comp...

Страница 165: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 166: ...e throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS 1 will read low voltage when closed and TPS 2 will read high voltage when closed The TPS 1 and...

Страница 167: ...Step 4 4 Key OFF Disconnect ECM wiring harness connector CN1 Key ON Using a DVOM check for voltage between ECM connector CN1 TPS 1 signal circuit 147 and engine ground Do you have voltage Repair the T...

Страница 168: ...in Engine Elec trical 10 Inspect ECM connector terminals for damage corrosion or contamination Any problems found Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical Go to...

Страница 169: ...169...

Страница 170: ...within the throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS1 will read lower voltage when closed and TPS2 will read higher voltage when closed Th...

Страница 171: ...circuit 119 and TPS 1 signal circuit 147 together at the throt tle connector CN3 Key ON Does DST display TPS 1 voltage of 4 0 volts or greater Go to Step 7 Go to Step 5 5 Key OFF Disconnect ECM wire...

Страница 172: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 173: ...173...

Страница 174: ...used within the throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS1 will read lower voltage when closed and TPS2 will read higher voltage when close...

Страница 175: ...to Step 5 5 Key OFF Disconnect ECM wire harness connector CN1 Key ON Using a DVOM check for voltage between TPS 1 signal circuit 147 at the ECM connec tor CN1 and engine ground Do you have voltage Re...

Страница 176: ...Engine Elec trical 11 Remove all test equipment except the DST Connect any disconnected components fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 second...

Страница 177: ...177...

Страница 178: ...ensor A temperature sensitive resistor is used in the TMAP located in the intake manifold of the engine It is used to monitor incoming air temperature and the output in conjunction with other sensors...

Страница 179: ...of high inlet air temperature is a problem with the inlet air system Ensure that the air inlet is not obstructed modified or damaged Inspect the air inlet system for cracks or breaks that may allow un...

Страница 180: ...Fault Condition BP less than 8 30 psia MIL On for active fault Adaptive Disabled Circuit Description The BP Barometric Pressure is estimated from the TMAP sensor The barometric pressure value is used...

Страница 181: ...blems found Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical Go to Step 5 5 Key OFF Disconnect ECM connector CN1 Check for continuity between TMAP sensor connector CN4 c...

Страница 182: ...er to Wir ing Repairs in Engine Elec trical Go to Step 11 11 Inspect TMAP and ECM connector pins for corrosion contamination or mechanical damage Any problems found Repair the circuit as ne cessary Re...

Страница 183: ...18 17 Replace TMAP sensor Is the replacement complete Go to Step 18 18 Remove all test equipment except the DST Connect any disconnected components fus es etc Using the DST clear DTC information from...

Страница 184: ...e Disabled during active fault Closed Loop Disabled during active fault Circuit Description The EGO 1 sensor is used to determine if the fuel flow to the engine is correct by measuring the oxygen cont...

Страница 185: ...sconnect EGO 1 connector CN11 Key ON Using a DVOM check for voltage at the EGO 1 connector CN11 between circuits 812 and 162 Check must be made within 30 seconds or before power relay shuts down Do yo...

Страница 186: ...k for continuity on the sensor ground circuit 120 between EGO 1 connector CN5 and ECM connector CN1 Do you have continuity Go to Step 10 Repair open EGO 1 signal ground 10 Replace EGO 1 sensor Is the...

Страница 187: ...187...

Страница 188: ...sensor cold persistently more than 55 seconds MIL On during active fault Adaptive Disabled during active fault Closed Loop Disabled during active fault Circuit Description The EGO 2 sensor is used to...

Страница 189: ...r CN12 circuits 812 and 161 Check must be made within 30 seconds or before power relay shuts down Do you have voltage Go to Step 8 Go To Step 4 4 Key OFF Using a DVOM check for voltage between EGO 2 c...

Страница 190: ...ontinuity Go to Step 10 Repair open EGO 2 signal ground 10 Replace EGO 2 sensor Is the replacement complete Go to Step 11 11 Remove all test equipment except the DST Connect any disconnected component...

Страница 191: ...191...

Страница 192: ...ystem diagnostic checks before using the following diagnostic chart Diagnostic Aid Oxygen Sensor Wire Heated Oxygen sensor wires may be mis routed and contacting the ex haust manifold Vacuum Leaks Vac...

Страница 193: ...codes before pro ceeding with this chart Always repair existing codes starting with the lowest numerical code set first Have any other DTC codes been detected diag nosed and repaired Go to Step 9 Go...

Страница 194: ...ave continuity Go to Step 8 Repair the open EGO heater ground 8 Replace EGO 1 sensor Is the replacement complete Go to Step 9 9 Remove all test equipment except the DST Connect any disconnected compon...

Страница 195: ...195...

Страница 196: ...perly High fuel pressure due to a faulty fuel regulator or obstructed fuel return line will cause the system to run rich Ignition noise Open or poor ground circuit to or in the ignition system or ECM...

Страница 197: ...rounds for being clean and tight Fuel system diagnostic checks Was a repair made Go to Step 6 Go to Step 4 3 Diagnose any other DTC codes before pro ceeding with this chart Have any other DTC codes be...

Страница 198: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 199: ...199...

Страница 200: ...et of the elec tronic pressure regulator It is used to help determine fuel charge density for accurate fuel mixture control The ECM provides a voltage divider circuit so that when the sensor is cool t...

Страница 201: ...display FT voltage of 4 90 volts or greater Go to Step 4 Go to Step 5 4 Replace FT sensor Is the replacement complete Go to Step 8 5 Key OFF Disconnect ECM wire harness connector CN1 Check for continu...

Страница 202: ...nents fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Obser...

Страница 203: ...203...

Страница 204: ...d in the gasoline supply line It is used to help determine fuel charge density for accurate fuel mixture control The ECM provides a voltage divider circuit so that when the sensor is cool the signal r...

