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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 P0451-P0454 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON.
  2. Verify DTC P0641, P0651, P0697, P06A3, or P06D2 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Remove the fuel cap or install GE-41415-60  for capless fuel fill, if equipped.
  4. Ignition ON, engine OFF.
  5. Verify the scan tool Fuel Tank Pressure sensor parameter is between 1.3 and 1.7 V.
    • If not between 1.3 - 1.7 V 

      Refer to Circuit/System Testing.

    • Go to next step: If between 1.3 - 1.7 V 
  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.
  7. 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 
  8. All OK.
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