Evaporative Emissions System: Service and Repair

EVAPORATIVE EMISSION (EVAP) SYSTEM CLEANING

TOOLS REQUIRED
J 41413 EVAP Pressure and Purge Station

INSPECTION PROCEDURE

NOTE: Refer to Clean, Dry, Low Pressure Gas Source Notice in Service Precautions.

IMPORTANT: Do not perform this procedure unless instructed by an evaporative emission (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, install the EVAP canister purge valve and continue with the EVAP cleaning procedure.
- If carbon particles are found during the inspection procedure, 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 the J 41413.
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 J 41413 to its original condition.
9. Install a new EVAP canister.
10. Install a new EVAP canister purge valve.
11. Lower the vehicle.
12. Continue with the published Service Data diagnostic trouble code (DTC) procedure.