Engine General Information and Diagnosis: 1A-176
Rough, Unstable, or Incorrect Idle and Stalling:
The
engine runs unevenly at idle. If severe, the engine or
the vehicle may shake. Engine idle may vary in
speed. Either condition may be severe enough to
stall the engine.
Surges/Chuggles:
Engine power variation under
steady throttle or cruise. Feels like the vehicle
speeds up and slows down with no change in the
accelerator pedal position.
Symptoms Verification
• The engine control module (ECM) and the malfunction
indicator lamp (MIL) are operating correctly.
• There are no DTCs stored.
• The scan tool data is within the normal operating
range.
• Bulletins are not available for the current symptom.
• The ECM grounds are clean, tight, and in the correct
locations.
• The vehicle tires are correctly inflated and meet
original equipment specifications.
• The air filter element is not restricted.
Symptoms Testing
1. Test for the following conditions:
– The fuel system for the following:
– Correct fuel pressure—Refer to “Fuel System
– Fuel injectors that are leaking or improper
operation—Refer to “Fuel Injector Balance Test
with Special Tool: ” or “Fuel Injector Balance
Test with Tech 2: ”.
– Contaminated or a poor fuel quality condition—
Refer to “Alcohol/Contaminants-in-Fuel
Diagnosis (w/o Special Tool): ” “Alcohol/
Contaminants-in-Fuel Diagnosis (w/ Special
Tool): ”.
– The ignition system for the following:
– Spark plugs for incorrect heat range or an
abnormal condition—Refer to “Spark Plug
Inspection: ”.
– For diagnosis of coolant or oil fouled spark
plugs—Refer to “Loss of Coolant: ” or “Oil
Consumption Diagnosis: ”.
– Wet down the secondary ignition system with
water from a spray bottle. Wetting down the
secondary ignition system may help locate
damaged or deteriorated components. Look/
listen for arcing or misfiring as the water is
applied.
– Weak spark using the J 26792 Spark Tester—
Refer to “Electronic Ignition (EI) System
Diagnosis: ”.
– The operation of the transmission torque
converter clutch (TCC)—The scan tool should
indicate an engine speed drop when the TCC is
commanded ON.
– The operation of the A/C compressor
– Items that can cause an engine to run lean or
rich—Refer to “DTC P2178, 2180, P2188, or
P2190”.
– The crankshaft position (CKP) sensor for the
correct resistance—The CKP sensor resistance
may be out of range after a hot soak. The
resistance should be between 700-1200 ohms.
– The engine for the following mechanical failures—
Refer to “Symptoms - Engine Mechanical: ”.
– Excessive oil in the combustion chamber or
leaking valve seals
– Incorrect cylinder compression
– Sticking or leaking valves
– Worn camshaft lobes
– Incorrect valve timing
– Broken valve springs
– Excessive carbon buildup in the combustion
chambers—Clean the chambers with top
engine cleaner. Follow the instructions on the
can.
– Incorrect engine parts
– Vacuum hoses for splits or kinks—Verify that the
routing and connections are as shown on the
Vehicle Emission Control Information label.
– Knock sensor (KS) system for excessive spark
retard activity—Refer to “Knock Sensor (KS)
System Description: ” and “DTC P0326, P0327,
P0328, P0331, P0332, or P0333”.
– The exhaust system components for the following:
– Physical damage or possible internal failure
– The three-way catalytic converters for a
restriction
For more information, refer to “Symptoms -
Engine Exhaust: ”.
– Electromagnetic interference (EMI) on the
reference circuit can cause a misfire condition.
You can usually detect EMI with a scan tool by
monitoring the engine speed parameter. A sudden
increase in the engine speed parameter with little
change in actual engine speed indicates that EMI
is present. Inspect the high voltage components
near the ignition control circuit if a condition exists.
– Inspect the positive crankcase ventilation (PCV)
system and all connections for leaks or
restrictions.
– Evaporative emission (EVAP) canister purge
solenoid that is stuck open
– The engine cooling system for the following
conditions:
Содержание 2007 XL7
Страница 1: ...SERVICE MANUAL 99500S78J00 33E 2007 JC636...
Страница 4: ......
Страница 6: ......
Страница 12: ...00 5 Precautions...
Страница 110: ...1A 5 Engine General Information and Diagnosis Module Power Ground and MIL...
Страница 111: ...Engine General Information and Diagnosis 1A 6 5 Volt Reference...
Страница 112: ...1A 7 Engine General Information and Diagnosis Low Reference...
