P0712

P0712-TRANSMISSION FLUID TEMPERATURE SENSOR "A" CIRCUIT LOW





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Transmission Oil Temperature Sensor is used to determine shift schedule selection. Transmission Oil Temperature is also used in TCC operation.

- When Monitored:
Continuously with the ignition on and the engine running.

- Set Condition:
The Diagnostic Trouble Code (DTC) will set if the monitored Transmission Temperature Sensor Signal circuit is greater than 200° C (392° F) for more than 10 seconds.





Always perform the AW60T Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK IF DTC IS CURRENT
1. Using the scan tool, read TCM DTCs.
2. Record the Environmental Data and any DTCs.
3. Clear DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. Read TCM DTCs.

Did the DTC reset?

Yes

- Go To 2

No

- Go To 4

2. CHECK THE TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off to the lock position.
2. Disconnect TCM harness connector and remove the TCM from the transmission.
3. Measure the resistance of the internal Output Speed sensor between ground the appropriate terminal of the TCM transmission connector.

Is the resistance above 100k Ohms?

Yes

- Go To 3

No

- Remove the Transmission Side cover and inspect the internal harness for short to ground. Service and Repair. If no short is found, replace the Transmission Temperature sensor.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

3. CHECK THE TRANSMISSION TEMPERATURE SENSOR









1. Measure the resistance of the Transmission Temperature Sensor between the Transmission Temperature Signal circuit and the Transmission Temperature Sensor Ground circuit in the appropriate terminal of the TCM transmission connector.
2. Using the chart at the chart above, compare the Temperature Sensor temperature to the correlating resistance value.

Is the resistance within the specified range when the sensor is at the given temperature?

Yes

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM. AW60T TCM Programming Procedure.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

No

- Remove the Transmission Side cover and inspect the internal harness for short to ground. Service and Repair. If no short is found, replace the Transmission Temperature sensor.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

4. CHECK WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. Check for any Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

No

- Test Complete.