Diagnostic Test

CHECK IF DTC IS CURRENT
1. With the scan tool, read TCM DTCs.
2. Record the Environmental Data and any DTCs.
3. With the scan tool, erase 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. With the scan tool, read TCM DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2
  No
  - Go To 5
CHECK (T54) TRANSMISSION TEMPERATURE SIGNAL CIRCUIT OPERATION
1. Turn the Ignition OFF.
2. Remove the Transmission Side Cover and disconnect the Transmission Temperature Sensor harness connector.
3. Turn the Ignition ON, Engine not running.
4. Measure the voltage between (T54) Transmission Temperature Signal circuit and ground.
  Is the voltage greater than 4.8 volts?
  
  Yes
  - Go To 4
  No
  - Go To 3
CHECK (T54) TRANSMISSION TEMPERATURE SENSOR CIRCUIT FOR A SHORT TO GROUND
1. Turn the Ignition OFF.
2. Disconnect the TCM harness connector.
3. Measure the resistance of the (T54) Transmission Temperature Signal circuit between the TCM harness connector and ground.
  Is there continuity between (T54) transmission temperature signal circuit and ground?
  
  Yes
  - Repair (T54) Transmission Temperature Signal circuit for a short to ground.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  
  NOTE:
  If this Electronic Control Unit (ECU) is being replaced with a new unit, a diagnostic scan tool MUST be used to align the PROXI configuration data into the new ECU. Follow the routine outlined in the diagnostic scan tool for PROXI Configuration Alignment under Body Control Module (BCM) Miscellaneous Functions menu.
  - Using the schematics as a guide, check the Transmission Control Module (TCM) terminals and connectors for corrosion, damage or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace the TCM and perform programming and PROXI Configuration Alignment procedures. Refer to MODULE, TRANSMISSION CONTROL, REMOVAL .
  - Perform TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .

VERIFY TRANSMISSION TEMPERATURE SENSOR RESISTANCE / TEMPERATURE CORRELATION

Measure the resistance of the Transmission Temperature Sensor between the (T54) Transmission Temperature Signal terminal and the (T820) Sensor Ground terminal.

TYPICAL VALUES FOR TRANSMISSION TEMPERATURE SENSOR
TEMPERATURE	APPROXIMATE RESISTANCE
-30°C (-22°F)	44000 Ohms ± 6600
10°C (50°F)	6455 Ohms ± 645
110°C (230°F)	247 Ohms ± 16
145°C (293°F)	111 Ohms ± 6

Using 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

NOTE:

If this Electronic Control Unit (ECU) is being replaced with a new unit, a diagnostic scan tool MUST be used to align the PROXI configuration data into the new ECU. Follow the routine outlined in the diagnostic scan tool for PROXI Configuration Alignment under Body Control Module (BCM) Miscellaneous Functions menu.

Using the schematics as a guide, check the Transmission Control Module (TCM) terminals and connectors for corrosion, damage or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace the TCM and perform programming and PROXI Configuration Alignment procedures. Refer to MODULE, TRANSMISSION CONTROL, REMOVAL .
Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .

Replace the Transmission Temperature Sensor in accordance with the Service Information.
Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .

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 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.