Страница 205: ...ance be tween the two terminals of the FT sensor and compare the resistance reading to the chart Is the resistance value correct See tem perature vs resistance chart in the DTC 183 schematic page Go t...

Страница 206: ...Using a DVOM check for continuity on the sensor ground circuit 120 between fuel tem perature sensor and ECM connector Do you have continuity between them Go to Step 10 Repair the circuit as ne cessar...

Страница 207: ...cor rosion or contamination Did you find a problem Repair the cir cuit as necessary Refer to Wiring Repairs in En gine Electrical Go to Step 11 14 Remove all test equipment except the DST Connect any...

Страница 208: ...el outlet of the electronic pressure regulator It is used to help determine fuel charge density for accu rate fuel mixture control The ECM provides a voltage divider circuit so that when the sensor is...

Страница 209: ...T voltage of 4 90 volts or greater Go to Step 4 Go to Step 5 4 Replace FT sensor Is the replacement complete Go to Step 8 5 Key OFF Disconnect ECM wire harness connector CN1 Check for continuity betwe...

Страница 210: ...nents fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Obser...

Страница 211: ...211...

Страница 212: ...the fuel outlet of the electronic pressure regulator It is used to help determine fuel charge density for accu rate fuel mixture control The ECM provides a voltage divider circuit so that when the se...

Страница 213: ...ween the two terminals of the FT sensor and compare the resistance reading to the chart Is the resistance value correct See tem perature vs resistance chart in the DTC 188 schematic page Go to Step 6...

Страница 214: ...Using a DVOM check for continuity on the sensor ground circuit 120 between fuel tem perature sensor and ECM connector Do you have continuity between them Go to Step 10 Repair the circuit as ne cessar...

Страница 215: ...corrosion or contamination Did you find a problem Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical Go to Step 11 14 Remove all test equipment except the DST Connect any...

Страница 216: ...gasoline cold enrichment and to enable other temperature dependant features The ECM provides a voltage divider circuit so that when the coolant is cool the signal reads higher voltage and lower when w...

Страница 217: ...lines and hoses water pump engine block radiator etc Insure the radiator cap is in good repair and maintaining suitable cooling system pressure Compare the ECM measured temperature value with an anal...

Страница 218: ...for Setting the DTC Max Govern Speed Override Check Condition Engine Running Fault Condition Engine rpm greater than 3900 MIL On during active fault Circuit description This fault will set anytime the...

Страница 219: ...the ECM to ensure the correct calibration is in use Is the Service Part Number Correct Go to Step 6 Go to Step 5 5 Replace ECM with correct service part num ber Is the replacement complete Go to Step...

Страница 220: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 221: ...221...

Страница 222: ...gnal voltage based on throttle plate position TPS 1 will read lower voltage when closed and TPS 2 will read higher voltage when closed The TPS 1 and TPS 2 percentages are calcu lated from these voltag...

Страница 223: ...o Step 4 4 Key OFF Disconnect ECM wiring harness connector CN1 Key ON Using a DVOM check for voltage between ECM connector TPS 1 signal circuit 148 and engine ground Do you have voltage Repair the TPS...

Страница 224: ...airs in Engine Elec trical 10 Inspect ECM connector terminals for damage corrosion or contamination Any problems found Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical G...

Страница 225: ...225...

Страница 226: ...sed within the throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS1 will read lower voltage when closed and TPS2 will read higher voltage when closed...

Страница 227: ...circuit 119 and TPS 2 signal circuit 148 together at the throt tle connector CN3 Key ON Does DST display TPS 2 voltage of 4 0 volts or greater Go to Step 7 Go to Step 5 5 Key OFF Disconnect ECM wire...

Страница 228: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 229: ...229...

Страница 230: ...thin the throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS1 will read lower voltage when closed and TPS2 will read higher voltage when closed The T...

Страница 231: ...to Step 7 Go to Step 5 5 Key OFF Disconnect ECM wire harness connector CN1 Key ON Using a DVOM check for voltage between electronic throttle connector TPS 2 signal cir cuit 148 and engine ground Do y...

Страница 232: ...Elec trical 11 Remove all test equipment except the DST Connect any disconnected components fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start...

Страница 233: ...233...

Страница 234: ...Disabled Circuit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing a ground signal to pulse the injector ON This fault will set if t...

Страница 235: ...degrees F Does the DVOM display a resistance value of 20 ohms or less 20 ohms or less Go to Step 5 Go to Step 4 4 Replace the Fuel Injector Is the replacement complete Go to Step 8 5 Disconnect the in...

Страница 236: ...ST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and dr...

Страница 237: ...237...

Страница 238: ...uit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing ground to pulse the injector This fault will set if the ECM detects high feedb...

Страница 239: ...stance between the fuel injector pins at the fuel metering body at an ambient tem perature of 50 to 90 degrees F Does the DVOM display a resistance value of 5 ohms or more Greater than 5 0 Ohms Go to...

Страница 240: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 241: ...241...

Страница 242: ...Disabled Circuit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing a ground signal to pulse the injector ON This fault will set if t...

Страница 243: ...degrees F Does the DVOM display a resistance value of 20 ohms or less 20 ohms or less Go to Step 5 Go to Step 4 4 Replace the Fuel Injector Is the replacement complete Go to Step 8 5 Disconnect the in...

Страница 244: ...ST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and dr...

Страница 245: ...245...

Страница 246: ...uit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing ground to pulse the injector This fault will set if the ECM detects high feedb...

Страница 247: ...re the resistance between the fuel injector pins at the fuel metering body at an ambient tem perature of 50 to 90 degrees F Does the DVOM display a resistance value of 5 ohms or more Greater than 5 0...

Страница 248: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 249: ...249...

