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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Engine Controls And Fuel - 1.4L (LUJ LUV) - DTC P0300 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0506 or P0507: Idle Speed Low/High >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify no other DTCs set.
    • If no other DTC is set 
  3. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
    • If less than 90 % 
  4. Engine Idling at the normal operating temperature.
    5. NOTE:

    The engine must run for greater than 60 s, then idle at a steady state for an additional 10 s before comparing the actual and desired engine speed parameters.

  5. Verify the actual Engine Speed is not 100 RPM less than the Desired Idle Speed.
    • If 100 RPM less than the Desired Idle Speed 

      Refer to Circuit/System Testing

    • If 100 RPM greater than the Desired Idle Speed 
  6. Verify the actual Engine Speed is not 200 RPM greater than the Desired Idle Speed.
    • If 200 RPM greater than the Desired Idle Speed 

      Refer to Circuit/System Testing

    • If 200 RPM less than the Desired Idle Speed 
  7. 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.
  8. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing

    • If the DTC does not set 
  9. All OK
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