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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 Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

  1. Test for a blockage or restrictions in the EVAP system components listed below and repair as necessary.
    • Evaporative Emission Vent System Hoses
    • Evaporative Emission Canister
    • Q13 Evaporative Emission Vent Solenoid Valve
    • Evaporative Emission Vent Filter
  2. Reconnect all previously disconnected EVAP hardware.
    NOTE:

    Refer to the GE-41413-A operation manual for detailed instructions in Evaporative Emission Control System Diagnosis .

  3. Remove the fuel fill cap and connect the CH-41415-30 to the fuel tank filler neck. Connect the GE-41413-A to the CH-41415-30.
  4. Command the EVAP Purge/Seal function to System Seal with a scan tool to seal the EVAP system.
  5. Turn the nitrogen/smoke valve on the GE-41413-A to nitrogen.
    6. NOTE:

    DO NOT exceed the specified value in this step. Exceeding the specified value may produce incorrect test results.

  6. Use the remote switch to activate the GE-41413-A and pressurize the fuel tank to 5.0 in H2O.
  7. Verify the scan tool Fuel Tank Pressure Sensor parameter is 0 in H2O when commanding the EVAP Vent Solenoid Valve to OFF.
    • If not 0 in H20 

      Test for a blockage or a restriction in the EVAP vent hose or inlet. If the inlet or hose test normal, replace the Q13 Evaporative Emission Vent Solenoid Valve.

    • Go to next step: If 0 in H2O 
  8. 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 step 1 above.

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