Страница 250: ...Disabled Circuit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing a ground signal to pulse the injector ON This fault will set if t...

Страница 251: ...t an ambient tem perature of 50 to 90 degrees F Does the DVOM display a resistance value of 20 ohms or less 20 ohms or less Go to Step 5 Go to Step 4 4 Replace the Fuel Injector Is the replacement com...

Страница 252: ...ST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and dr...

Страница 253: ...253...

Страница 254: ...uit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing ground to pulse the injector This fault will set if the ECM detects high feedb...

Страница 255: ...stance between the fuel injector pins at the fuel metering body at an ambient tem perature of 50 to 90 degrees F Does the DVOM display a resistance value of 5 ohms or more Greater than 5 0 Ohms Go to...

Страница 256: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 257: ...257...

Страница 258: ...Disabled Circuit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing a ground signal to pulse the injector ON This fault will set if t...

Страница 259: ...of 50 to 90 degrees F Does the DVOM display a resistance value of 20 ohms or less 20 ohms or less Go to Step 5 Go to Step 4 4 Replace the Fuel Injector Is the replacement complete Go to Step 8 5 Disc...

Страница 260: ...ST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and dr...

Страница 261: ...261...

Страница 262: ...cuit Description System battery voltage is supplied to each fuel injector The ECM controls each fuel injector by providing ground to pulse the injector This fault will set if the ECM detects high feed...

Страница 263: ...stance between the fuel injector pins at the fuel metering body at an ambient tem perature of 50 to 90 degrees F Does the DVOM display a resistance value of 5 ohms or more Greater than 5 0 Ohms Go to...

Страница 264: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 265: ...265...

Страница 266: ...800 ms MIL On during active fault Adaptive Disabled Circuit Description The Crankshaft position sensor is a 5 volt powered sensor mounted to the lower front engine block A pulse wheel located on the c...

Страница 267: ...nect ECM connector CN1 Using a DVOM check for continuity between CKP connector circuit 125 and ECM connec tor circuit 125 Do you have continuity between them Go to Step 5 Repair the circuit as ne cess...

Страница 268: ...After operating the engine within the test pa rameters of DTC 336 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 9 11 Remove all test equipment e...

Страница 269: ...269...

Страница 270: ...ive Disabled Circuit Description The Crankshaft position sensor is a 5 volt powered sensor mounted to the lower front engine block A pulse wheel located on the crankshaft is used to measure engine rpm...

Страница 271: ...to Step 4 Repair the circuit as necessary Refer to Wir ing Repairs in Engine Electrical 4 Key OFF Disconnect ECM connector CN1 Using a DVOM check for continuity on crank signal circuit 125 between CK...

Страница 272: ...icle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the engine within the test pa rameters of DTC 337 check for any stored codes Does the eng...

Страница 273: ...273...

Страница 274: ...r Running Fault Condition 1 invalid cam re sync in 700ms or less Adaptive learn disabled MIL On Circuit Description The CMP Camshaft Position Sensor is used to synchronize the fuel and ignition system...

Страница 275: ...CM connector CN1 Using a DVOM check for continuity on the CMP signal circuit 127 between CMP con nector CN2 and ECM connector CN1 Do you have continuity between them Go to Step 5 Repair the circuit as...

Страница 276: ...After operating the engine within the test pa rameters of DTC 341 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 9 11 Remove all test equipment e...

Страница 277: ...277...

Страница 278: ...5 cycles with engine speed greater than 1000 rpm MIL On for active fault Adaptive Disabled Circuit Description The CMP Camshaft Position Sensor is used to synchronize the fuel and ignition systems Th...

Страница 279: ...u have voltage 5 0 volts Go to Step 4 Repair the circuit as ne cessary Refer to wir ing harness repair sec tion 4 Key OFF Disconnect ECM connector CN1 Using a DVOM check for continuity on the CMP sign...

Страница 280: ...e to full operating temperature Observe the MIL Observe engine performance and driveability After operating the engine within the test pa rameters of DTC 342 check for any stored codes Does the engine...

Страница 281: ...281...

Страница 282: ...seconds MIL On Circuit Description The LPG shut off valve is supplied system battery power from the VSW fused source The ECM then provides a path to ground to turn the valve on This fault will set in...

Страница 283: ...e until the engine stops THIS MAY TAKE SEVERAL MINUTES Did the engine ever stop Intermittent problem See intermittent problems in the electrical section of this manual Go to Step 4 4 Replace the LPG s...

Страница 284: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and drivability After operating the...

Страница 285: ...285...

Страница 286: ...Disabled during active fault Closed Loop Disabled during active fault Circuit Description The catalyst monitor test is run under certain operating conditions to determine if the catalyst is functionin...

Страница 287: ...system for visual signs of damage leaks or modification and repair if necessary Insure the pre catalyst and post catalyst oxygen sensors are mounted correctly and wiring is not damaged melted or corr...

Страница 288: ...ommunicate a low oil pressure condition to the ECM En gine damage can occur if the engine is operated with low oil pressure The ECM uses an analog voltage input with an internal voltage reference If t...

Страница 289: ...he engine to shut down Go to Step 4 Intermittent problem Go to Inter mittent section 4 Key OFF Disconnect the oil pressure switch harness connector CN8 and ground it to a good en gine ground Clear DTC...

Страница 290: ...to Step 9 9 Remove all test equipment except the DST Connect any disconnected components fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the...

Страница 291: ...291...

Страница 292: ...M less than 9 0 MIL On for active fault Adaptive Disabled Circuit Description The battery voltage powers the ECM and must be measured to correctly to properly operate in jector drivers solenoid valves...

Страница 293: ...Check charging system Is it OK Go to Step 5 Repair charg ing System 5 Key OFF Disconnect the ECM connector CN1 Using a DVOM check the voltage between ECM connector CN1 circuits 160 and 179 and engine...

