Actron Code Scanner CP9025 User Manual Download Page 42

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HONDA

Variable Valve Timing
Electronic Control (VTEC)
Oil Pressure switch - Bad
VTEC Oil Pressure switch,
VTEC Spool Valve or faulty
switch/valve wiring.

Knock sensor - Bad Knock
sensor or faulty sensor
wiring.

Automatic Transmission
(A/T) “A” signal - Faulty
signal wiring.

A/T FI Signal A - Faulty
signal wiring.

Automatic Transmission
(A/T) “B” signal - Faulty
signal wiring.

A/T FI Signal B - Faulty
signal wiring.

Oxygen (O

) sensor heater

- Bad Oxygen sensor or
faulty sensor wiring.

Linear Air/Fuel Ratio (LAF)
sensor - Bad LAF sensor or
faulty sensor wiring.

Fuel Supply system - Bad
Oxygen (O

) sensor or

problem in fuel system.

Linear Air/Fuel Ratio (LAF)
sensor - Bad LAF sensor or
faulty sensor wiring.

Summary of Contents for Code Scanner CP9025

Page 1: ...anner can help you determine by accessing the engine computer trouble codes Armed with that knowledge you can either refer to an appropriate service manual or discuss your problem with a knowledgeable...

Page 2: ...oke or have open flames near vehicle Vapors from gasoline and charging battery are highly flammable and explosive Always keep a fire extinguisher suitable for gasoline electrical chemical fires handy...

Page 3: ...o a vehicle service manual for additional informa tion These manuals are available from the manufacturer other publishers or your local public library See manual listing on page 4 ReadCodeswiththeCode...

Page 4: ...Injection and Feedback Carbure tors Fuel Injection and Electronic Engine Controls Emissions Control Manual or similar titles Cordura Publications Mitchell Manuals Inc Post Office Box 26260 San Diego...

Page 5: ...ook in sections called Computerized Engine Controls Electronic Engine Controls Tune Up Information or similar Whatthe CHECK EngineLight Does whenaproblemisspotted Light ON and stays ON when the engine...

Page 6: ...ill degrade engine performance Are all vacuum hoses correctly installed and in good condition Have the spark plugs spark plug wires distributor cap and rotor if used been changed according to the manu...

Page 7: ...the problem cause and fix it by doing this See Inspection Checks Be sure to erase the trouble codes from computer memory after completing repair work Refer to Erasing Trouble Codes after Repair in the...

Page 8: ...routing and connections Check electrical connectors for Corrosion on pins Bent or damaged pins Contacts not properly seated in housing Bad wire crimps to terminals Problems with connectors are common...

Page 9: ...ur instrument panel is it indicating low voltage while the engine is running Battery sulfation Internal chemical damage sulfation may occur if the battery has been sitting for several months without h...

Page 10: ...83 through most 1986 model year vehicles and vans through 1989 Rectangular plastic This is usually black or gray with 18 or 24 contacts The connector has a hinged cover labeled DIAGNO SIS DIAGNOS TIC...

Page 11: ...ckup 4Runner TCCS E 14 Cressida Supra TCCS M 20 1986 Camry Celica w 2S E Engine Corolla RWD MR2 Pickup Van 4Runner TCCS E 14 Celica w 3S GE Engine TCCS L 17 Cressida Supra TCCS M 20 1987 Corolla GT S...

Page 12: ...wire into both test connector contacts The jumper wire will not harm the vehicle engine computer 5 Get Codes from the Flashing CHECK Engine Light Count flashes to get trouble codes Only single digit...

Page 13: ...ostic circuit which needs repair before using the code scanner tools Refer to vehicle service manual Code 1 only Computer does NOT find a problem If drive symptom persists be sure to perform a thoroug...

Page 14: ...wire into both test connector contacts Service manuals refer to these as the T and E terminals The jumper wire will not harm the vehicle engine computer 5 Get Codes from the Flashing CHECK Engine Ligh...

Page 15: ...lly serviced Trouble codes indicate problems found by the computer or TEST RESULTS COMMENTS No indication on CHECK engine light You have a problem with the diagnostic circuit which needs repair before...

Page 16: ...EFI 15 amp fuse from the fuse block All the trouble codes are now erased from computer memory Replace fuse You may have to reset the vehicle clock radio stations and so on Important The computer has a...

Page 17: ...C P 9 0 2 5 Remove cap if present Circular test connector Plug the black jumper wire into both test connector contacts Service manuals refer to these as the T and E terminals The jumper wire will not...

Page 18: ...place cap 6 Turn ignition key OFF 7 Remove Tool from Connector and Replace Connector s Protective Cover The engine computer is now back to normal TEST RESULTS COMMENTS No indication on CHECK engine li...

