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Home >> GMC >> 2020 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P1176 or P1177 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter:
    • { P1176 }Fuel Pump Driver Control Module 5V Reference 1=4.8 to 5.2 V
    • { P1177 }Fuel Pump Driver Control Module 5V Reference 2=4.8 to 5.2 V
    • If not the specified value 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified value 
  3. 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.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  4. All OK.
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