Страница 294: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 295: ...295...

Страница 296: ...ve Disabled Circuit Description The battery voltage powers the ECM and must be measured to correctly operate injector driv ers trim valves and ignition coils This fault will set if the ECM detects vol...

Страница 297: ...m Is it greater than 16 volts Go to Step 4 Go to Step 5 4 Repair the charging system Has the charging system been repaired Go to Step 6 5 Replace ECM Is the replacement complete Go to Step 6 6 Remove...

Страница 298: ...ate level 2 Circuit Description The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will...

Страница 299: ...K Go to Step 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect...

Страница 300: ...2 Circuit Description The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will cause th...

Страница 301: ...o Step 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect any d...

Страница 302: ...ion The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will cause this fault The ECM wi...

Страница 303: ...tep 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect any disc...

Страница 304: ...switches power out to the fuel pump for operation on gasoline fuel This fault will set if the ECM detects an open circuit on the relay control output Diagnostic Aid Relay coil resistance changes with...

Страница 305: ...place ECM fuse Go to Step 5 5 Disconnect ECM connector CN1 Using a DVOM check for continuity between ECM connector CN1 circuit 178 and fuel pump relay circuit 178 Do you have continuity Go to Step 6 R...

Страница 306: ...DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and d...

Страница 307: ...307...

Страница 308: ...pump relay switches power out to the fuel pump for operation on gasoline fuel This fault will set if the ECM detects a short to ground on the relay control output Diagnostic Aid Relay coil resistance...

Страница 309: ...again between ECM connector circuit 178 and engine ground Is the resistance less than 60 ohms Repair the shorted to ground relay control circuit as necessary See wiring harness re pairs Go to Step 5...

Страница 310: ...switches power out to the fuel pump for operation on gasoline fuel This fault will set if the ECM detects a short circuit to power on the relay control output Diagnostic Aid Relay coil resistance cha...

Страница 311: ...uity between them Go to Step 3 Go to Step 5 5 Key OFF Disconnect ECM wire harness connector CN1 Using a DVOM check for power between ECM connector circuit 178 and engine ground with the key ON Do you...

Страница 312: ...DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and d...

Страница 313: ...313...

Страница 314: ...rcuit Description The external 5 volt supply powers many of the sensors and other components of the fuel sys tem The accuracy of the 5 volt supply is very important to the accuracy of the powered sens...

Страница 315: ...lace ECM Is the replacement complete Go to Step 7 5 While monitoring DVOM for continuity be tween ECM 5 volt reference circuit 119 and engine ground Disconnect each sensor below one at a time to find...

Страница 316: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 317: ...317...

Страница 318: ...nal 5 volt supply powers many of the sensors and other components in the fuel sys tem The accuracy of the 5 volt supply is very important to the accuracy of the powered sensors and fuel control by the...

Страница 319: ...M connector CN1 Key ON Using DVOM check for Voltage between ECM connector CN1 circuit 119 and engine ground Do you have voltage Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec...

Страница 320: ...us sensors actuators and solenoids in the fuel system This fault will set if the ECM detects an open circuit on the relay control output Diagnostic Aid Relay coil resistance changes with temperature T...

Страница 321: ...use Go to Step 5 5 Disconnect ECM connector CN1 Using a DVOM check for continuity between ECM connector CN1 circuit 173 and power relay circuit 173 Do you have continuity Go to Step 6 Repair the open...

Страница 322: ...DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and d...

Страница 323: ...323...

Страница 324: ...ower out to various sensors actuators and solenoids in the fuel system This fault will set if the ECM detects a short to ground on the relay control output Diagnostic Aid Relay coil resistance changes...

Страница 325: ...een ECM connector circuit 173 and engine ground Is the resistance less than 60 ohms Repair the shorted to ground relay control circuit as necessary See wiring harness re pairs Go to Step 5 5 Replace t...

Страница 326: ...various sensors actuators and solenoids in the fuel system This fault will set if the ECM detects a short circuit to power on the relay control output Diagnostic Aid Relay coil resistance changes wit...

Страница 327: ...them Go to Step 3 Go to Step 5 5 Key OFF Disconnect ECM wire harness connector CN1 Using a DVOM check for power between ECM connector circuit 173 and engine ground with the key ON Do you have power Sy...

Страница 328: ...DST clear DTC information from the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and d...

Страница 329: ...329...

Страница 330: ...ine Running Fault Condition Engine rpm greater than 4 000 MIL On during active fault Circuit Description This fault will set anytime Engine rpm is greater than 4 000 When these conditions are met the...

Страница 331: ...umber on the ECM to ensure correct calibration is in use Is the service part number correct Go to Step 6 Go to Step 5 5 Replace ECM with the correct service part number Is the replacement complete Go...

Страница 332: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the...

Страница 333: ...333...

Страница 334: ...Condition Engine RPM greater than 4200 MIL On during active fault Engine Shut Down Circuit description This fault will set anytime the engine RPM exceeds 3900 During this condition the ECM will shut o...

Страница 335: ...correct calibration is in use Is the service part number Correct Go to Step 6 Go to Step 5 5 Replace ECM with correct service part Num ber Is the replacement complete Go to Step 9 6 Check the mechanic...

Страница 336: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the...

Страница 337: ...337...

Страница 338: ...ify the fuel flow within its limits Diagnostic Aid Oxygen Sensor Wire Heated Oxygen sensor wires may be mis routed and contacting the ex haust manifold Vacuum Leaks Large vacuum leaks and crankcase le...

Страница 339: ...C codes before pro ceeding with this chart Always repair existing codes starting with the lowest numerical code set first Have any other DTC codes been detected diag nosed and repaired Go to Step 9 Go...

Страница 340: ...Do you have continuity Go to Step 8 Repair the open EGO heater ground 8 Replace EGO 1 sensor Is the replacement complete Go to Step 9 9 Remove all test equipment except the DST Connect any disconnecte...

