Transmission Temperature Sensor/Switch: Description and Operation

Operation

The transmission fluid temperature sensor is integrated into the internal harness within the fluid pan.

It should be noted that this component is not serviceable, necessitating the renewal of the internal harness should a fault occur.

Following engine start-up, if the fluid temperature is < 20°C and does not increase by 10°C after 180 seconds, a failure judgment is made. A similar judgment is made should the temperature change by more than 5°C in < 100 milliseconds. The MIL is illuminated if the failure judgment is made on two successive trips.

Sensor output is continuously monitored for out of range values. If a sustained high, or low input is sensed, indicating a harness or connector fault, a failure judgment is made.





Location of Sensor Within The Harness





Temperature/Resistance Relationship Chart