Страница 113: ...Engine General Information and Diagnosis 1A 8 Mass Air Flow and Engine Coolant Temperature Sensor...
Страница 114: ...1A 9 Engine General Information and Diagnosis Camshaft Position Sensors and Actuators...
Страница 115: ...Engine General Information and Diagnosis 1A 10 Heated Oxygen Sensors...
Страница 116: ...1A 11 Engine General Information and Diagnosis Throttle Actuator Control and Accelerator Pedal Position Sensor...
Страница 117: ...Engine General Information and Diagnosis 1A 12 Ignition Coils...
Страница 118: ...1A 13 Engine General Information and Diagnosis Knock Sensors and Crank Sensor...
Страница 119: ...Engine General Information and Diagnosis 1A 14 Fuel Injectors and Fuel Pump...
Страница 120: ...1A 15 Engine General Information and Diagnosis Evaporative Emissions and Fuel Tank Pressure Sensor...
Страница 121: ...Engine General Information and Diagnosis 1A 16 Controlled Monitored Systems...
Страница 747: ...Engine Cooling System 1F 4 Engine Cooling Schematics...
Страница 874: ...1I 2 Starting System Starting...
Страница 875: ...Starting System 1I 3 Charging...
Страница 900: ...1J 7 Charging System Starting...
Страница 901: ...Charging System 1J 8 Charging...
Страница 1098: ...2D 34 Wheels and Tires...
Страница 1158: ...3C 2 Transfer Transfer Case Control...
Страница 1216: ...3D 29 Propeller Shafts...
Страница 1221: ...Brake Control System and Diagnosis 4A 2 Schematic and Routing Diagram...
Страница 1222: ...4A 3 Brake Control System and Diagnosis Hydraulic Brake Schematics...
Страница 1226: ...4A 7 Brake Control System and Diagnosis Park Brake Assembly 1 Park Brake Switch 3 Floor Panel 2 Park Brake Handle...
Страница 1286: ...4B 14 Front Brakes Front Brake Caliper Replacement...
Страница 1289: ...Front Brakes 4B 17 Front Disc Brake Hardware Replacement...
Страница 1316: ...4C 14 Rear Brakes Rear Brake Caliper Replacement...
Страница 1355: ...ABS 4E 5 Serial Data Traction Switch and Instrument Panel...
Страница 1356: ...4E 6 ABS Wheel Speed Sensor...
Страница 1357: ...ABS 4E 7 Yaw Rate and Lateral Accelerator Sensor and Steering Angle Sensor...
Страница 1363: ...ABS 4E 13 Near the Brake Booster 1 Brake Fluid Level Switch 3 Electronic Brake Control Module EBCM 2 LF Strut Tower...
Страница 1366: ...4E 16 ABS Rear ABS Sensors 1 Rear Cradle 3 Wheel Speed Sensor WSS RR 2 Wheel Speed Sensor WSS LR...
Страница 1406: ...4E 56 ABS...
Страница 1421: ...Automatic Transmission 5A 11 Park Engine Running...
Страница 1424: ...5A 14 Automatic Transmission Reverse...
Страница 1427: ...Automatic Transmission 5A 17 Reverse Inhibit...
Страница 1430: ...5A 20 Automatic Transmission Neutral Engine Running...
Страница 1433: ...Automatic Transmission 5A 23 Drive and M Range First Gear...
Страница 1436: ...5A 26 Automatic Transmission M Range First Gear Engine Braking...
Страница 1439: ...Automatic Transmission 5A 29 Drive and M Range Second Gear...
Страница 1442: ...5A 32 Automatic Transmission Drive and M Range Third Gear...
Страница 1445: ...Automatic Transmission 5A 35 Drive Range Fourth Gear...
Страница 1448: ...5A 38 Automatic Transmission Drive Range Fifth Gear TCC Released...
Страница 1451: ...Automatic Transmission 5A 41 Drive Range Fifth Gear TCC Applied...
Страница 1453: ...Automatic Transmission 5A 43 Drive Range Emergency Fifth Gear...
Страница 1455: ...Automatic Transmission 5A 45 Power and Ground...
Страница 1456: ...5A 46 Automatic Transmission ISS OSS and TFT Sensors...
Страница 1457: ...Automatic Transmission 5A 47 Shift and Pressure Solenoids...
Страница 1458: ...5A 48 Automatic Transmission Shift Lock Control Schematics...
Страница 1812: ...6C 30 Power Assisted Steering System...
