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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Controls And Fuel - 2.4L - DTC P0114 To DTC P0604) >> Diagnostic Information and Procedures >> DTC P0449, P0498, or P0499: Evaporative Emission (EVAP) Vent Solenoid Valve >> 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. Command the EVAP Vent Solenoid Valve to ON (Not Venting) and OFF (Venting) with a scan tool while observing the following control circuit status parameters:
    • 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

    • If Malfunction is not displayed 
  3. Verify the EVAP Vent Solenoid Valve Control Circuit 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

    • 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

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