LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 514 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P219A or P219B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
  3. Read and record the Freeze Frame/Failure Records data taking note of the speed and load at which the DTC set.
  4. Diagnose any other DTCs that are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  5. Engine idling, observe the scan tool MAP Sensor Pressure parameter. The reading should be between 19-42 kPa.
  6. Inspect the air induction system for modified, damaged, leaking, or restricted components.
  7. Inspect the crankcase ventilation system for improper operation. Refer to Crankcase Ventilation System Inspection/Diagnosis .
  8. Inspect the vacuum hoses for splits, kinks, and improper connections.
  9. Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
  10. Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust .
  11. Test the fuel injectors for improper operation. Refer to Fuel Injector Diagnosis (CH47976) , Fuel Injector Diagnosis (J39021 or Scan Tool) .
  12. Test for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
  13. Test for excessive fuel in the crankcase due to leaking injectors.
  14. Test the ignition system for improper operation. Refer to Electronic Ignition System Diagnosis .
  15. Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .
scientia non olet · About LEMON Manuals