Страница 1821: ...Heating Ventilation and Air Conditioning 7A 7 Module Power Ground Serial Data and Front Blower Controls...
Страница 1822: ...7A 8 Heating Ventilation and Air Conditioning Air Temperature Sensors Ambient Light Sensor...
Страница 1823: ...Heating Ventilation and Air Conditioning 7A 9 Mode Recirculation and Temperature Actuators...
Страница 1824: ...7A 10 Heating Ventilation and Air Conditioning Rear HVAC Controls and Actuators...
Страница 1825: ...Heating Ventilation and Air Conditioning 7A 11 A C Compressor Controls...
Страница 1989: ...Seat Belts 8A 3 Seat Belt Schematics...
Страница 2018: ...8B 6 Air Bag System SIR Schematics...
Страница 2019: ...Air Bag System 8B 7 Power Ground Roll Over Sensor and PPS...
Страница 2020: ...8B 8 Air Bag System Modules and Sensors...
Страница 2021: ...Air Bag System 8B 9 Pretensioners and Front End Sensor...
Страница 2072: ...8B 60 Air Bag System Inflatable Restraint Instrument Panel Module Replacement...
Страница 2119: ...Wiring Systems 9A 11 Capacitor Battery Variable Battery Resistor Variable Resistor OLD Symbol NEW Symbol Description...
Страница 2120: ...9A 12 Wiring Systems Position Sensor I O Resistors I O Switches Diode Heating Element OLD Symbol NEW Symbol Description...
Страница 2121: ...Wiring Systems 9A 13 Motor Solenoid Coil Antenna Twisted Wires OLD Symbol NEW Symbol Description...
Страница 2124: ...9A 16 Wiring Systems B BUS 1 of 2...
Страница 2125: ...Wiring Systems 9A 17 B BUS 2 of 2...
Страница 2126: ...9A 18 Wiring Systems ABS ABS MTR AUX PWR AWD ECMBAT PWR OUTLET REAR APO REAR HVAC and TCM BAT Fuses...
Страница 2127: ...Wiring Systems 9A 19 BATT MAIN 1 CAN VENT CLSTR HVAC BLOWER INFO INT LTS ONSTAR REAR DEFOG and RVC Fuses...
Страница 2128: ...9A 20 Wiring Systems AMP BCM CHMSL DIMR HVAC RFA and RDO Fuse...
Страница 2129: ...Wiring Systems 9A 21 AOS MODULE BATT MAIN 2 HTD SEATS L GATE LT TRN SIG PWR MIRS RT TRN SIG and SIR Fuses and...
Страница 2130: ...9A 22 Wiring Systems POWER SEATS Circuit Breaker...
Страница 2131: ...Wiring Systems 9A 23 BATT MAIN 3 DR LCK RRWPR RSE KEY CAPTR and S ROOF Fuses and POWER WNDW...
Страница 2132: ...9A 24 Wiring Systems IGN SWITCH Fuse and Ignition Switch...
Страница 2133: ...Wiring Systems 9A 25 PWR TRN BUS ETC ECM EVEN COILS INJ AND ODDCOILS INJ Fuses...
Страница 2134: ...9A 26 Wiring Systems PWR TRN BUS EMM DEV1 EMM DEV2...
Страница 2135: ...Wiring Systems 9A 27 RUN CRANK BUS MAF PCM IGN SIR DISPLAY and TRANS Fuses...
Страница 2136: ...9A 28 Wiring Systems DRL DRL2 FOG LP LH HIGH BEAM LH LOW BEAM RH HIGH BEAM and RH LOW BEAM Fuses...
Страница 2137: ...Wiring Systems 9A 29 LH PRK LP RH PRK LP and RH PRK LP TRLR Fuses...
Страница 2138: ...9A 30 Wiring Systems HORN LH TRLR STOP TURN RH TRLR STOP TURN and STOP LP Fuses...
Страница 2139: ...Wiring Systems 9A 31 Power Moding Schematics...
Страница 2140: ...9A 32 Wiring Systems Power Moding...
Страница 2141: ...Wiring Systems 9A 33 Ignition Lock Schematics...
Страница 2142: ...9A 34 Wiring Systems Ground Distribution Schematics...
Страница 2143: ...Wiring Systems 9A 35 G101...
Страница 2144: ...9A 36 Wiring Systems G103 G105 G107 G108 and G109...
Страница 2145: ...Wiring Systems 9A 37 G201...
Страница 2146: ...9A 38 Wiring Systems G203 and G205...
Страница 2147: ...Wiring Systems 9A 39 G301...
