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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 279 (Engine Controls And Fuel - 2.0L (LTG) - DTC P0300 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0451-P0454: Fuel Tank Pressure Sensor >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

This vehicle has a capless fuel fill design that requires the use of CH-44284-2  to hold the two flapper valves open.

  • Install this tool so that the raised rib nests just inside the flapper door outer lip. The flappers will hold it in place.
  • Be careful the force of the flapper doesn't push the tool back out.
  • Do not insert tool any further into the fuel neck or it may get stuck or fall into the lower fill tube.
  1. Install CH-44284-2 in the fuel fill neck.
  2. Ignition ON, engine OFF.
  3. 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

    • If between 1.3-1.7 V 
  4. 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.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  6. All OK.
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