Страница 341: ...341...

Страница 342: ...r This fault sets if the Closed Loop multiplier exceeds the limits of normal operation When the multiplier cannot correctly modify the fuel flow within its limits it is limited at 35 Diagnostic Aid Fu...

Страница 343: ...ng clean and tight Run the fuel system diagnostic checks Was a repair made Go to Step 6 Go to Step 4 3 Diagnose any other DTC codes before pro ceeding with this chart Have any other DTC codes been det...

Страница 344: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the...

Страница 345: ...345...

Страница 346: ...stem diagnostic checks before using the following diagnostic chart Diagnostic Aid Oxygen Sensor Wire Heated Oxygen sensor wires may be mis routed and contacting the ex haust manifold Vacuum Leaks Vacu...

Страница 347: ...ne Electrical Power and Ground Distri bution Fuel System Diagnostics Refer to Fuel Sys tem Diagnostics Was a repair made Go to Step 9 Go to Step 4 3 Diagnose any other DTC codes before pro ceeding wit...

Страница 348: ...ir ing Repairs in Engine Elec trical Go to Step 7 7 Using a high impedance DVOM check for continuity between EGO 1 heater ground pin D and ECM pin 72 Do you have continuity Go to Step 8 Repair the ope...

Страница 349: ...349...

Страница 350: ...y High fuel pressure due to a faulty fuel regulator or obstructed fuel return line will cause the system to run rich Ignition noise Open or poor ground circuit to or in the ignition system or ECM wiri...

Страница 351: ...n and tight Run the fuel system diagnostic checks Was a repair made Go to Step 6 Go to Step 4 3 Diagnose any other DTC codes before pro ceeding with this chart Have any other DTC codes been detected d...

Страница 352: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the...

Страница 353: ...353...

Страница 354: ...before using the following diagnostic chat Diagnostic Aid Oxygen Sensor Wire Heated Oxygen sensor wires may be mis routed and contacting the ex haust manifold Vacuum Leaks Large vacuum leaks and cran...

Страница 355: ...e Electrical Power and Ground Distri bution Fuel System Diagnostics Refer to Fuel Sys tem Diagnostics Was a repair made Go to Step 9 Go to Step 4 3 Diagnose any other DTC codes before pro ceeding with...

Страница 356: ...ine Elec trical Go to Step 7 7 Using a high impedance DVOM check for continuity on the EGO 1 heater control circuit 162 between EGO 1 connector CN11 and ECM connector CN1 Do you have continuity Go to...

Страница 357: ...357...

Страница 358: ...multiplier This fault will set if the adaptive multiplier exceeds the limits of normal operation Always run the fuel system diagnostics before using the following diagnostic chart Diagnostic Aid Fuel...

Страница 359: ...being clean and tight Fuel system diagnostic checks Was a repair made Go to Step 6 Go to Step 4 3 Diagnose any other DTC codes before pro ceeding with this chart Have any other DTC codes been detected...

Страница 360: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the...

Страница 361: ...361...

Страница 362: ...ring active fault Closed Loop Disabled during active fault Circuit Description The catalyst monitor test is run under certain operating conditions to determine if the catalyst is functioning correctly...

Страница 363: ...r visual signs of damage leaks or modification and repair if necessary Insure the pre catalyst and post catalyst oxygen sensors are mounted correctly and wiring is not damaged melted or corroded and r...

Страница 364: ...el mixer Pressure readings are sent over the CAN to the ECM and in re turn the ECM sends back a control signal to the EPR to increase or decrease pressure for precise mixture control This code will se...

Страница 365: ...trical connector pins C018 for damage corrosion or contamina tion Did you find a problem Repair the circuit as ne cessary Refer to wire harness re pair section Go to Step 5 5 Replace or repair the EPR...

Страница 366: ...the fuel mixer Pressure readings are sent over the CAN to the ECM and in re turn the ECM sends back a control signal to the EPR to increase or decrease pressure for precise mixture control This code...

Страница 367: ...lectrical connector CN15 for damage corrosion or contamination Did you find a problem Repair the circuit as ne cessary Refer to wire harness re pair section Go to Step 5 5 Replace or repair the EPR Is...

Страница 368: ...disabled Circuit Description The EPR Electronic Pressure Regulator unit measures and controls the amount of fuel that is able to pass to the fuel mixer Pressure readings are sent over the CAN to the...

Страница 369: ...T function or check before ECM relay control times out Do you have power System bat tery voltage Go to Step 7 Go to Step 4 4 Check the fuses Is the fuse open Go to Step 5 Go to Step 6 5 Replace damage...

Страница 370: ...tep 11 Repair the open circuit as necessary Refer to wir ing repairs in engine elec trical 11 Using a DVOM check for continuity on the EPR ground circuit 181 between EPR con nector CN15 and ECM connec...

Страница 371: ...r any stored codes Does DTC1173 still re set Go to Step 16 System OK 16 Replace the ECM Is the replacement complete Go to Step 17 _ 17 Remove all test equipment except the DST Connect any disconnected...

Страница 372: ...over the CAN to the ECM and in re turn the ECM sends back a control signal to the EPR to increase or decrease pressure for precise mixture control This code will set if the EPR internal supply voltag...

Страница 373: ...two of them 1 volt Go to Step 4 Go to Step 5 4 Replace the EPR Is the replacement complete Go to Step 6 5 Replace the ECM Is the replacement complete Go to Step 6 6 Remove all test equipment except th...

Страница 374: ...e turn the ECM sends back a control signal to the EPR to increase or decrease pressure for precise mixture control This code will set if the internal EPR supply voltage is low Adaptive is disabled and...

Страница 375: ...ivate relay control ON using the DST function or check before ECM relay control times out Using a DVOM check the system battery power at the battery terminals and record the voltage reading Are the re...

