Evaporative Emissions System: Service and Repair

INSPECTION PROCEDURE

TOOLS REQUIRED
J 41413 [1][2]EVAP Pressure/Purge Diagnostic Station

Whenever the [1][2]EVAP DTC diagnostics lead to a no trouble found or an EVAP purge solenoid replacement, proceed with the following charcoal canister diagnostics.

NOTE: Use the [1][2]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 off the ignition.

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

2. Disconnect the negative battery cable.
3. Remove the EVAP purge solenoid from the vehicle.
4. Lightly tap the EVAP purge solenoid on a clean work area.
5. Look for carbon particles or carbon dust exiting from either of the vacuum ports.
6. If no carbon release is evident, reinstall the purge solenoid. Continue with the published service manual DTC procedures.
7. If carbon is released from the purge solenoid, continue with this service procedure.
8. Remove the [1][2]EVAP carbon canister from the vehicle.
9. Turn off the main cylinder valve (1) on the J 41413 [1][2]EVAP pressure/purge diagnostic station.
10. Disconnect the black hose (4) that connects the nitrogen cylinder to the cart at the pressure regulator (5) by unthreading the knurled nut on the pressure regulator.
11. Using a section of the vacuum hose, connect one end onto the open fitting of the pressure regulator (5).
12. Connect the other end of the vacuum line to the chassis purge pipe before the purge solenoid (body side).
13. Turn on the main nitrogen cylinder valve (1).
14. Continue to blow any debris from the purge line for 15 seconds.
15. Return the J 41413 to the original condition by reinstalling the black hose (4) disconnected in step 9.
16. Replace the EVAP purge solenoid and the charcoal canister with the new components.