Evaporative Emissions System: Service and Repair

EVAPORATIVE EMISSION (EVAP) SYSTEM CLEANING

TOOLS REQUIRED
J 41413-200 EVAP Pressure/Purge Diagnostic Station

INSPECTION PROCEDURE

IMPORTANT: Do not perform this procedure unless instructed by an EVAP diagnostic.

1. Turn OFF the ignition.
2. Remove the EVAP canister purge valve.
3. Lightly tap the EVAP canister purge valve on a clean hard surface.
4. Inspect for carbon particles exiting either of the vacuum ports.
- If no carbon particles are found reinstall the EVAP canister purge valve and continue with the EVAP cleaning procedure.
- If carbon particles are found during the inspection procedure, replace the EVAP canister purge valve and continue with the EVAP cleaning procedure.
- If you were instructed to replace the EVAP canister purge valve, and no carbon particles are found, return to the EVAP diagnostic procedure. Do not perform the EVAP cleaning procedure.

EVAP CLEANING PROCEDURE
1. Remove the EVAP canister.
2. Turn OFF the main valve on J 41413-200.
3. Disconnect the hose from the diagnostic station pressure regulator.
4. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator.
5. Connect the other end of the vacuum hose to the canister side of the purge pipe.
6. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
7. If the nitrogen does not dislodge the carbon particles, replace the purge pipe.
8. Return the EVAP pressure/purge diagnostic station to the stations original condition.
9. Install a new EVAP canister.
10. Connect all previously disconnected EVAP pipe connectors.
11. Lower the vehicle.
12. Continue with the published service manual diagnostic DTC procedure.