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Evaporative Emission System Cleaning

Special Tools

GE 41413 Evaporative Pressure and Purge Station

For equivalent regional tools, refer to Special Tools : Diagnostic Tools .

Caution: Use the EVAP Pressure/Purge Diagnostic Station CH 41413 in order to provide a clean, dry, low pressure gas source. Do not substitute any other pressurised gas source. Damage may result to the EVAP system.

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

1. Turn OFF the ignition.
2. Remove the evaporative canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
3. Lightly tap the evaporative canister purge 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 evaporative canister purge 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 evaporative canister purge valve and no carbon particles were detected, replace the evaporative canister purge valve. Return to the published service procedure.

1. Remove the evaporative canister. Refer to Evaporative Emission Canister Replacement .
2. Turn OFF the main valve on the GE 41413 purge station .
3. Disconnect the hose from the diagnostic station pressure regulator.
4. Using a section of vacuum hose, connect one end onto the evaporative pressure/purge 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 clear the blockage, replace the purge pipe.
8. Return the evaporative pressure/purge diagnostic station to the stations original condition.
9. Install a new evaporative canister. Refer to Evaporative Emission Canister Replacement .
10. Install a new evaporative canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
11. Return to the diagnostic table that sent you here.