Test Notes

NOTE: You should enter this pinpoint test only when you have been directed here from diagnostic routines.

To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault:
- Engine/transmission fluid levels
- Engine/transmission operating temperature
- Ambient temperature

This pinpoint test is intended to diagnose only the following:
- Transmission Fluid Temperature (TFT) sensor
- Harness circuits: TFT and SIG RTN
- Powertrain Control Module (PCM)





DESCRIPTION
The Transmission Fluid Temperature (TFT) sensor is a thermistor that changes resistance in response to temperature. The TFT sensor resistance decreases as the surrounding fluid temperature increases. The resistance variation is converted into a voltage signal and sent to the PCM to give an indication of the transmission fluid temperature.