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 6
CHECK (T377) OIL PRESSURE SIGNAL CIRCUIT AND (T376) 5-VOLT SUPPLY CIRCUIT OPERATION
1. Turn the Ignition OFF.
2. Disconnect the Transmission Assembly harness connector.
3. Connect a jumper between the (T377) Oil Pressure Signal Circuit and the (T376) 5-Volt Supply Circuit at the TCM harness side of the Transmission Assembly harness connector.
4. Turn the Ignition ON, Engine not running.
5. With the scan tool, view Data Display, read the Oil Pressure Sensor voltage.
  Does the Oil Pressure Sensor voltage read 5 volts?
  
  Yes
  - Replace the Transmission Oil Pressure sensor in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE (T376) 5-VOLT CIRCUIT FOR OPEN/HIGH RESISTANCE
1. Turn the Ignition OFF.
2. Disconnect the TCM harness connector.
3. Measure the resistance of the (T376) 5-Volt Supply circuit between the TCM harness connector and the Transmission Assembly harness connector.
  Is the resistance below 5 ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (T376) 5-Volt Supply circuit for an open circuit or high resistance.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (T377) OIL PRESSURE SIGNAL CIRCUIT FOR OPEN/HIGH RESISTANCE
1. Measure the resistance of (T377) Oil Pressure Signal circuit between the TCM harness connector and the Transmission Assembly harness connector.
  Is the resistance below 5 ohms?
  
  Yes
  
  Go To 5
  
  No
  - Repair the (T377) Oil Pressure Signal circuit for an open circuit or high resistance.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK (T377) OIL PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND OR ANOTHER CIRCUIT
1. Measure the resistance between the (T377) Oil Pressure Signal circuit and ground at the TCM harness connector.
2. Measure the resistance between the (T377) Oil Pressure Signal circuit and all other circuits in the TCM harness connector.
  Is there continuity between the (T377) Oil Pressure Signal circuit and ground or any other circuit?
  
  Yes
  - Repair the (T377) Oil Pressure Signal circuit for a short to ground or another circuit.
  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 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.