Code P0712, Transaxle Temp Sensor Low Temp Indicated: Notes

Transaxle temperature sensor uses a thermistor to vary signal voltage to PCM according to temperature. PCM applies and monitors a voltage to sensor. When transaxle fluid is cold sensor resistance is high. Thus, PCM will monitor a high signal voltage. As transaxle fluid warms, sensor resistance becomes less and voltage drops. At normal operating temperature of 68°F-194°F (20°C-90°C) transaxle temperature signal will measure approximately 2-4 volts.

Code P0712 will set when the following conditions are present.

Engine run time is over 2 minutes.
Transaxle temperature sensor signal indicates a temperature less than -40°F (-40°C).
Above conditions for over 1.6 second.

With Code P0712 set, PCM will substitute coolant sensor temperature value for transaxle temperature. Tech 1 will continue to display actual transaxle sensor value. Code P0712 does not illuminate the Malfunction Indicator Light (MIL).

NOTE: Test numbers refer to numbers on diagnostic chart.

Determines if conditions necessary to set Code P0712 exist.
Simulates conditions to set Code P0713. If PCM recognizes low signal voltage and sets Code P0713, wiring and PCM are okay.