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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> (Transmission Control Module (TCM) - Electrical Diagnostics) >> DTC Troubleshooting >> P0742-Torque Converter Clutch Stuck On >> Diagnostic Test

Diagnostic Test

  1. CHECK IF ENGINE STALLS OR STUMBLES IN GEAR 
    1. Turn the ignition off to the lock position.
    2. Disconnect the Electrohydraulic Control Unit Assembly harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    3. Start the engine.
    4. With the brakes firmly applied, shift the gear selector into Drive.

      Did the engine stall or stumble?

      Yes 

      • Repair internal transmission in accordance with the Service Information. Pay particular attention to the components related to the TCC such as the Lockup Control Valve sticking in its bore or a leaking TCC Solenoid.
      • Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  2
  2. (T75) TCC SOLENOID CONTROL CIRCUIT SHORT TO GROUND 
    1. Turn the ignition off to the lock position.
    2. Disconnect the TCM C2 harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    3. Measure the resistance between ground and the (T75) TCC Solenoid Control circuit.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Repair the (T75) TCC Solenoid Control circuit for a short to ground.
      • Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  3
  3. (T75) TCC SOLENOID CONTROL CIRCUIT SHORT TO ANOTHER CIRCUIT 
    1. Measure the resistance between the (T75) TCC Solenoid Control circuit and all other circuits in the Transmission Electrohydraulic Control Unit Assembly harness connector.

      Is the resistance below 5.0 Ohms between the (T75) TCC Solenoid Control circuit and all other circuits in the Transmission Electrohydraulic Control Unit Assembly harness connector?

      Yes 

      • Repair the (T75) TCC Solenoid Control circuit for a short to another circuit(s).
      • Perform the NAG1 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.
      • Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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