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Home >> GMC >> 2020 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0449, P0498, or P0499 >> Circuit/System Verification

Circuit/System Verification

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

An audible click may be heard when performing step 2 below.

  1. Ignition ON.
  2. Verify the EVAP Vent Solenoid Valve control circuit status parameters do not display Malfunction while commanding the solenoid to ON (Not Venting) and OFF (Venting) with a scan tool:
    • EVAP Vent Solenoid Valve Control Circuit Open Test Status
    • EVAP Vent Solenoid Valve Control Circuit Low Voltage Test Status
    • EVAP Vent Solenoid Valve Control Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing

    • Go to next step: If Malfunction is not displayed 
  3. Verify the EVAP Vent Solenoid Valve control circuit status parameters above do not display Malfunction when moving the related harnesses and connectors of the Q13 Evaporative Emission Vent Solenoid Valve.
    • If Malfunction is displayed 

      Refer to Circuit/System Testing

    • Go to next step: If Malfunction is not displayed 
  4. 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.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing

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