Case IH 11 – TRANS: Transmission master clutch potentiometer open circuit or short to ground.

The controller is not receiving a valid signal from the clutch pedal's position sensor, either because the wiring is broken (open circuit) or the signal wire is shorting out against the chassis/ground.

• MX Magnum
• STX Steiger
• JXC
• Magnum 235-340
• STX 450
• Maxxum
• Puma
• Farmall
• Quantum
• JXU
• JXN
• JXV
• TG210
• TG230
• TG255
• TG285
• T8.xxx Series

1. 1

   Check system voltage and battery condition, as low voltage can cause the 5V/8V sensor network to drop and trigger false faults.

2. 2

   Inspect the wiring harness from the clutch pedal potentiometer to the transmission controller for chafed wires shorting against the frame or broken wires.

3. 3

   Disconnect the potentiometer at the clutch pedal and use a multimeter to verify it is receiving the 5V to 8V reference voltage from the ECU.

4. 4

   Inspect the sensor for extreme dirt buildup or physical damage from vibration that could cause sensor drift.

1. 1

   Locate the Sensor

   Locate the master clutch potentiometer, which is mounted directly to the clutch pedal assembly in the cab.

2. 2

   Remove the Old Sensor

   Disconnect the electrical connector and unbolt the failed potentiometer from the pedal linkage.

3. 3

   Install the New Sensor

   Mount the new OEM potentiometer and reconnect the wiring harness.

4. 4

   Perform Calibration

   After replacing the sensor, you must perform a transmission clutch calibration cycle using the tractor's onboard display or a dealer diagnostic tool (like Jaltest).