P0711-TRANSMISSION TEMPERATURE SENSOR PERFORMANCE
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:
Condition one : Transmission in a valid forward gear.
System voltage between 9.0 and 16.0 volts.
Vehicle speed greater than 10 Km/h (6 mph).
Accelerator Pedal Position (APP) greater than 12.5%.
Engine rpm greater than 450 rpm.
Condition two: Ignition off for greater than 8 hours.
Difference between the engine coolant temperature and the intake temperature is less than 3° C (37° F).
No other temperature sensor or sensor ground DTCs present.
- Set Condition:
Condition one: No change in the Transmission oil temperature the period of 10 minutes.
Condition two: Transmission oil temperature is 40° C (104° F) different than the average temperature which consists of the combined average of the Engine Coolant temperature, Intake Temperature, Oil Temperature, and Ambient Temperature for the period of 5 seconds.
| Possible Causes |
| 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 FOR ENGINE DTCSWith the scan tool, read Engine DTCs.
Are there any Engine Temperature Sensor DTCs present?
Yes
- Refer to the Engine Diagnostic and Testing category and perform the appropriate symptom(s).
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Go To 2
2. CHECK TO SEE IF THE DTC IS ACTIVE
With the scan tool, read Transmission DTCs.
Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less?
Yes
- Go To 3
No
- Go To 7
3. IDENTIFY THE SETTING CONDITION
NOTE: The vehicle must be completely cooled for a minimum period of 8 hours for the following test procedure.
With the scan tool monitor the Transmission Temperature while test driving the vehicle.
NOTE: It may take up to 10 to 12 minutes of continuous driving to accurately test the Transmission Temperature Sensor.
Did the Transmission Temperature stay the same or increase a very limited amount?
Yes
- Go To 6
No
- Go To 4
4. CHECK THE TRANSMISSION TEMPERATURE SENSOR
Did the TCM set a one trip DTC during the previous test drive?
Yes
- Go To 5
No
- Go To 7
5. COMPARE TRANSMISSION TEMPERATURE TO OTHER TEMPERATURES
With the scan tool compare the Transmission Temperature to other Temperature sensors such as Engine Coolant, Intake, Oil Temperature.
Is the Transmission Temperature within 40° C (104° F) of the other temperatures?
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 CVT or repair the Transmission Temperature Sensor (Valve Body) per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
6. 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 |
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 CVT or repair the Transmission Temperature Sensor (Valve Body) per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
7. 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.