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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 186 ((Transmission Control Module (TCM) - Electrical Diagnostics)) >> DTC Troubleshooting >> P1629-TCM Internal - Solenoid Supply/Watchdog >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

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

  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 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 circuit and any other circuit(s) in the Transmission Electrohydraulic Control Unit Assembly harness connector?

    Yes 

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

    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 in accordance with the Service Information. Refer to MODULE, TRANSMISSION CONTROL .
    • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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