Transmission Control Module (TCM) - AS68RC
P0711-TRANSMISSION TEMPERATURE SENSOR 1 PERFORMANCE
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. The Transmission Control Module (TCM) monitors the transmission temperature by comparing Transmission Oil Temperature to Ambient and Engine Coolant Temperature after a cold soak, by comparing Transmission Oil temperature increases in relation to Engine temperature increases, and abnormal changes over time.
Condition One:
When Monitored:
- System voltage between 10.0 and 16.0 volts.
- Engine coolant temperature data (CAN) is normal and greater than or equal to 70° C (158° F).
- Engine coolant temperature increase is greater than 50° C (90° F).
- Output speed sensor greater than 300 rpm for 410 sec.
- Start up transmission oil temperature is between -40° C and 40° C (-40° F and 104° F).
- No Output Speed Sensor errors are detected.
Set Condition:
- Change in Transmission Oil Temperature is less than or equal to 2° C (4° F).
Condition Two:
When Monitored:
- System voltage between 10.0 and 16.0 volts.
- Engine coolant temperature data and output speed sensor is normal.
- Output speed sensor greater than 300 rpm for 410 seconds.
Set Condition:
- Change in transmission oil temperature is greater than 20° C (36° F) in 100 msec and transmission oil temperature is less than 70° C (158° F) for more than five seconds.
Condition Three:
When Monitored:
- Ambient temperature is less than 43° C (109° F)
- Engine coolant temp is equal to Ambient temperature within ± 10° C (18° F)
Set Condition:
- Transmission oil temperature is greater than Engine Ambient temperature by a calibrated value (see chart below).
Condition Four:
When Monitored:
- Transmission oil temperature is less than or equal to 20° C (68° F) at Ignition on.
Set Condition:
- Transmission oil temperature is less than 20° C (68° F) after a calibrated time (see chart below).
Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. AS68RC Pre-Diagnostic Troubleshooting Procedure
1. CHECK FOR RELATED ENGINE DTCs
1. With the scan tool, view Engine DTCs.
Are there any Engine Coolant and/or Ambient DTCs present?
Yes
- Testing and Inspection Perform the appropriate diagnostic procedure.
No
- Go To 2
2. CHECK FOR RELATED TRANSMISSION DTCs
1. With the scan tool, view Transmission DTCs.
2. Record any Transmission Freeze Frame data.
Are there any other Transmission temperature sensor DTCs?
Yes
- Perform the appropriate diagnostic procedure.
No
- Go To 3
3. 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 4
No
- Go To 9
4. COMPARE THE TRANSMISSION TEMPERATURE TO ENGINE COOLANT TEMPERATURE
NOTE: To test the transmission temperature sensor, the engine and transmission temperature must be at or below 29.4° C (85° F).
1. With the scan tool, read the Transmission and Engine temperatures.
Is the transmission temperature within 5° C (9° F) of the engine coolant temperature?
Yes
- Go To 5
No
- Go To 8
5. CHECK IF THE TRANSMISSION TEMPERATURE INCREASES 15 DEGREES OVER 10 MINUTE PERIOD
NOTE: To test the transmission temperature sensor, the engine and transmission temperature must be at or below 29.4° C (85° F).
CAUTION: Apply the parking brake.
1. Start the engine, firmly apply the brakes and allow the engine to idle in Drive.
2. With the scan tool, monitor the Transmission Temperature.
NOTE: If the transmission temperature sensor is working properly, the transmission temperature should rise at least 8° C (15° F) within a ten minute period.
3.
Did the transmission temperature increase at a steady rate and rise at least 8° C (15° F) over a 10 minute period?
Yes
- Go To 9
No
- Go To 6
6. CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT
1. Turn the ignition off to the lock position.
2. Disconnect the Transmission Solenoid Assembly C1 harness connector.
NOTE: Check connectors - Clean/repair as necessary.
3. Ignition on, engine not running.
4. With the scan tool, monitor the Transmission Oil Temperature.
Does the Transmission Oil Temperature read -40° C (-40° F) ± 2° C (4° F)?
Yes
- Go To 7
No
- Perform P0713-TRANSMISSION TEMPERATURE SENSOR 1 HIGH as if the DTC is active.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.
7. CHECK THE (T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off to the lock position.
2. Connect a jumper wire between the (T54) Transmission Temperature Signal circuit and the (T820) Sensor Ground circuit in the Transmission Solenoid Assembly C1 harness connector.
3. Ignition on, engine not running.
4. With the scan tool, monitor the Transmission Oil Temperature.
Does the Transmission Oil Temperature read 200° C (392° F) ± 2° C (4° F)?
Yes
- Go To 8
No
- Perform the diagnostic procedure for P0712-TRANSMISSION TEMPERATURE SENSOR 1 LOW as if the DTC is active.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.
8. CHECK THE TRANSMISSION TEMPERATURE SENSOR
1. Turn the ignition off to the lock position.
2. Reconnect the Transmission Solenoid harness connector.
3. Disconnect the TCM C2 and C3 harness connectors.
NOTE: Check connectors - Clean/repair as necessary
4. Measure the resistance of the Transmission Temperature Sensor between the (T54) Transmission Temperature Signal circuit in the TCM C2 harness connector and the (T820) Sensor Ground circuit in the TCM C3 harness connector.
5. 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
- Go To 9
No
- Remove the Transmission Oil Pan and inspect the internal Transmission harness, pins, terminals, and connectors for corrosion, damage, or terminal push out. If no problems are found, replace the Transmission Temperature Sensor.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.
9. 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 AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.
No
- Test Complete.