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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0446: Evaporative Emission (EVAP) Vent System >> Circuit/System Testing

Circuit/System Testing

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.
    3. NOTE:

    Refer to the GE41413-A  operation manual for detailed instructions in Evaporative Emission System Diagnosis .

  3. Remove the fuel fill cap and connect the CH41415-30  to the fuel tank filler neck. Connect the GE41413-A  to the CH41415-30  .
  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 GE41413-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 GE41413-A  and pressurize the fuel tank to 1.24 kPa (5.0 in H2O).
  7. Verify the scan tool Fuel Tank Pressure Sensor parameter is 0 kPa (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.

    • 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.

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