Tools Required

J 41413 EVAP Pressure/Purge Diagnostic Station

Whenever the DTC diagnostics lead to a no trouble found or a purge solenoid replacement, proceed with the following charcoal canister diagnostics.

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

The EVAP pressure/purge diagnostic station is required to provide a clean, dry, low pressure gas source. Do not substitute any other pressurized gas source or damage to the EVAP system may result.

1. Turn OFF the ignition.
2. Remove the EVAP canister purge valve from the vehicle. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
3. Lightly tap the EVAP canister purge valve on a clean work area.
4. Look for carbon particles existing from either of the vacuum ports.
5. If carbon is being released from either component, the EVAP canister will need replacement.
6. Remove the charcoal canister from the vehicle. Refer to Evaporative Emission Canister Replacement .
7. Turn off the main cylinder valve (1) on the EVAP purge/pressure diagnostic station.
8. Disconnect the black hose (4) that connects the nitrogen cylinder to the cart at the pressure regulator (5).
9. Using a section of the vacuum hose, connect one end onto the open fitting of the EVAP purge/pressure diagnostic station pressure regulator (5).
10. Connect the other end of the vacuum line side of the EVAP purge line at the vehicle.
11. Turn on the main nitrogen cylinder valve (1).
12. Continue to blow any debris from the purge line for 15 seconds.
13. Return the EVAP purge/pressure diagnostic station to its original condition by re-installing the black hose (4) disconnected in step 9.
14. If carbon release is found replace the EVAP canister and affected components.
15. Proceed with the published service manual diagnostics for the manifold vacuum vehicles (3.1L).