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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0446: Evaporative Emission (EVAP) Vent System Performance >> Circuit/System Testing

Circuit/System Testing

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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 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 Not Venting 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.
  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.

    • 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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