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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LTG) - Diagnostic Information And Procedures (P0335 - 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.

NOTE:

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

NOTE:

The GE-41415-60  is a dual purpose tool used for EVAP testing and diesel induction leak testing. It has two positions for the rubber stopper, identified on the tube by a letter A and B. Slide the stopper to just above either line depending on the test performed.

  • Letter A position line is for diesel induction leak testing
  • Letter B position line is for EVAP 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:

    Install the GE-41415-60  , with the tube pointing toward the ground, into the capless fuel fill opening. Wedge the stopper into the opening with just enough force to retain this tools threaded end pointing out, parallel within the opening.

  3. Install the GE-41415-60  into the fuel tank filler neck. Connect the GE-41413-A to the GE-41415-60.
  4. Command the EVAP Purge/Seal function to Not Venting or System Seal with a scan tool to seal the EVAP system.
  5. Turn the nitrogen/smoke valve on the GE-41413-A to nitrogen.
    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 (1.24 kPa).
  7. Verify the scan tool Fuel Tank Pressure Sensor parameter is 0 in H20 (0 kPa) 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 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.

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