Case IH 2369 – Transmission Control Unit (TCU / TRANS): High Range Clutch Not Calibrated

The Transmission Control Unit has lost the calibration values for the clutch pack's "bite point" or a calibration was interrupted/failed.

• Magnum
• Puma/Mid Range Magnum
• Steiger T4B
• Case IH Magnum (235-340 Series 4)
• Case IH Puma
• Case IH Steiger (STX 350-600)
• Case IH Maxxum

1. 1

   Verify transmission fluid temperature is between 60°C and 105°C (140°F - 221°F); calibration will fail or abort if the oil is too cold.

2. 2

   Ensure the tractor is parked on a flat, level surface in an open area, as the machine may lurch or move slightly during the dynamic calibration process.

3. 3

   Check the TCU for other active electrical fault codes (e.g., TRANS 111, 112, 114) which indicate open or shorted clutch solenoids. Electrical faults will cause the calibration to fail.

1. 1

   Warm transmission fluid

   Start the tractor and warm the transmission fluid to at least 60°C (140°F).

2. 2

   Prepare tractor for calibration

   Park on a flat surface, engage the parking brake, and set the engine speed to the specified calibration RPM (usually around 1200 RPM, depending on the exact model).

3. 3

   Access CONFIG MENU

   Turn the key switch OFF, then turn it to the ON position. Within 10 seconds, press and hold the Enter key on the keypad to access the CONFIG MENU.

4. 4

   Select TCU

   Use the down arrow to highlight TCU and press Enter.

5. 5

   Navigate to TRANS SETUP

   Navigate to the ETC MENU -> TRANS VIEW -> TRANS SETUP.

6. 6

   Select Clutch Calibration

   Select Cltch Cal (Clutch Calibration) and press Enter.

7. 7

   Verify oil temperature

   The screen will display Oil Deg (current oil temperature). If it is within the 60°C - 105°C range, press Enter to proceed.

8. 8

   Follow calibration prompts

   The system will prompt you to calibrate the clutches one by one (e.g., F1, R1, Mid Range, High Range).

9. 9

   Calibrate clutch

   Hold the designated calibration button (often the upshift button or auto function switch). The TCU will slowly fill the clutch pack by modulating the PWM solenoid until it detects a drop in engine RPM (the "bite point").

10. 10

    Wait for calibration value

    Once the controller calculates the correct mA required for that clutch, it will display a calibration number followed by an asterisk (*) or the word "End".

11. 11

    Save and proceed

    Press Enter to save the value and move to the next clutch.

12. 12

    Complete calibration

    Once all clutches are calibrated, the display will read Trans Cal Complete or End. Turn the key switch OFF to save the new calibration data to the TCU.

13. 13

    Inspect for mechanical failure

    If the tractor violently lunges and aborts the calibration immediately, the clutch pack or the PWM solenoid is likely mechanically failed/stuck open.