P0712
TRANSMISSION FLUID TEMPERATURE SENSOR INPUTS P0712/P0713The transmission fluid temperature sensor is a positive temperature coefficient thermistor bead, located in the internal wiring harness of the transmission assembly and immersed in the transmission fluid in the unit sump. The wiring is taken out through the transmission connector and runs through the rotary switch and then into the gearbox harness to the TCM. The pin outs on the relevant parts are as follows.
Pin Outs
TRANSMISSION FLUID TEMPERATURE SENSOR LOW INPUT - P0712
This input is continuously monitored during initialization and operation by the processor and is checked against specific limits to be in range. If the temperature indicated by the sensor is too low then this fault code will be stored and the processor will use a substitute value for the transmission oil temperature.
The low limit is approximately 5O °C. This fault would indicate that the output signal line (Pin 46) is probably short circuit to ground.
TRANSMISSION FLUID TEMPERATURE SENSOR HIGH INPUT - P0713
This input is continuously monitored during initialization and operation by the processor and is checked against specific limits to be in range. If the temperature indicated by the sensor is too high then this fault code will be stored and the processor will use a substitute value for the transmission oil temperature. The high limit is approximately 185 °C.
This fault would indicate that the input signal line (Pin 46) is probably open circuit or short circuit to battery positive voltage (+12 nominal).
Possible Causes:
Faulty sensor.
Faulty harness wiring or connection to sensor.
Effects:
Substitute oil temperature adopted by TCM.
Remedy:
Renew internal harness.
Repair or renew harness/connectors.
Troubleshooting Schematic
Key To Schematic Diagrams
1. Transmission Control Module (TCM)
2. Transmission Unit
3. TCM Multi-pin Connector
4. Transmission Rotary Switch
5. Transmission Connector Plug
6. Engine Control Module
7. Instrument Pack
8. ABS/Traction Control Control Module
9. Kickdown Switch