Evaporative Emissions System: Service and Repair

Evaporative Emission System Cleaning

Special Tools

J 41413 EVAP Pressure/Purge Diagnostic Station

Inspection Procedure

Caution:
Use the Evaporative Emission (EVAP) System Tester (EEST) GE 41413-A in order to provide a clean, dry, low pressure nitrogen gas source. Do not substitute any other pressurized source, gas or otherwise. Damage may result to the EVAP system, test equipment or cause a safety risk.

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 solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement Service and Repair.

3. Lightly tap the EVAP canister purge solenoid 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 solenoid valve and continue with the EVAP cleaning procedure. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement Service and Repair.

* If carbon particles are found during the inspection procedure, replace the EVAP canister purge solenoid valve and continue with the EVAP cleaning procedure. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement Service and Repair.

* If you were instructed to replace the EVAP canister purge solenoid 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 (Passenger/Cargo Van) Evaporative Emission Canister Replacement (Passenger/Cargo Van)Evaporative Emission Canister Replacement (Cutaway Van) Evaporative Emission Canister Replacement (Cutaway Van).

2. Turn OFF the main valve on the J 41413 EVAP pressure/purge diagnostic station.

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 System Hose/Pipe Replacement Evaporative Emission System Hose/Pipe Replacement.

8. Return the EVAP pressure/purge diagnostic station to the stations original condition.

9. Install a new EVAP canister. Refer to Evaporative Emission Canister Replacement (Passenger/Cargo Van) Evaporative Emission Canister Replacement (Passenger/Cargo Van)Evaporative Emission Canister Replacement (Cutaway Van) Evaporative Emission Canister Replacement (Cutaway Van).

10. Connect all previously disconnected EVAP pipe connectors.

11. Lower the vehicle.

12. Continue with the published service manual diagnostic DTC procedure.