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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 2.4L - DTC P0628 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Malfunction Indicator Lamp (MIL) Diagnosis >> Circuit/System Verification

Circuit/System Verification

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

Any MIL requesting DTCs that may be set should be diagnosed first.

  1. Ignition ON.
  2. Verify the parameters listed below do not display Malfunction when commanding the Malfunction Indicator Lamp On and Off with a scan tool.
    • The MIL Control Circuit Low Voltage Test Status
    • The MIL Control Circuit Open Test Status
    • The MIL Control Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing

    • If Malfunction is not displayed 
  3. Engine running.
  4. Verify the parameters listed below do not display Malfunction when commanding the Malfunction Indicator Lamp On and Off with a scan tool.
    • The MIL Control Circuit Low Voltage Test Status
    • The MIL Control Circuit Open Test Status
    • The MIL Control Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing

    • If Malfunction is not displayed 
  5. Verify the malfunction indicator lamp turns ON and OFF when commanding the Malfunction Indicator Lamp On and Off with a scan tool.
    • If the malfunction indicator lamp does not turn ON and OFF 

      Refer to Circuit/System Testing

    • If the malfunction indicator lamp turns ON and OFF 
  6. All OK.
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