Page 19: ...da Land Cruiser 1991 newer MR2 Paseo Pickup Previa Supra 1991 newer Tercel Van 4Runner Remove the EFI fuse from the fuse block Corolla ALL 1989 1990 Tercel Remove the STOP fuse from the fuse block 198...

Page 20: ...Seconds 6 Read Trouble Codes on Display If there are no stored trouble codes the display will show E G OK or ENG OK O F F ON O FF ON SUPER MONITOR CT INPUT SET H M SUPER MONITOR SELECT INPUT SET H M...

Page 21: ...ehicle yourself using trouble codes to help pinpoint the problem Refer to Section 3 Using Codes Be sure to erase any trouble codes from the computer s memory after repairs are completed as follows Era...

Page 22: ...ring and connectors are common especially for intermittent faults 3 Mechanical problems vacuum leaks binding or sticking linkages etc can make a good sensor send an incorrect signal to the computer Th...

Page 23: ...ed Ignition Assembly IIA Air Flow meter Fuel Injector s Cold Start Injector or Cam Position sensor Improper Fuel pressure Faulty Ignition system Distributor Wiring associated with these parts 6 Igniti...

Page 24: ...c Fuel Injection EFI relay EFI Main relay Main relay Ignition switch or faulty relay switch wiring or Switch signal Bad Air Conditioning A C switch A C Amplifier Neutral Start switch Throttle Position...

Page 25: ...in Oxygen O2 sensor signal Leak in Air Induction system Bad Spark Plugs Fuel Injector s Cold Start Injector Air Flow meter O2 sensor or O2 sensor Heater Improper Fuel pressure Faulty Distributor or Ig...

Page 26: ...g associated with these parts 28 Main Oxygen O2 sensor signal Air suction into Exhaust system Leak in Air Intake system Bad Spark Plug s Vacuum sensor O2 sensor s O2 sensor Heater Air Flow meter Fuel...

Page 27: ...wiring 52 Knock sensor signal Bad Knock sensor or faulty sensor wiring 53 Knock sensor Control Faulty Knock sensor control ECU or associated wiring or Knock Control Faulty Knock control ECU or associ...

Page 28: ...ould be repaired Refer to the vehicle service manual Some publications have this information in books or sections called Computer ized Engine Controls Electronic Engine Controls or Tune Up Information...

Page 29: ...other plastic pieces which would restrict access to the LED sight window Carefully turn back the carpeting if necessary The computer itself may have to be removed from its mounting location Make note...

Page 30: ...ment panel CHECK engine lamp for reading trouble codes do NOT require engine computer access Year Usage System Test Pg 1985 Accord SEi Civic CRX Si 4 LED 32 1986 Accord LXi Prelude all 1 LED 34 Civic...

Page 31: ...ansaxle trouble code is not eliminated then proceed with a self diagnostic check on the automatic transaxle as outlined in the vehicle service manual Some vehicles have computer controlled automatic t...

Page 32: ...ors Visually inspect vacuum hoses connectors Perform a compression test Perform an exhaust system backpressure test Perform a fuel pressure test Check curb idle speed Check ignition timing 1 Make sure...

Page 33: ...computer or Repair the vehicle yourself using trouble codes to help pinpoint the problem Refer to Section 3 Using Codes Be sure to erase any trouble codes from the computer s memory after repairs are...

Page 34: ...pect electrical wiring connectors Visually inspect vacuum hoses connectors Perform a compression test Perform an exhaust system backpressure test Perform a fuel pressure test Check curb idle speed Che...

Page 35: ...used both codes Sent as PAUSE PAUSE PAUSE PAUSE PAUSE PAUSE PAUSE Notice how the codes are grouped and the code group is repeated NOTE Some early fuel injected models typically 1986 1987 may use short...

Page 36: ...emove the negative battery cable 1988 to 1989 Accord LXi Remove the CLOCK Fuse 11 1988 to 1990 Civic CRX Remove the HAZARD Fuse 34 1988 to 1990 Prelude CARB Remove the EFI ECU Fuse 38 1988 to 1991 Pre...

Page 37: ...ector This 2 contact rectangular connector is usually light blue and is located as follows Accord 1991 1992 Above the Front Passenger s Kick Panel right of passenger s right foot close to the door Civ...

Page 38: ...Multiple Codes Depending upon system trouble codes are repeated 2 or 3 times in succession Example Code 12 Sent as PAUSE PAUSE PAUSE or PAUSE PAUSE PAUSE PAUSE PAUSE Several different codes can be sto...

Page 39: ...o help pinpoint the problem Refer to Section 3 Using Codes Be sure to erase any trouble codes from the computer s memory after repairs are completed as follows SECONDS 15 ErasingTroubleCodesafterRepai...

Page 40: ...ure Adjuster sensor or Exhaust Gas Recirculation EGR valve lift sensor Faulty Automatic Transmission A T control unit or Main relay No signal to ECU 1 Oxygen O2 sensor Bad Oxygen sensor or faulty sens...

