Tools Required

J 41413 , EVAP Purge/Pressure 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.

1. Turn the ignition OFF.
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 hard surface.
4. Look for carbon particles existing from either of the vacuum port, if carbon is present the canister and purge valve will need to be replaced.
5. Remove the charcoal canister from the vehicle. Refer to Evaporative Emission Canister Replacement .
6. Turn off the main cylinder valve (1) on the EVAP purge/pressure diagnostic station.
7. Disconnect the black hose (4) that connects the nitrogen cylinder to the cart at the pressure regulator (5).
8. Using a section of the vacuum hose, connect one end onto the open fitting of the pressure regulator (5).
9. Connect the other end of the vacuum line to the EVAP purge line at the vehicle.
10. Turn on the main nitrogen cylinder valve (1).
11. Continue to blow any debris from the purge line for 15 seconds.
12. Return the J 41413 to the original condition by re-installing the black hose (4) disconnected in Step 9.
13. Install all componants that were previously removed. Replace the EVAP purge solenoid and the charcoal canister with the new components if carbon release was proven.
14. Connect the EVAP diagnostic cart J 41413 to the vehicle EVAP service port. Turn the 4 position switch to Purge.
15. Start the engine. Allow the engine to reach the normal operating temperature.
16. Open the throttle until the engine speed reaches 2000 RPM.
17. Note the H2O vacuum gauge on the EVAP cart. The vacuum should be more than 15 in H2O.
18. If the vacuum is less than 15 in H2O, perform a complete throttle body service, including a cleaning of the purge ports, as outlined in the service manual. Go to Step 1.
19. If the vacuum is more than 15 in H2O, continue with the published service manual diagnostics.