Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the rough road sensor.
- Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.
- Hatchback low reference circuit terminal A
- Notchback low reference circuit terminal C
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
- Hatchback 5 volt reference circuit terminal C
- Notchback 5 volt reference circuit terminal A
- If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM.
IMPORTANT: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.- If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition ON, verify the scan tool rough road sensor parameter is less than 0.1 volt.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit. Verify the scan tool rough road sensor parameter is greater than 4.8 volts.
- Hatchback 5 volt reference circuit terminal C
- Notchback 5 volt reference circuit terminal A
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
- If all circuits test normal, test or replace the rough road sensor.