GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Corvette 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Evaporative Emission System Cleaning

Tool Required

J 41413 EVAP Pressure/Purge Diagnostic Station

Important: Perform the EVAP System Cleaning procedure if any of the following conditions are met:

   • The DTC diagnostic tests do not uncover the cause of the complaint
   • The DTC diagnostic tests lead to an EVAP purge solenoid replacement


    Object Number: 43560 Size: SH
  1. Remove the left fuel rail cover.

    2. Object Number: 419407 Size: SH

    Notice: Use the EVAP Pressure/Purge Diagnostic Station J 41413 in order to provide a clean, dry, low pressure gas source. Do not substitute any other pressurized gas source. Damage may result to the EVAP system.

  2. Remove the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
  3. Lightly tap the EVAP canister purge solenoid on a clean work area.
  4. Look for carbon particles or carbon dust exiting from either of the vacuum ports.
    5. • Reinstall the EVAP purge solenoid if no carbon release is evident. Continue with the published service manual DTC procedures.
    • Continue with this service procedure if carbon is being released from the EVAP purge solenoid.

    Object Number: 561136 Size: SH
  5. Remove the EVAP canister from the vehicle. Refer to Evaporative Emission Canister Replacement .

    6. Object Number: 20803 Size: SH
  6. Turn off the main cylinder valve (1) on the J 41413 .
  7. Disconnect the black hose (4) that connects the nitrogen cylinder to the J 41413 cart at the pressure regulator (5) by unscrewing the knurled nut on the regulator.
  8. Connect a section of vacuum hose to the open fitting of the J 41413 pressure regulator (5).

    9. Object Number: 329579 Size: SH
  9. Disconnect the engine compartment EVAP pipe (1) at the chassis EVAP purge pipe (2)
  10. Connect the other end of the vacuum hose to the chassis EVAP purge pipe (2).
  11. Turn on the main nitrogen cylinder valve.
  12. Continue to blow any debris from the purge pipe for 15 seconds.
  13. Return the J 41413 to the original condition by re-installing the black hose disconnected in step 7.

    14. Object Number: 419407 Size: SH
  14. Replace the EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .

    15. Object Number: 561136 Size: SH
  15. Replace the EVAP canister. Refer to Evaporative Emission Canister Replacement .

    16. Object Number: 21046 Size: SH
  16. Connect the J 41413 to the vehicle EVAP service port.
  17. Turn the 4 position switch to Purge.
  18. Start the engine and idle at the normal operating temperature.
  19. Open the throttle until engine speed reaches 2000 RPM.
  20. Observe the H2O vacuum gauge on the EVAP cart. The vacuum should read greater than 15 inches H2O.
    21. • Inspect the vacuum supply to the EVAP purge solenoid valve if the vacuum is less than 15 inches H2O.
    • Continue with the published service diagnostics if the vacuum is greater than 15 inches H2O.