Страница 376: ...CM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the engi...

Страница 377: ...377...

Страница 378: ...the amount of fuel that is able to pass to the fuel mixer Pressure readings are sent over the CAN to the ECM and in re turn the ECM sends back a control signal to the EPR to increase or decrease press...

Страница 379: ...t the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the engine within the test pa rameters of DTC1176 check f...

Страница 380: ...ount of fuel that is able to pass to the fuel mixer Pressure readings are sent over the CAN to the ECM and in re turn the ECM sends back a control signal to the EPR to increase or decrease pressure fo...

Страница 381: ...rt the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the engine within the test pa rameters of DTC1177 check...

Страница 382: ...amount of fuel that is able to pass to the fuel mixer Pressure readings are sent over the CAN to the ECM and in re turn the ECM sends back a control signal to the EPR to increase or decrease pressure...

Страница 383: ...tart the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating the engine within the test pa rameters of DTC1178 chec...

Страница 384: ...evel 2 Circuit Description The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will caus...

Страница 385: ...o Step 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect any d...

Страница 386: ...evel 2 Circuit Description The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will caus...

Страница 387: ...o Step 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect any d...

Страница 388: ...evel 2 Circuit Description The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will caus...

Страница 389: ...o Step 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect any d...

Страница 390: ...vel 2 Circuit Description The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will cause...

Страница 391: ...Step 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect any di...

Страница 392: ...te level 2 Circuit Description The ECM has several internal checks that must be satisfied each time an instruction is ex ecuted Several different things can happen within the microprocessor that will...

Страница 393: ...Go to Step 4 Repair the circuit as ne cessary Refer to Wir ing Repairs in Engine Elec trical 4 Replace ECM Is the replacement complete Go to Step 5 5 Remove all test equipment except the DST Connect a...

Страница 394: ...communicate with other digital devices used throughout the fuel system Information is sent over the CAN bus in digital infor mation packets that contain information for various control functions Indi...

Страница 395: ...epeat Step 3 until all CAN devices have been disconnected one at a time Contact the CAN device manufacturer for additional CAN address information Go to Step 4 4 Has the CAN device been replaced or ad...

Страница 396: ...on Dual throttle Position Sensors are used within the throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS 1 will read low voltage when closed and TPS...

Страница 397: ...t ECM wire harness connector CN1 Key ON Using a DVOM check for voltage between throttle connector TPS 1 signal circuit 147 and engine ground Do you have voltage Repair the circuit as ne cessary Refer...

Страница 398: ...Engine Elec trical Go to Step 12 12 Replace throttle Is the replacement complete Go to Step 13 13 Remove all test equipment except the DST Connect any disconnected components fus es etc Using the DST...

Страница 399: ...399...

Страница 400: ...uit Description Dual throttle Position Sensors are used within the throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS 1 will read low voltage when c...

Страница 401: ...greater Go to Step 4 Go to Step 8 4 Check throttle bore for foreign object Did you find a problem Go to Step 5 Go to Step 6 5 Remove the foreign object Has the object been removed Go to Step 11 6 Che...

Страница 402: ...complete Go to Step 11 11 Remove all test equipment except the DST Connect any disconnected components fus es etc Using the DST clear DTC information from the ECM Turn the ignition OFF and wait 30 se...

Страница 403: ...403...

Страница 404: ...di cates an at idle condition The two conditions conflict indicating a fault in the FPP or IVS circuits The MIL command is ON and power derate 2 is in effect during this code set limiting full power o...

Страница 405: ...CN21 Do you have continuity Repair circuit as necessary See wiring harness re pair section Go to Step 6 5 Disconnect the System Interface connector CN21 Check for continuity between circuits 154 and...

Страница 406: ...n the test pa rameters of DTC 2123 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 9 11 Remove all test equipment except the DST Connect any disco...

Страница 407: ...407...

Страница 408: ...y is on If the voltage exceeds 4 00 volts the FPP is considered to be out of specification The MIL command is ON Forced idle and low rev limit will be in effect during this code set limiting full powe...

Страница 409: ...0 200 volts 0 200 volts or less Go to Step 5 Go to Step 6 5 Replace FPP sensor Is the replacement complete Go to Step 10 6 Key OFF Disconnect ECM connector CN1 Disconnect system interface connector C...

Страница 410: ...the ECM Turn the ignition OFF and wait 30 seconds Start the engine and operate the vehicle to full operating temperature Observe the MIL Observe engine performance and driveability After operating th...

Страница 411: ...411...

Страница 412: ...n If the voltage drops below 0 300 volts the FPP is considered to be out of specification The MIL command is ON Forced idle and low rev limit will be in effect during this code set limiting full power...

Страница 413: ...Does the DST now show FPP 1 voltage above 0 300 volts Greater than 0 300 volts Go to Step 5 Go to Step 7 5 Inspect FPP 1 and CN21 connectors for damage corrosion or contamination Did you find a probl...

Страница 414: ...e wiring har ness repair section Go to Step 11 11 Replace ECM Is the replacement complete Go to Step 12 12 Remove all test equipment except the DST Connect any disconnected components fus es etc Using...

Страница 415: ...415...

Страница 416: ...Dual throttle Position Sensors are used within the throttle that use variable resistors to deter mine signal voltage based on throttle plate position TPS 1 will read low voltage when closed and TPS 2...

Страница 417: ...an 4 5 volts Go to Step 4 Repair circuit 119 as neces sary Refer to Wiring Re pairs in Engine Elec trical 4 Using a DVOM check the voltage between circuit 119 and circuit 120 at the throttle con necto...

Страница 418: ...engine performance and driveability After operating the engine within the test pa rameters of DTC 2112 check for any stored codes Does the engine operate normally with no stored codes System OK Go to...

Страница 419: ...419...

