P0713-TRANSMISSION TEMPERATURE SENSOR HIGH
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The Transmission Control Module (TCM) monitors the Transmission Temperature Sensor Signal circuit for voltage changes within desired limits. The TCM calculates the transmission fluid temperature from the temperature sensor signal voltage. This value is used in conjunction with various other inputs to calibrate different operating modes such as Torque Converter lock-up and Torque reduction.
The Transmission Temperature Sensor is a thermistor that changes resistive value when subject to different temperatures. When the monitored voltage rises, the calculated temperature decreases.
- When Monitored:
Ignition on engine running with battery voltage between 9.0 and 16.0 volts.
Vehicle speed greater than 10 Km/h (6 mph).
No secondary speed sensor or sensor ground DTCs present.
- Set Condition:
Indicated temperature drops below -40° C (-40° F) for the continuous period of 5.0 seconds.
| Possible Causes |
| (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE |
| (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN |
| TRANSMISSION TEMPERATURE SENSOR |
| TRANSMISSION CONTROL MODULE |
Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
Diagnostic Test
1. CHECK TO SEE IF THE DTC IS ACTIVEWith the scan tool, read Transmission DTCs.
Is the status Active or is the STARTS SINCE SET counter 2 or less for this DTC?
Yes
- Go To 2
No
- Go To 6
2. CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Ignition on, engine not running.
In the following step using the scan tool, monitor the Transmission Temperature voltage.
Jump the (T54) Transmission Temperature Sensor Signal circuit in the Transmission Solenoid/Pressure Switch Assembly harness connector to ground.
Did the Transmission Temperature voltage drop from approximately 2.5 volts to 0.0 volts?
Yes
- Replace the CV Transmission or the Transmission Temperature Sensor (Valve Body) per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Go To 3
3. CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Ignition on, engine not running.
Measure the voltage of the (T54) Transmission Temperature Sensor Signal circuit.
Is the voltage above .05 volts?
Yes
- Repair the (T54) Transmission Temperature Sensor Signal circuit for a short to voltage.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Go To 4
4. CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Measure the resistance of the (T54) Transmission Temperature Sensor Signal circuit between the TCM C2 harness connector and the Transmission Solenoid/Pressure Switch Assembly harness connector.
Is the resistance above 5.0 ohms?
Yes
- Repair the (T54) Transmission Temperature Sensor Signal circuit for an open.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Go To 5
5. CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR
| Temperature Sensor Resistive Values Chart | |
| Transmission Temperature | Resistive Value Compared to Temperature (± 10%) |
| 20° C (68° F) | 2.5k to 6.5k ohms |
| 80° C (176° F) | 0.3k to 0.9k ohms |
Reconnect all previously disconnected connectors.
Start the engine and allow to obtain normal operating temperature (approximately 10 min. of engine run time).
Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Measure the resistance between the (T54) Transmission Temperature Sensor Signal circuit and the (T13) Sensor Ground circuit in the TCM C2 harness connector.
Is the resistance within the desired range listed on the above chart?
Yes
- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Replace the Transmission Temperature Sensor (Valve Body) per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
6. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.
Were there any problems found?
Yes
- Repair as necessary.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Test Complete.