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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 167 (Engine Controls And Fuel - 3.6L (LGX LF4) - DTC P0650 To DTC P3436 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 car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
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 MIL On and Off with a scan tool.
    • MIL Control Circuit Low Voltage Test Status
    • MIL Control Circuit Open Test Status
    • 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 MIL On and Off with a scan tool.
    • MIL Control Circuit Low Voltage Test Status
    • MIL Control Circuit Open Test Status
    • 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 MIL On and Off with a scan tool.
    • If the MIL does not turn ON and OFF 

      Refer to Circuit/System Testing

    • If the MIL turns ON and OFF 
  6. All OK.
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