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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446-DTC P31BF And Symptoms) >> Diagnostic Information and Procedures >> DTC P0497 >> Circuit/System Verification

Circuit/System Verification

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WARNING:

Refer to Fuel and Evaporative Emission Pipe Warning .

CAUTION:

Refer to Clean, Dry, Low Pressure Gas Source Caution .

NOTE:

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

  1. Verify the following conditions do not exist in the EVAP system:
    • A loose, missing, or damaged capless fuel fill flapper doors.
    • A stuck closed, blocked, or restricted EVAP purge solenoid valve.
    • A blockage or restriction in the EVAP purge solenoid valve vacuum supply, purge vapor pipe or EVAP canister.
      • If a condition is found 

        Repair or replace as necessary.

      • Go to next step: If no conditions are found 
    2. CAUTION:

    Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution .

  2. Connect the CH-48096  to the EVAP purge solenoid valve.
  3. Connect the GE-41413-A  to CH-48096  .
  4. Disconnect the fresh air intake tube from the EVAP leak detection pump.
  5. Plug the fresh air port of the EVAP leak detection pump
  6. Engine running, observe the GE-41413-A  vacuum gauge and Fuel Tank Pressure parameter with a scan tool. There should be vacuum present.
    • If no vacuum is detected 

      Refer to Circuit System Testing

    • Go to next step: If vacuum is detected 
  7. 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 
  8. All OK.
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