Page 41: ...sensor or faulty sensor wiring 12 Exhaust Gas Recirculation EGR system Blocked EGR passages Bad EGR valve EGR Control Solenoid valve Constant Vacuum Control CVC valve EGR Solenoid Control valve EGR C...

Page 42: ...Faulty signal wiring or A T FI Signal A Faulty signal wiring 31 Automatic Transmission A T B signal Faulty signal wiring or A T FI Signal B Faulty signal wiring 41 Oxygen O2 sensor heater Bad Oxygen...

Page 43: ...ver in PARK or Neutral Block the drive wheels Make sure all accessories are turned OFF Make sure the ignition key is in the OFF position 2 Test the CHECK Engine Light Also called CHECK ENGINE or label...

Page 44: ...nsole 2 WD 1990 Between the Front Seats 4 WD 1990 Under Driver s Seat Stanza 1984 1986 Behind Driver s Kick Panel left of driver s left foot 1987 1989 Under Front Passenger Seat 1990 1991 Under Center...

Page 45: ...ic pieces which would restrict access to the LED sight window the test switch or potentiometer The computer itself may have to be removed from its mounting location Make note of wire harness position...

Page 46: ...vehicle 1 Find the number of LED s used 2 Read the procedure for counting flashes page 48 3 Follow the test procedure on the page listed in the chart The procedures assume you already know how to get...

Page 47: ...Pickup Van ECCS 5 2 66 Pathfinder Pickup Van ECCS 5 2 68 1988 All models except Pathfinder Pickup Van ECCS 5 2 66 Pathfinder Pickup Van ECCS 5 2 68 1989 All models except Pathfinder Pickup ECCS 5 2 6...

Page 48: ...es of the GREEN LED indicating a code 32 1 LED System HowtoCountFlashestogetTrouble Codes This system uses a single RED LED The LED blinks long flashes and short flashes The duration of the LONG flash...

Page 49: ...49 NISSAN...

Page 50: ...esults from Step 7 are satisfactory start the engine and observe the RED and GREEN LED s Vehicles with air conditioning Code 44 indicates that the computer system is O K and that testing is complete C...

Page 51: ...tery cable You may have to reset the vehicle clock radio stations etc Important The computer has a learning ability to take care of minor variations in engine control operation Whenever you erase the...

Page 52: ...rn the Diagnosis Mode Selector to the ON position 5 Have your pencil and paper ready 6 Observe the RED and GREEN LED s Codes 23 24 and 31 should be displayed Note any codes other than 23 24 and 31 O F...

Page 53: ...position 17 Remove either the harness connector from the computer ECU or the negative battery cable and wait 15 seconds Trouble codes are now erased 18 Reconnect the ECU s harness connector or the ne...

Page 54: ...osis Mode Selector to the ON position 5 Have your pencil and paper ready 6 Observe the RED and GREEN LED s Manual Transmission vehicles codes 23 24 31 and 32 should be displayed Note any codes other t...

Page 55: ...odesafterRepair 16 Verify that the Diagnosis Mode Selector is in the OFF position 17 Remove either the harness connector from the computer ECU or the negative battery cable and wait 15 seconds Trouble...

Page 56: ...ective This failure must be repaired before proceeding Refer to the vehicle service manual Some publications have this information in books or sections called Computerized Engine Controls Electronic E...

Page 57: ...d in Section 12 Nissan Code Meanings At this point you can either Have your vehicle professionally serviced Trouble codes indicate problems found by the computer or Repair the vehicle yourself using t...

Page 58: ...defective This failure must be repaired before proceeding Refer to the vehicle service manual Some publications have this information in books or sections called Computerized Engine Controls Electroni...

Page 59: ...position 19 IMPORTANT Turn the Diagnosis Mode Selector to its initial position setting as marked in Step 1 of the test procedure WhattodowiththeTroubleCodes Look up the code definitions listed in Sect...

Page 60: ...have a problem with the battery supply circuit which feeds the computer ECU or the ECU itself is defective This failure must be repaired before proceeding Refer to the vehicle service manual Some pub...

Page 61: ...le yourself using trouble codes to help pinpoint the problem Refer to Section 3 Using Codes Be sure to erase any trouble codes from the computer s memory after repairs are completed as indicated below...

Page 62: ...ECU itself is defective This failure must be repaired before proceeding Refer to the vehicle service manual Some publications have this information in books or sections called Computerized Engine Cont...

Page 63: ...itions listed in Section 12 Nissan Code Meanings At this point you can either Have your vehicle professionally serviced Trouble codes indicate problems found by the computer or Repair the vehicle your...

Page 64: ...and GREEN LED s Code 24 should be displayed Note any codes other than 24 11 For Manual Transmission only If Automatic Transmission go to Step 15 Depress the clutch and move the gear shift lever from...

