Case IH 10091 – Transmission Controller (TRANS): Transmission Controller Failure -- Internal 5 volt supply voltage is too high.

Indicates an internal failure within the controller where the internal +5 V (or +8 V) voltage regulator is reading out of range on the high side.

• STX Steiger
• MX180
• MX200
• MX210
• MX220
• MX240
• MX270
• MX285
• TG Series
• Puma 170
• Puma 185
• Puma 200
• Puma 215
• STX / Steiger / Quadtrac Series

1. 1

   Monitor voltage using the electronic service tool (EST) MONITOR window and select 'TRANS BATTERY VOLTAGE' to observe what the controller is receiving.

2. 2

   Check the tractor's resting battery voltage to ensure it is within normal parameters (approx. 12.6V).

3. 3

   Test the alternator regulator output while the machine is running to ensure it is not overcharging and sending voltage spikes to the modules.

4. 4

   Inspect the transmission controller's main wiring harness connections for proper power and clean, secure grounds.

1. 1

   Test External Power/Ground

   Perform the diagnostic checks above. If the alternator is overcharging or grounds are loose, repair those issues first, clear the codes, and retest.

2. 2

   Replace the Controller

   If battery voltage, alternator output, and controller power/ground connections are all at correct levels, the internal 5V regulator has permanently failed. You must replace the Transmission Controller.

3. 3

   Clear Fault Codes

   Install the new controller. Before calibration can begin, you must retrieve, record, and clear any stored fault codes.

4. 4

   Calibrate the Transmission

   A newly installed transmission controller must be calibrated to the tractor.

5. 5

   Perform Calibration Steps

   Enter the 'Trans Setup Menu' on the display. The calibration process will require the tractor to be running at a specific temperature. You will need to calibrate the inching pedal (ensuring it reads in a valid range) and the transmission clutches. Follow the on-screen prompts (using the PROG and DECR keys) until the calibration is complete and the display allows you to exit.