Circuit/System Testing
- Ignition OFF, disconnect the pass thru multi-way harness connector X305, located on the underbody beneath the left front door.
- Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal G and ground.
- If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
- Ignition OFF, connect a test lamp between the control circuit terminal F and the ignition voltage circuit terminal G.
- Ignition ON, command the scan tool EVAP vent solenoid valve function ON and OFF. The test lamp should turn ON and OFF.
- If the test lamp remains ON all the time, test the control circuit for a short to ground. If circuit/connections test normal, replace the ECM.
- If the test lamp remains OFF all the time, test the control circuit for a short to voltage or an open/high resistance. If circuit/connections test normal, replace the ECM.
- Test for 2.6-4.6 V between the control circuit terminal F and ground.
- If not within the specified range, replace the ECM.
- Remove the fuel tank. Refer to Fuel Tank Replacement .
- Disconnect the EVAP vent solenoid valve harness connector.
- Inspect the EVAP vent solenoid valve circuits in the fuel tank harness, between the EVAP vent solenoid valve connector and X305 for the following conditions, and repair as necessary:
- Damaged wiring or terminals
- Open circuits
- Short to ground
- Wire to wire short
- If all circuits/connections test normal, test or replace the EVAP vent solenoid valve.
NOTE:
The control circuit for the EVAP vent solenoid valve is pulled-up to voltage within the ECM, 2.6-4.6 volts on the control circuit is normal.