LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To DTC P0333) >> Diagnostic Information and Procedures >> DTC P0300-P0304: Misfire Detected >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
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.

If this a hybrid application and the hybrid battery is fully charged, the engine runs at a very low load since the hybrid battery cannot accept any additional charge. At this very low engine load, engine misfire may not be detected. It may be necessary to drive the vehicle in battery only propulsion mode in order to discharge the hybrid battery before diagnosis can be performed.

  1. If this is a hybrid application, skip to step 4.
  2. Engine Running at normal operating temperature.
  3. Verify there is no abnormal engine noise.
    • If abnormal engine noise is not present 
  4. Perform the scan tool Crankshaft Position Variation Learn procedure.
  5. Verify no DTCs are set.
    • If no DTCs are set 
  6. 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 
  7. Engine Running, perform the Cylinder Power Balance Test with a scan tool.
  8. 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 
  9. 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.
  10. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  11. All OK.
scientia non olet · About LEMON Manuals