Inspection Procedure
Tools Required
J 41413 EVAP Pressure/Purge Diagnostic Station
Caution: In order to reduce the risk of fire and personal injury observe the
following items:
• Replace all nylon fuel pipes that are nicked, scratched or damaged
during installation, do not attempt to repair the sections of the nylon fuel
pipes • Do not hammer directly on the fuel harness body clips when installing
new fuel pipes. Damage to the nylon pipes may result in a fuel leak. • Always cover nylon vapor pipes with a wet towel before using a
torch near them. Also, never expose the vehicle to temperatures higher than
115°C (239°F) for more than one hour, or more than 90°C (194°F)
for any extended period. • Apply a few drops of clean engine oil to the male pipe ends before
connecting fuel pipe fittings. This will ensure proper reconnection and prevent
a possible fuel leak. (During normal operation, the O-rings located in the
female connector will swell and may prevent proper reconnection if not lubricated.)
Caution: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.
Notice: Clean all of the following areas before performing any disconnections
in order to avoid possible contamination in the system:
• The fuel pipe connections • The hose connections • The areas surrounding the connections
- Turn OFF the ignition.
- Remove the EVAP canister purge valve. Refer to Evaporative Emission Canister Replacement
- Lightly tap the EVAP canister purge valve on a hard surface.
- Inspect for carbon particles exiting either of the vacuum ports.
Important: Proceed with the following procedure only if referenced by a EVAP diagnostic or repair procedure.
| • | If no carbon particles were detected, but a blockage was detected during a diagnostic procedure. Install the original EVAP canister purge valve and 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 EVAP canister purge valve and no carbon particles were detected. Replace the EVAP canister purge valve and return to the published service procedure. |
Cleaning Procedure
- Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
- Remove the EVAP canister. Refer to Evaporative Emission Canister Replacement .
- Turn OFF the main valve on the J 41413 .
- Disconnect the hose from the diagnostic station pressure regulator.
- Using a section of vacuum hose, connect one end onto the diagnostic station pressure regulator.
- Connect the other end of the vacuum hose to the canister side of the purge pipe.
- Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
- If the nitrogen does not dislodge the carbon particles, replace the purge pipe. Refer to Evaporative Emission System Hoses/Pipes Replacement .
- Return the J 41413 to its original condition.
- Install a new EVAP canister. Refer to Evaporative Emission Canister Replacement .
- Lower the vehicle.
- Install a new EVAP canister purge valve. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
- Return to the published service procedure.
