Case IH F36 – Transmission Controller (TCU) / Transmission Control Module: Synchronizer Disengaged Without Driver Initiation

The transmission synchronizer has physically disengaged or lost its position without a command from the operator or the transmission controller.

• MXM
• Magnum
• Puma
• Maxxum
• T7
• TM

1. 1

   Verify the voltage and calibration of the synchronizer potentiometers (check for related codes F40-F45 indicating over-voltage, under-voltage, or out of range).

2. 2

   Check the clutch disconnect switch to ensure it does not have an open circuit (which would trigger related code F37).

3. 3

   Check the high range clutch solenoid by measuring the resistance between terminal 1 and terminal 2 (should read between 8 and 11 Ohms).

4. 4

   Verify if the transmission clutches and synchronizers have lost their calibration (related code F24 indicates all clutches and synchronizers require calibration).

1. 1

   Test the Solenoid

   Using a multimeter, test the resistance across terminal 1 and terminal 2 of the high range clutch solenoid.

2. 2

   Replace the Solenoid (if necessary)

   If the resistance indicated is not between 8 - 11 Ohms, remove and replace the high range clutch solenoid.

3. 3

   Recalibrate the Transmission

   After replacing any transmission solenoids or synchronizer components, perform a full calibration of all transmission clutches and synchronizers.

4. 4

   Clear Codes

   Clear the transmission error codes from the system. Clearing error codes without addressing the root cause or recalibrating may lead to ongoing problems.