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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0650, P263A Or P263B: Malfunction Indicator Lamp (MIL) Control Circuit >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  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.

    • Go to next step: 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.

    • Go to next step: 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.

    • Go to next step: If the malfunction indicator lamp turns ON and OFF 
  6. 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.
    • Go to next step: If the DTC does not set 
  7. All OK.
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