Tools Required
J 41413 EVAP Pressure/Purge
Diagnostic Station
Inspection Procedure
Whenever the DTC diagnostics lead to a no trouble found or a EVAP canister
purge solenoid valve replacement, proceed with the following EVAP canister
diagnostic.
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.
- Turn OFF the ignition.
- Remove the EVAP canister purge solenoid valve from the vehicle.
Refer to
Evaporative Emission Canister Purge Solenoid Valve Replacement
.
- Lightly tap the EVAP canister purge solenoid valve on a hard surface.
- Visually inspect for carbon particles exiting from either of the
vacuum ports.
- If no carbon particle release is evident, reinstall the solenoid,
the procedure is complete.
- If carbon particles have been released, the EVAP canister is faulty
and the purge lines must be cleared.
- Remove the EVAP canister from the vehicle. Refer to
Evaporative Emission Canister Replacement
.
- Turn OFF the main cylinder valve (1) on the J 41413
EVAP purge/pressure diagnostic station.
- Disconnect the black hose (4) that connects to the pressure
regulator valve (5) of the nitrogen cylinder (3) on the EVAP cart.
- Using a section of vacuum hose, connect one end onto the open
fitting of the pressure regulator valve (5).
- Connect the other end of the vacuum hose to the EVAP purge line
on the vehicle.
- Turn ON the main nitrogen cylinder valve (1) in order to
blow out any charcoal particles and foreign material.
- Continue to blow any debris from the purge line for 15 seconds.
- Remove the vacuum hose from the vehicle purge line and return
the J 41413
EVAP purge/pressure
diagnostic station to its original condition as in step 9.
- Install a new EVAP canister purge solenoid valve.
- Install a new EVAP canister.
- Connect the J 41413
EVAP purge/pressure diagnostic station to the vehicle and test the
EVAP system for leaks with the J 41416
Ultrasonic Leak Detector. Repair any leaks as necessary.