Страница 2148: ...9A 40 Wiring Systems G311...
Страница 2149: ...Wiring Systems 9A 41 G401...
Страница 2150: ...9A 42 Wiring Systems G403...
Страница 2151: ...Wiring Systems 9A 43 Trailer Connector Provision Schematics...
Страница 2152: ...9A 44 Wiring Systems Trailer Wiring...
Страница 2153: ...Wiring Systems 9A 45 Harness Routing Views Forward Lamp Harness 1 C109 4 G101 2 C110 5 C101 3 C108...
Страница 2154: ...9A 46 Wiring Systems Body Harness Engine Compartment 1 C102 2 C101...
Страница 2155: ...Wiring Systems 9A 47 Battery Cable Harness 1 C102 3 G103 2 Battery Current Sensor...
Страница 2156: ...9A 48 Wiring Systems Engine Harness Front 1 S110 5 S105 2 S109 6 S100 3 S108 7 G107 4 S107 8 C106...
Страница 2157: ...Wiring Systems 9A 49 Engine Harness Top of Engine 1 S115 3 S106 2 S114...
Страница 2158: ...9A 50 Wiring Systems Fuel Injector and Transmission Harness 1 C105 3 S101 2 S104...
Страница 2160: ...9A 52 Wiring Systems Console Harness 1 S301 3 C202 2 S300 4 C305...
Страница 2162: ...9A 54 Wiring Systems Headliner and Sunroof Harness 1 C415 3 C417 U3U 2 C412 UUC...
Страница 2165: ...Wiring Systems 9A 57 Liftgate Harness 1 C900 4 C906 2 C901 5 S908 3 S902 6 Rear WIndow Wiper Motor Connector...
Страница 2236: ...9A 128 Wiring Systems Front of the Engine Compartment 1 Fuse Block Underhood 3 Cooling Fan Left 2 Battery 4 Cooling Fan Right...
Страница 2238: ...9A 130 Wiring Systems G112 1 Rear Exhaust Manifold 2 G112...
Страница 2239: ...Wiring Systems 9A 131 G107 and G105 1 G107 3 G105 2 Front Cylinder Head 4 Starter...
Страница 2240: ...9A 132 Wiring Systems Engine Harness Rear 1 G108 2 G109...
Страница 2325: ...Lighting Systems 9B 4 Headlights Daytime Running Lights DRL Schematics...
Страница 2326: ...9B 5 Lighting Systems Fog Lights Schematics...
Страница 2327: ...Lighting Systems 9B 6 Exterior Lights Schematics...
Страница 2328: ...9B 7 Lighting Systems Left Park Lamps...
Страница 2329: ...Lighting Systems 9B 8 License Lamps Right Park Lamps...
Страница 2330: ...9B 9 Lighting Systems Turn Signal Lamps...
Страница 2331: ...Lighting Systems 9B 10 Stop Lamps...
Страница 2332: ...9B 11 Lighting Systems Backup Lamps...
Страница 2333: ...Lighting Systems 9B 12 Trailer Tow Connector...
Страница 2334: ...9B 13 Lighting Systems Interior Lights Schematics...
Страница 2335: ...Lighting Systems 9B 14 Interior Lights Dimming Schematics...
Страница 2348: ...9B 27 Lighting Systems Pedal Assemblies 1 Brake Pedal Position Sensor 2 Accelerator Pedal Position APP Sensor...
Страница 2439: ...Instrumentation Driver Info Horn 9C 8 Indicators...
Страница 2440: ...9C 9 Instrumentation Driver Info Horn Gages...
Страница 2441: ...Instrumentation Driver Info Horn 9C 10 Driver Information System Schematics...
Страница 2442: ...9C 11 Instrumentation Driver Info Horn Audible Warnings Schematics...
Страница 2443: ...Instrumentation Driver Info Horn 9C 12 Cigar Lighter Power Outlet Schematics...
Страница 2444: ...9C 13 Instrumentation Driver Info Horn Horn Schematics...
Страница 2449: ...Instrumentation Driver Info Horn 9C 18 Horn Component Views Horn Location 1 Horn...
Страница 2513: ...Wipers Washers 9D 2 Front Wiper Washer...
Страница 2514: ...9D 3 Wipers Washers Rear Wiper Washer...
Страница 2554: ...9E 6 Glass Windows Mirrors Moveable Window Schematics...
Страница 2555: ...Glass Windows Mirrors 9E 7 Defogger Schematics...
Страница 2556: ...9E 8 Glass Windows Mirrors Inside Rearview Mirror Schematics...
