Diagnostic Test

CHECK THE (T78) SOLENOID SUPPLY VOLTAGE CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 

Courtesy of CHRYSLER GROUP, LLC

1. Turn the ignition off to the lock position.
2. Disconnect the TCM C1 and C2 harness connectors.
3. Disconnect the Transmission Electrohydraulic Control Unit Assembly harness connector.
4. Measure the resistance between the (T78) Solenoid Supply Voltage circuit and every other circuit in the Transmission Electrohydraulic Control Unit Assembly harness connector.

   Is the resistance below 5.0 ohms between the (T78) Solenoid Supply Voltage circuit and any other circuit(s) in the Transmission Electrohydraulic Control Unit Assembly harness connector?

   Yes 

   • Repair the (T78) Solenoid Supply Voltage circuit for a short to another circuit(s).
   • Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST  .

   No 

   • 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. If no problems are found, replace the TCM per the Service Information. Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL .
   • Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST  .