Circuit/System Testing
- Inspect the evaporative emission (EVAP) system for the following conditions:
- A damaged EVAP vent valve
- A collapsed or restricted EVAP vent hose/pipe (if equipped)
- A damaged EVAP canister
- If you find any of the above conditions, repair as necessary.
- Disconnect the purge line from the EVAP purge valve.
- Ignition ON, observe the fuel tank pressure sensor parameter with a scan tool. The FTP sensor parameter should be 0 inches H2O. If the pressure is not at 0 inches H2O, verify the FTP sensor voltage is less than 4.7 volts.
- If the FTP sensor voltage is greater than 4.7 volts, refer to DTC P0453 .
- Connect all previously disconnected EVAP hardware.
- Remove the fuel fill cap and connect the GE-41415-50 to the fuel tank filler neck. See Special Tools . Connect the J 41413-200 to the GE-41415-50 . See Special Tools .
- Lower the EVAP purge canister to gain access to the EVAP vent inlet, and seal it, using a suitable plug or a plug from the J 41413-300 . See Special Tools .
- Turn the nitrogen/smoke valve on the J 41413-200 to nitrogen. See Special Tools .
- Use the remote switch to activate the J 41413-200 and pressurize the fuel tank with nitrogen to 5 inches H20. See Special Tools .
- While observing the FTP sensor parameter with a scan tool, remove the EVAP vent valve plug. Verify the FTP Sensor parameter is 0 inches H2O.
- If the FTP is not at the specified range, test for a blockage or a restriction in the EVAP vent hose.
- If all hoses/pipes test OK, replace the EVAP vent solenoid valve
IMPORTANT:
Refer to the J 41413-200
Evaporative Emissions System Tester (EEST) operation manual for detailed instructions. See Special Tools
.
IMPORTANT:
DO NOT exceed the specified value in this step. Exceeding the specified value may produce incorrect test results.