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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1251

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1251



conditions that you observed from the Freeze Frame/Failure Records data.



Circuit/System Testing



1. Verify that the following conditions do not exist:



* Vacuum hose splits, kinks, and incorrect connections



* Engine vacuum leaks



* Crankcase ventilation system for vacuum leaks



* Fuel pressure that is too low or too high-Refer to Fuel System Diagnosis (LF1 China) (See: Powertrain Management/Fuel Delivery and



Air Induction/Fuel Pump/Testing and Inspection/Fuel System Diagnosis (China))Fuel System Diagnosis (LF1 Except China) (See:



Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Testing and Inspection/Fuel System Diagnosis (Except China))Fuel



System Diagnosis (LAU China) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pump/Testing and Inspection/Fuel



System Diagnosis (China))Fuel System Diagnosis (LAU Except China) (See: Powertrain Management/Fuel Delivery and Air



Induction/Fuel Pump/Testing and Inspection/Fuel System Diagnosis (Except China)).



* Contaminated Fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool) (See: Powertrain Management/Fuel Delivery and



Air Induction/Fuel/Testing and Inspection/Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool))Alcohol/Contaminants-in-Fuel



Diagnosis (Without Special Tool) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component



Tests and General Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)).



* Exhaust system restrictions



瀚慖f you find any of the above conditions, repair as necessary.



2. Ignition OFF, remove the appropriate T8 ignition coil of the misfiring cylinder, but leave the electrical connector connected.



3. Inspect the ignition coil boot for the following conditions:



* Holes



* Tears



* Carbon tracking



* Oil contamination



* water intrusion



瀚慖f you find any of the above conditions, repair as necessary.



4. Remove the fuel pump fuse from the fuse block.



5. Install the J 26792 to the boot of the appropriate T8 ignition coil and ground.



Note: An erratic or weak spark is considered a no spark condition.



6. Attempt to start the engine and observe the J 26792 . The spark tester should spark.



瀚慖f there is no spark, refer to Electronic Ignition System Diagnosis (See: Powertrain Management/Computers and Control



Systems/Testing and Inspection/Component Tests and General Diagnostics/Electronic Ignition System Diagnosis) for diagnosis of the T8



ignition coil.



7. Ignition OFF, remove the spark plug from the misfiring cylinder. Verify that the spark plug does not exhibit the following conditions:



* Gas, coolant, or oil fouled-Refer to Spark Plug Inspection (See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance



Checks/Spark Plug/Testing and Inspection).



* Cracked, worn, incorrectly gapped-Refer to Ignition System Specifications (LAU) (See: Powertrain Management/Ignition



System/Specifications)Ignition System Specifications (LF1) (See: Powertrain Management/Ignition System/Specifications).



瀚慖f there is a condition with the spark plug, replace the spark plug.



8. Exchange the suspected spark plug with another cylinder that is operating correctly.



9. Install the fuel pump fuse in the fuse block.



10. Engine idling, observe the scan tool Misfire Current Counter parameters. The misfire should not follow the spark plug exchange.



瀚慖f the misfire follows the spark plug, replace the spark plug.



11. If all conditions test normal, test or inspect for the following:



* A lean or rich Q17 fuel injector-Refer to Fuel Injector Solenoid Coil Test (LAU) (See: Powertrain Management/Fuel Delivery and Air



Induction/Fuel Injector/Testing and Inspection/Fuel Injector Solenoid Coil Test)Fuel Injector Solenoid Coil Test (LF1, LFW) (See:



Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and Inspection/Fuel Injector Solenoid Coil Test).



* An engine mechanical condition-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and



Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

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