Evaporative Emissions System: Service and Repair

Evaporative Emission System Cleaning

Special Tools

J 41413 EVAP Pressure and Purge Station

Inspection Procedure

Caution: Refer to Clean, Dry, Low Pressure Gas Source Caution (Clean, Dry, Low Pressure Gas Source Caution).

Note: 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. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement (Service and Repair).
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. Refer to Evaporative Emission Canister Replacement (Service and Repair).
2. Turn OFF the main valve on 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. Refer to Evaporative Emission Hoses/Pipes Replacement - Engine (Service and Repair) and to Evaporative Emission Hose/Pipe Replacement - Chassis (Service and Repair).
8. Return J 41413 to the original condition.
9. Install a new EVAP canister. Refer to Evaporative Emission Canister Replacement (Service and Repair).
10. Install a new EVAP canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement (Service and Repair).
11. Lower the vehicle.
12. Continue with the published service manual diagnostic trouble code (DTC) procedure.