Page 65: ...yourself using trouble codes to help pinpoint the problem Refer to Section 3 Using Codes Be sure to erase any trouble codes from the computer s memory after repairs are completed as follows ErasingTro...

Page 66: ...and connectors Visually inspect vacuum hoses and connectors Perform a compression test Perform an exhaust system backpressure test Perform a fuel pressure test Check curb idle speed Check ignition tim...

Page 67: ...n switch ON but do not start the engine 12 Turn the Diagnosis Mode Selector fully CLOCKWISE 13 Observe the RED and GREEN LED s They will flash sequentially 1 through 5 1 flash Mode 1 2 flashes Mode 2...

Page 68: ...hoses and connectors Perform a compression test Perform an exhaust system backpressure test Perform a fuel pressure test Check curb idle speed Check ignition timing Check computer control of air fuel...

Page 69: ...agnosis Mode Selector ON 11 Observe the RED and GREEN LED s They will flash sequentially 1 through 5 1 flash Mode 1 2 flashes Mode 2 etc 12 When Mode 3 Trouble Codes has been reached as indicated by 3...

Page 70: ...ses and connectors Perform a compression test Perform an exhaust system backpressure test Perform a fuel pressure test Check curb idle speed Check ignition timing Check computer control of air fuel mi...

Page 71: ...t the problem Refer to Section 3 Using Codes Be sure to erase any trouble codes from the computer s memory after repairs are completed as follows O FF ON ORIGINAL PENCIL MARK ErasingTroubleCodesafterR...

Page 72: ...onation sensor if code 34 also or faulty wiring associated with these parts or Ignition signal Bad Spark Plug s Ignition wires Distributor cap distributor rotor power transistor Power Transistor relay...

Page 73: ...gnition switch or faulty sensor switch wiring or Exhaust Gas sensor Bad Exhaust Gas sensor Ignition switch or faulty sensor switch wiring 34 Knock Detonation sensor Bad Detonation sensor or faulty sen...

Page 74: ...cannister etc Some early systems only controlled fuel delivery The other functions were added soon after The changes made to the basic engine to allow a computer to control these tasks are the only d...

Page 75: ...ing idle speed and emission systems The sensor information may be very important for one engine control function but only used to fine tune a second one There are several types of sensors Thermistor T...

Page 76: ...the amount of air coming in then it will look at its programming to find out how much fuel to deliver and operate the fuel injectors accordingly Computer ized engines with carburetors don t do any of...

Page 77: ...tell the computer when engine loading is about to occur Some engines have more than one such throttle air bypass Later Systems Throttle position and RPM sensors tell the computer when the vehicle is i...

Page 78: ...s combustion temperatures in the cylinders and this reduces poisonous NOx emissions The computer controls the flow of gases through the EGR valve The EGR system is only used during warm engine cruise...

Page 79: ...Intake system By Pass Control system Intake Control system and Throttle Body Air Injection Valve AIV The AIV is a one way reed valve with a lock out diaphragm When negative exhaust pressure is presen...

Page 80: ...The Check Engine light turns on to signal a problem Some vehicles display trouble codes by flashing this light Closed Loop C L This is when a control system performs an action expecting a certain res...

Page 81: ...one ignition coil for each pair of cylinders The cylinders are paired such that one is on the compression stroke while the other is on the exhaust stroke When the coil is powered spark plugs in both...

Page 82: ...sor ELD See Electric Load Detector Electric Electrical Load Detector ELD This sensor notifies the ECU of any change in load upon the electrical system of the vehicle The ECU will increase idle speed t...

Page 83: ...is 100 cycles per second or 100 Hertz Fuel Cut Solenoid Interrupts fuel delivery during deceleration if the throttle is closed and RPM is above some minimum value Used to increase fuel economy and red...

Page 84: ...utor containing the ignition coil and other ignition components Intercooler Cools the intake air after compression by the turbocharger Intermittent Failures Intermittent failures may cause the Check E...

Page 85: ...entilation PCV The PCV valve allows blow by gases from the engine s crankcase to be drawn into the intake manifold and into the air cleaner to be burned in combustion Power Transistor A heavy duty tra...

Page 86: ...ee sensors usually located within the Distributor The TDC signal determines timing while cranking and detects an abnormal crank angle signal The CRANK signal represents engine RPM The CYL signal repre...

Page 87: ...e Vehicle Speed Sensor VSV See Vacuum Switching Valve VTEC See Variable Valve Timing Electronic Control Wide Open Throttle WOT The vehicle operating condition brought about when the throttle is comple...

Page 88: ...HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE TO USE YOUR WARRANTY If you need to return the unit please follow this procedure 1 Call Actron Tech Support at 800 253 9880 Our Technical Service repre...

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