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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0010 - P034B)) >> Diagnostic Information And Procedures >> DTC P0171 Or P0172: Fuel Trim System >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON.
  2. Verify no other DTCs are set.
    • Go to next step: If no other DTCs are set 
  3. Verify DTC P0171 or P0172 is not set.
    • If a DTC is set 

      Refer to Circuit/System Testing.

    • Go to next step: If no DTC is set 
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
  5. Verify DTC P0171 or P0172 is not set.
    • If any of the DTCs set 

      Refer to Circuit/System Testing.

    • Go to next step: If none of the DTCs set 
  6. All OK.
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