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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Engine Controls And Fuel - 1.4L (LUJ LUV) - DTC P0300 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

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
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 H20.
  7. Verify the scan tool Fuel Tank Pressure Sensor parameter is 0 in H20 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 H20 
  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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