Monitor description: Notes

This diagnostic code indicates that the automatic transmission fluid (ATF) temperature sensor output is abnormal and the sensor itself is defective. The ATF temperature sensor converts ATF temperature into electric resistance. TCM specifies ATF temperature based on the resistance and detects open or short circuit in the ATF temperature circuit or defects of the ATF temperature sensor.

If the vehicle drives for a certain period of time, the ATF temperature should rise. If the ATF temperature is less than 20°C and the input voltage fluctuation is 0.05 V or less after the vehicle drives for a certain period of time, TCM recognizes the defect and turns on MIL.