P0712

P0712-TRANSMISSION TEMPERATURE SENSOR LOW

Special Tools:






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

Theory of Operation

The Transmission Temperature Sensor is a variable resistor that changes with temperature or otherwise known as a thermistor. The temperature of the transmission fluid can affect a variety of electronically controlled transmission operations such as shift quality, torque converter lock-up, and when certain OBDII or system self-diagnostic test are performed. The Powertrain Control Module (PCM) substitutes a calculated transmission temperature value if a fault is detected in the Transmission Temperature Sensor circuit.

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

- Set Condition:
The DTC will set when the monitored Temperature Sensor voltage drops below 0.078 volts for 0.45 of a second.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. CHECK IF RELATED DTCS ARE PRESENT
1. With the scan tool, read DTCs.

Are any line pressure or throttle position sensor DTCs present?

Yes

- Testing and Inspection and perform the appropriate diagnostic procedure.

No

- Go To 2

2. CHECK IF THE DTC IS CURRENT
1. With the scan tool, read DTCs.

Is the status Active or is the Starts Since Set counter 2 or less for this DTC?

Yes

- Go To 3

No

- Go To 5

3. CHECK THE TRANSMISSION TEMPERATURE SENSOR
1. Turn the ignition OFF to the LOCK position.
2. Remove the Starter Relay.

CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear.

WARNING: The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury.

NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition.

3. Install the (8333A).

NOTE: Check connectors - Clean/repair as necessary.

4. Ignition ON, Engine Not Running.
5. With the Transmission Simulator, turn the Input/Output switch to OFF.
6. With the scan tool, monitor the Transmission Temperature voltage while turning the Thermistor Voltage switch to all three positions on the Transmission Simulator.
7. Compare the scan tool readings with the numbers listed on the Transmission Simulator.

Do the readings on the Transmission Simulator match the scan tool readings ± 0.2 volts?

Yes

- Replace Transmission Solenoid/TRS Assembly. .
- Perform the 65RFE TRANSMISSION VERIFICATION TEST. 65RFE Transmission Verification Test

No

- Go To 4

4. CHECK THE (T54) TRANSMISSION TEMPERATURE SIGNAL CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition OFF to the LOCK position.
2. Disconnect the (8333A).
3. Disconnect the PCM C4 harness connector and connect the (8815A).

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (8815A) to perform diagnosis.

4. Measure the resistance between ground and the (T54) Transmission Temperature Sensor Signal circuit.

Is the resistance below 5.0 ohms?

Yes

- Repair the (T54) Transmission Temperature Signal circuit for a short to ground.
- Perform the 65RFE TRANSMISSION VERIFICATION TEST. 65RFE Transmission Verification Test.

No

- Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals 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 PCM. With the scan tool, perform a Quick Learn. Powertrain Control Module - Removal.
- Perform the 65RFE TRANSMISSION VERIFICATION TEST. 65RFE Transmission Verification Test.

5. CHECK WIRING AND CONNECTORS
1. The conditions necessary to set this 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. With the scan tool, check the Event Data to help identify the conditions in which the DTC set.

Were any problems found?

Yes

- Repair as necessary.
- Perform the 65RFE TRANSMISSION VERIFICATION TEST. 65RFE Transmission Verification Test.

No

- Test Complete.