Evaporative Emissions System: Service and Repair

Evaporative Emission System Cleaning

Special Tools

CH-41413 - Evaporative Pressure and Purge Station

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Diagnostic Tools).

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:
Proceed with the following procedure only if referenced by an evaporative emission (EVAP) diagnostic or repair procedure.

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 hard surface.

4. Inspect for carbon particles exiting either of the vacuum ports.

* If no carbon particles were detected, but a blockage was detected during a diagnostic procedure, install the original EVAP canister purge solenoid valve. Continue with the cleaning procedure.

* If carbon particles are found during the inspection procedure, continue with the cleaning procedure.

* If a diagnostic procedure directed you to replace the EVAP canister purge solenoid valve and no carbon particles were detected, replace the EVAP canister purge solenoid valve. Return to the published service procedure.

Cleaning Procedure

1. Raise and suitable support the vehicle. Refer to Lifting and Jacking the Vehicle Service and Repair.

2. Remove the EVAP canister. Refer to Evaporative Emission Canister Replacement Service and Repair.

3. Turn OFF the main valve on the CH-41413 - station.

4. Disconnect the hose from the diagnostic station pressure regulator.

5. Using a section of vacuum hose, connect one end onto the EVAP pressure/purge diagnostic station pressure regulator.

6. Connect the other end of the vacuum hose to the canister side of the purge pipe.

7. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.

8. If the nitrogen does not clear the blockage, replace the purge pipe.

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

10. Install a NEW EVAP canister. Refer to Evaporative Emission Canister Replacement Service and Repair.

11. Lower the vehicle.

12. Install a NEW EVAP canister purge solenoid valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement Service and Repair.

13. Return to the diagnostic table that sent you here.