Страница 420: ...an off idle state The two conditions conflict indicating a fault in the FPP or IVS circuit The MIL command is ON and power derate level two are in effect during this code set limiting full power outpu...

Страница 421: ...heck for continuity between circuits 153 and 120 at the system interface connector CN21 Do you have continuity Repair circuit as necessary See wiring harness re pair section Go to Step 6 5 Disconnect...

Страница 422: ...After operating the engine within the test pa rameters of DTC 2123 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 9 11 Remove all test equipment...

Страница 423: ...423...

Страница 424: ...Fault Condition BP greater than 16 psia MIL On for active fault Adaptive Disabled Circuit Description The BP Barometric Pressure is estimated from the TMAP sensor The barometric pressure value is used...

Страница 425: ...MAP sensor Is the repair complete Go to Step 4 4 Remove all test equipment except the DST Connect any disconnected components fus es etc Using the DST clear DTC information from the ECM Turn the ignit...

Страница 426: ...r cranking Fault condition Adaptive dwell greater than 2 0ms or total dwell greater than 14 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers i...

Страница 427: ...FORE THE POWER RELAY CIRCUIT SHUTS DOWN Do you have voltage Go to Step 6 Repair the open power circuit See wiring har ness repairs 6 Key OFF Disconnect the ignition module connector CN6 Using a DVOM c...

Страница 428: ...of DTC 2300 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 11 11 Replace the ECM Is the replacement complete Go to Step 12 12 Remove all test equ...

Страница 429: ...429...

Страница 430: ...tion Adaptive dwell less than 2 0ms or total dwell less than 4 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers the ignition coil 1 ignition b...

Страница 431: ...1 Crank the engine Does DTC 2301 re set Go to Step 3 Intermittent problem See Intermittent problems in the electrical section 3 Key OFF Disconnect ECM connector CN1 Disconnect ignition module connecto...

Страница 432: ...des Does the engine operate normally with no stored codes System OK Go to Step 6 6 Replace the ECM Is the replacement complete Go to Step 7 7 Remove all test equipment except the DST Connect any disco...

Страница 433: ...433...

Страница 434: ...r cranking Fault condition Adaptive dwell greater than 2 0ms or total dwell greater than 14 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers i...

Страница 435: ...DOWN Do you have voltage Go to Step 6 Repair the open power circuit See wiring har ness repairs 6 Key OFF Disconnect the ignition module connector CN6 Using a DVOM check for voltage between ignition m...

Страница 436: ...es Does the engine operate normally with no stored codes System OK Go to Step 11 11 Replace the ECM Is the replacement complete Go to Step 12 12 Remove all test equipment except the DST Connect any di...

Страница 437: ...437...

Страница 438: ...tion Adaptive dwell less than 2 0ms or total dwell less than 4 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers the ignition coil 2 ignition b...

Страница 439: ...4 Crank the engine Does DTC 2304 re set Go to Step 3 Intermittent problem See Intermittent problems in the electrical section 3 Key OFF Disconnect ECM connector CN1 Disconnect ignition module connecto...

Страница 440: ...des Does the engine operate normally with no stored codes System OK Go to Step 6 6 Replace the ECM Is the replacement complete Go to Step 7 7 Remove all test equipment except the DST Connect any disco...

Страница 441: ...441...

Страница 442: ...r cranking Fault condition Adaptive dwell greater than 2 0ms or total dwell greater than 14 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers i...

Страница 443: ...FORE THE POWER RELAY CIRCUIT SHUTS DOWN Do you have voltage Go to Step 6 Repair the open power circuit See wiring har ness repairs 6 Key OFF Disconnect the ignition module connector CN6 Using a DVOM c...

Страница 444: ...of DTC 2306 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 11 11 Replace the ECM Is the replacement complete Go to Step 12 12 Remove all test equ...

Страница 445: ...445...

Страница 446: ...tion Adaptive dwell less than 2 0ms or total dwell less than 4 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers the ignition coil 1 ignition b...

Страница 447: ...Crank the engine Does DTC 2307 re set Go to Step 3 Intermittent problem See Intermittent problems in the electrical section 3 Key OFF Disconnect ECM connector CN1 Disconnect ignition module connector...

Страница 448: ...des Does the engine operate normally with no stored codes System OK Go to Step 6 6 Replace the ECM Is the replacement complete Go to Step 7 7 Remove all test equipment except the DST Connect any disco...

Страница 449: ...449...

Страница 450: ...r cranking Fault condition Adaptive dwell greater than 2 0ms or total dwell greater than 14 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers i...

Страница 451: ...FORE THE POWER RELAY CIRCUIT SHUTS DOWN Do you have voltage Go to Step 6 Repair the open power circuit See wiring har ness repairs 6 Key OFF Disconnect the ignition module connector CN6 Using a DVOM c...

Страница 452: ...of DTC 2309 check for any stored codes Does the engine operate normally with no stored codes System OK Go to Step 11 11 Replace the ECM Is the replacement complete Go to Step 12 12 Remove all test equ...

Страница 453: ...453...

Страница 454: ...tion Adaptive dwell less than 2 0ms or total dwell less than 4 0ms MIL On during active fault Adaptive Disabled Closed Loop Disabled Circuit Description The ECM triggers the ignition coil 1 ignition b...

Страница 455: ...0 Crank the engine Does DTC 2310 re set Go to Step 3 Intermittent problem See Intermittent problems in the electrical section 3 Key OFF Disconnect ECM connector CN1 Disconnect ignition module connecto...

Страница 456: ...des Does the engine operate normally with no stored codes System OK Go to Step 6 6 Replace the ECM Is the replacement complete Go to Step 7 7 Remove all test equipment except the DST Connect any disco...

Страница 457: ...457 Servicing the Fuel System...

