Code P0712, Transaxle Temp Sensor Low Temperature Indicated: Notes

Transaxle temperature sensor uses a thermistor to vary signal voltage to PCM according to temperature. PCM applies and monitors a 5-volt reference signal 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 68-194°F (20-90°C) transaxle temperature signal will measure about 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 about -40°F (-40°C).
• Above conditions for over 1.6 second.
  NOTE: Test numbers refer to numbers on diagnostic chart.

1. Determines if conditions necessary to set Code P0712 exist.
2. Simulates conditions to set Code P0713. If PCM recognizes low signal voltage and sets Code P0713, wiring and PCM are okay.
3. Determines if transaxle fluid temperature sensor signal circuit is open. There should be 5 volts present at sensor connector.