Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EOT sensor.
- Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.
- 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, verify the scan tool EOT Sensor parameter is colder than -39°C (-38°F).
- If greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
- Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal C. verify the scan tool EOT Sensor parameter is warmer than 149°C (300°F).
- If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition OFF, disconnect the harness connectors at the ECM.
- Test for infinite of resistance between the oil temperature sensor signal circuit terminal B and the oil level switch signal circuit terminal A.
- If less than the specified range, repair the short circuit between the oil temperature sensor signal circuit and the oil level switch signal circuit.
- If all circuits test normal, replace the engine oil level sensor and/or switch assembly.
IMPORTANT:
If the 3A fuse in the jumper wire opens, the signal circuit s shorted to a voltage and the sensor may be damaged.