Diagnostic Test

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. 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. Refer to Transmission and Transfer Case/Automatic - NAG1 - Removal
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
  No
  - Go to step 2
(T75) TCC SOLENOID CONTROL CIRCUIT SHORT TO GROUND

Fig 1: Measuring Resistance Between Ground And (T75) TCC Solenoid Control Circuit
Courtesy of CHRYSLER LLC
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 NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
  No
  - Go to step 3
(T75) TCC SOLENOID CONTROL CIRCUIT SHORT TO ANOTHER CIRCUIT

Fig 2: Measuring Resistance Between (T75) TCC Solenoid Control Circuit
Courtesy of CHRYSLER LLC
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 NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - 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 per the Service Information. Refer to Electrical - Electronic Control Modules/Electronic Control Modules/MODULE, Transmission Control - Description
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure