LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Engine Controls And Fuel - 3.6L (LGX) - Diagnostic Information And Procedures (P0010-P0446)) >> Diagnostic Information and Procedures >> DTC P0446 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0449 is not set.
    • Go to next step: If DTC P0449 is not set 
  3. Ignition/Vehicle - Off
  4. Remove the component: Fuel Tank Filler Cap or Install the special tool: GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter - Capless Type Fuel Fill
  5. Verify the scan tool parameter: Fuel Tank Pressure Sensor = Between: 1.3 to 1.7 V
    • Go to next step: If between 1.3 and 1.7 V 
  6. Install the component: Fuel Tank Filler Cap or Remove the special tool: GE-41415-60 Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter - Capless Type Fuel Fill
  7. Engine - Idling - At normal operating temperature
  8. Perform the scan tool function: EVAP Purge/Seal EVAP Purge Solenoid Valve - 50% - Perform the action while monitoring the parameter: Fuel Tank Pressure Sensor
  9. Verify the scan tool parameter: Fuel Tank Pressure Sensor = Less than 2.5 V
    • If 2.5 V or greater 

      Refer to: Circuit/System Testing

    • Go to next step: If less than 2.5 V 
  10. 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 Circuit System Testing.

    • Go to next step: If the DTC does not set 
  11. All OK.
scientia non olet · About LEMON Manuals