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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To DTC P0333 >> Diagnostic Information and Procedures >> DTC P0300-P0304: Engine Misfire Detected >> Circuit/System Verification

Circuit/System Verification

NOTE:

Before starting the engine, review the freeze frame failure records data to determine if the misfire sets during a cold start or at operating temperature. If there is a cold start condition and the engine is started, the engine will need to be cooled down before the next attempt to start the engine within the fail conditions.

  1. Engine Running at normal operating temperature.
  2. Verify there is no abnormal engine noise.
    • If abnormal engine noise is not present 
  3. Perform the scan tool Crankshaft Position System Variation Learn procedure.
  4. Verify no DTCs are set.
    • If no DTCs are set 
  5. Verify the scan tool Cylinder 1-4 Current Misfire Counter parameters do not increment.
    • If increments 

      Refer to Circuit/System Testing.

    • If does not increment 
  6. Engine Running, perform the Cylinder Power Balance Test with a scan tool.
  7. Verify the engine speed changes when each injector is disabled and then enabled.
    • If engine speed does not change 

      Refer to Circuit/System Testing.

    • If engine speed does change 
  8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  9. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  10. All OK.
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