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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0351 - P26C8) And Symptoms) >> Diagnostic Information And Procedures >> DTC P0446: Evaporative Emission (EVAP) Vent System Performance >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON.
  2. Verify DTC P0443 is not set.
    • Go to next step: If the DTC is not set 
  3. Ignition OFF, remove the fuel tank filler cap. Ignition ON.
  4. Verify the scan tool Fuel Tank Pressure Sensor parameter is between 1.3 - 1.7 V.
    • If not between the 1.3 - 1.7 V 

      Refer to P0452, P0453 within DTC P0451-P0454 .

    • Go to next step: If between the 1.3 - 1.7 V 
  5. Install the fuel tank filler cap. Engine idling at operating temperature for 5 min.
  6. Verify the scan tool Fuel Tank Pressure Sensor parameter does not increase to greater than 2.5 V when commanding the EVAP Purge Solenoid Valve to 50%.
    • If greater than 2.5 V 

      Refer to Circuit/System Testing.

    • Go to next step: If 2.5 V or less 
  7. 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.
    • 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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