Страница 458: ...o 7 5 Nm 5 5 ft lbs 2 Plug connector into controller 3 Push lock into place 4 Reconnect the negative battery cable 5 Install Diagnostic Service Tool 6 Start the vehicle and let run until it reaches no...

Страница 459: ...eaks at the ttings of the serviced or replaced component Use a commercially available liquid leak detector or an electronic leak detector When using both me thods use the electronic leak detector rst...

Страница 460: ...the ignition OFF and wait 30 seconds 7 Start the vehicle and let run until it reaches normal operating temperature 8 If a DTC code is found refer to the Electrical Section for further diagnosis V OIL...

Страница 461: ...the sensor threads 2 Install Engine Coolant Temperature Sensor Torque to 10 8 14 5 ft lbs 14 7 19 6 Nm 3 Refill the cooling system 4 Reconnect electrical connector 5 Reconnect the negative battery cab...

Страница 462: ...V sealant for repair procedures Silicon contamination will cause a high but false HEGO signal vol tage rich exhaust indication The ECM will then reduce the amount of fuel delivery to the engine causin...

Страница 463: ...cated Between Two Hoses as Shown Above 1 Locate the PCV connected to hoses as shown above 2 Remove the PCV 3 Insert a thin rod into the PCV against the plun ger and gently push Testing the PCV Action...

Страница 464: ...o the exhaust stream will have a white powdery coating Always be sure to eliminate the cause of contamination before replacing the sensor 2 Place the quad seals and third O ring on the neck of the Thr...

Страница 465: ...tings for leaks 7 Start the vehicle and check for leaks Let run until it reaches normal operating temperature 8 If a DTC code is found refer to the Electrical Section for further diagnosis XIII LPG FU...

Страница 466: ...hen using both methods use the electronic leak detector rst to avoid contamination by the liquid leak detector XVII ELECTRONIC PRESSURE REGULATOR EPR REMOVAL PROCEDURE 1 Disconnect the negative batter...

Страница 467: ...sensor exposed to the exhaust stream will have a white powdery coating Always be sure to eliminate the cause of contamination before replacing the sensor 6 Install the inlet and outlet water ttings Fu...

Страница 468: ...ponents for the Spectrum III EPR Do not use any other components or regulator repair kits to service the Spectrum III EPR The Kit is specifically designed for the Spectrum III EPR and is not compatibl...

Страница 469: ...ate and C clip from the primary valve pin 14 Turn the plate over and remove pin and spring Discard pin and keep the spring 15 Remove the secondary body gasket 16 Inspect the Regulator body and cover p...

Страница 470: ...ever tab into the slot of the secondary diaphragm and align the Regulator to the Ac tuator Place the Regulator on top the Actuator aligning the screw holes 14 Insert the six screws through the Actuato...

Страница 471: ...olant 6 Start engine and run until operation tempera ture is reached 7 Let engine cool and check coolant level XX SHUT OFF VALVE REPLACEMENT REMOVAL PROCEDURE 1 Disconnect the negative battery cable 2...

Страница 472: ...ing the Manifold to the bracket 8 Remove eight bolts securing the Manifold to the side of the engine and remove 9 Remove Gasket INSTALLATION PROCEDURE 1 Place bolt through Intake Manifold and Gasket a...

Страница 473: ...ng should not exceed 20 7 kPa 3 psi 5 If the back pressure at either speed exceeds speci cation a restricted exhaust system is indicated 6 Inspect the entire exhaust system for a col lapsed pipe heat...

Страница 474: ...2 Check for any DTC codes and clear 3 Verify engine is in closed loop and no MIL lights are present XXVI VACUUM LINE REMOVAL PROCEDURE 1 Disconnect the negative battery cable 2 Remove the Vacuum Line...

Страница 475: ...475 Definitions...

Страница 476: ...n to de termine air fuel ratio Adjustments are made accordingly and checked by comparing the new oxygen sensor to previous signals No stored in formation is used CNG Compressed Natural Gas CKP Cranksh...

Страница 477: ...pecific categories over a specific period of time Hydrocarbon A chemical compound made up of hydrogen and carbon HC Gasoline and almost all other fuels are hydrocarbons Hydrostatic Relief Valve A pres...

Страница 478: ...omotive fuel system that produces a signal in accordance with the oxygen content of the exhaust gas See Lambda Sen sor Oxygenate Oxygenates such as MTBE ethanol and methanol added to gasoline to incre...

Страница 479: ...sion Vehicle TMAP Combined Air Inlet and Manifold Pressure Sensor Toluene A liquid aromatic hydrocarbon C7H8 TPS Throttle Position Sensor TSB Technical Service Bulletin ULEV Ultra Low Emission Vehicle...

Страница 480: ...480...

Страница 481: ...481 TOOL KIT ACCESSORIES 1 2 3 4 5 6 7 8 9 10 11 12 13 14...

Страница 482: ...tting Assembly Test Cap System II LPR Secondary Pressure Test Adapter 1 AF4 31105 6 Fitting 1 8 NPT 3 16Hs Nip Brass 2 F4 4 7 Assembly Fitting Test Cap 3 4 1 AF4 50254 002 8 Pin Retainer 10 P1 30559 9...

Страница 483: ...483 Appendix...

Страница 484: ...13 000 58 66 8 4 9 6 12 000 61 69 8 8 10 0 11 000 64 72 9 3 10 4 10 000 66 74 9 6 10 7 9 000 69 77 10 0 11 2 8 000 71 79 10 3 11 4 7 000 74 82 10 7 11 9 6 000 77 85 11 2 12 3 5 000 80 88 11 6 12 8 4...

Страница 485: ...485 Ignition System Specifications Firing Order 1 3 4 2 Spark Plug Type Hyundai 27410 23400 NGK PFRN6N Champion RC8PYPB Spark Plug Gap 028 031 in 0 7 0 8mm...

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