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Home >> GMC >> 2020 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0090-P0092, P00C8, P00C9, or P00CA >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function : Fuel Pressure Regulator - On and Off

    Verify the scan tool parameter :

    • Fuel Pressure Regulator Control Circuit High Voltage Test Status = OK or Not Run
    • Fuel Pressure Regulator Control Circuit Open Test Status = OK or Not Run
    • Fuel Pressure Regulator Control Circuit Low Voltage Test Status = OK or Not Run
    • Fuel Pressure Regulator High Control Circuit High Voltage Test Status = OK or Not Run
    • Fuel Pressure Regulator High Control Circuit Open Test Status = OK or Not Run
    • Fuel Pressure Regulator High Control Circuit Low Voltage Test Status = OK or Not Run
    • If not the specified state 

      Refer to : Circuit/System Testing

    • Go to next step : If the specified state 
  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.
  4. Verify the DTC does not set.
    • If the DTC sets 

      Refer to : Circuit/System Testing

    • Go to next step : If the DTC does not set 
  5. All OK.
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