Страница 2557: ...Glass Windows Mirrors 9E 9 Outside Rearview Mirror Schematics...
Страница 2565: ...Glass Windows Mirrors 9E 17 Rear Window Defogger 1 Rear Defogger Grid 2 Liftgate...
Страница 2566: ...9E 18 Glass Windows Mirrors RR Door 1 Window Switch RR 3 Window Motor RR 2 Door Latch RR...
Страница 2567: ...Glass Windows Mirrors 9E 19 LR Door 1 Door Latch LR 3 Window Motor LR 2 Window Switch LR...
Страница 2570: ...9E 22 Glass Windows Mirrors Mirror Component Views Top of the Windshield 1 Inside Rearview Mirror ISRVM 2 Hood...
Страница 2627: ...Security and Locks 9F 6 Schematic and Routing Diagram Door Lock Indicator Schematics...
Страница 2628: ...9F 7 Security and Locks Door Lock Motors and Relays...
Страница 2629: ...Security and Locks 9F 8 Door Latches and Switches...
Страница 2630: ...9F 9 Security and Locks Release Systems Schematics...
Страница 2631: ...Security and Locks 9F 10 Remote Function Schematics...
Страница 2632: ...9F 11 Security and Locks Theft Deterrent System Schematics...
Страница 2633: ...Security and Locks 9F 12 Theft Deterrent...
Страница 2640: ...9F 19 Security and Locks LR Door 1 Door Latch LR 3 Window Motor LR 2 Window Switch LR...
Страница 2641: ...Security and Locks 9F 20 RR Door 1 Window Switch RR 3 Window Motor RR 2 Door Latch RR...
Страница 2643: ...Security and Locks 9F 22 Liftgate Latch Location 1 Liftgate Latch...
Страница 2689: ...Seats 9G 3 Driver Seat Schematics...
Страница 2690: ...9G 4 Seats Heated Cooled Seat Schematics...
Страница 2813: ...Sun Roof T Top Convertible Top 9I 3 Sunroof Schematics...
Страница 2955: ...Body Structure 9K 63 Body Side Opening Underbody...
Страница 2988: ...9O 7 Cellular Entertainment Navigation Audio Radio UC1...
Страница 2989: ...Cellular Entertainment Navigation Audio 9O 8 Radio U65...
Страница 2990: ...9O 9 Cellular Entertainment Navigation Audio Speaker U65...
Страница 2991: ...Cellular Entertainment Navigation Audio 9O 10 Digital Radio Receiver U2K...
Страница 2992: ...9O 11 Cellular Entertainment Navigation Audio Steering Wheel Controls...
Страница 2993: ...Cellular Entertainment Navigation Audio 9O 12 Power Ground and Video Signal...
Страница 2994: ...9O 13 Cellular Entertainment Navigation Audio Audio Signals...
Страница 2995: ...Cellular Entertainment Navigation Audio 9O 14 Steering Wheel Secondary Configurable Control Schematics...
Страница 2996: ...9O 15 Cellular Entertainment Navigation Audio Remote Radio Steering Wheel Controls UK3...
Страница 3007: ...Cellular Entertainment Navigation Audio 9O 26 Below the LR Window 1 Digital Radio Receiver U2K 3 LR Wheel Panel 2 Rear Floor...
Страница 3061: ...Cruise Control System 10A 3 Cruise Control Schematics...
Страница 3064: ...10A 6 Cruise Control System Pedal Assemblies 1 Brake Pedal Position Sensor 2 Accelerator Pedal Position APP Sensor...
Страница 3081: ...Data Communications 10B 5 Low Speed GMLAN...
Страница 3082: ...10B 6 Data Communications High Speed GMLAN...
Страница 3083: ...Data Communications 10B 7 Body Control System Schematics...
Страница 3084: ...10B 8 Data Communications Power and Ground Starting and Charging...
Страница 3085: ...Data Communications 10B 9 Exterior LIghts Radio Data Communications ABS Automatic Transmission and Ignition Lock...
Страница 3086: ...10B 10 Data Communications Shift Lock Headlights Cruise Wiper and I P...
Страница 3087: ...Data Communications 10B 11 Interior Lights Door Locks Exterior Lights Release Systems Movable Windows and Horns...
Страница 3121: ...Immobilizer Control System 10C 2 Vehicle Theft Deterrent...
Страница 3150: ...10D 13 Tire Pressure Monitoring System...
Страница 3159: ...Prepared by 1st Ed Dec 2006 3154...