The EOT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases and the resistance increases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
Removal & Installation
- Disconnect the negative battery cable.
- Disconnect the EOT sensor electrical connector.
- Unscrew the EOT sensor.
- Installation is the reverse of removal.
- Check the condition of the connector. Make sure the connector is firmly attached. Check for broken or bent connector pins. Repair any connector damage before continuing with troubleshooting the issue.
- Check the condition of the wiring to the connector. If the wiring is damaged, repair the wiring before continuing with any further tests.
- The battery should be fully charged and the starting system should be functioning properly.
- Run the engine until the engine temperature stabilizes.
- Verify the radiator hoses are hot and the cooling system is pressurized.
Check the sensor signal for a short to ground as follows:
- PCM connector disconnected.
- Measure the resistance between the positive EOT terminal on the EOT sensor connector on the harness side and the negative SIGRTN terminal on the EOT sensor connector on the harness side. The resistance should not be greater than 10 KOhms or there is a short circuit in the harness.
- Key in OFF position.
- EOT Sensor connector disconnected.
- Measure the resistance between EOT terminal on the EOT sensor connector on the component side and the negative SIGRTN terminal on the EOT sensor connector on the component side.
If the resistance is not as specified, replace the sensor.