Case IH 37 – Transmission ECM: Clutch Pedal Switch (1) Open Circuit

A mismatch between the clutch switch and the clutch potentiometer. The ECM logs the fault if the clutch pedal is released (switch should be closed) for 1 second, but the Clutch Pedal Potentiometer is reading above 30% travel, while the Power Shuttle FNR Lever is not in neutral. This disables the Clutch Pedal and Shuttle Lever.

• JXC
• Maxxum 5120
• Maxxum 5130
• Maxxum 5140
• Maxxum 5220
• Maxxum 5230
• Maxxum 5240
• Maxxum 5250
• Maxxum 100-150
• MXU100 through MXU135
• Farmall 75C
• Farmall 95C
• Farmall 105U
• Farmall 115U
• Puma Series

1. 1

   Check for cascading codes: Error Code 37 may be triggered by Error Code 11. Address Code 11 first if present.

2. 2

   Inspect the clutch pedal switch for an open circuit (it should close when the pedal is released).

3. 3

   Test the clutch pedal potentiometer using a multimeter or diagnostic tool to monitor the voltage sweep, ensuring it returns well below 30% when the pedal is fully released.

4. 4

   Inspect the wiring harness and connectors between the clutch pedal switch, potentiometer, and Transmission ECM (specifically ECM connector 2) for breaks, corrosion, or loose pins.

1. 1

   Park and prepare the tractor

   Park the tractor on a level surface, engage the parking brake, turn off the engine, and disconnect the battery.

2. 2

   Locate components

   Locate the clutch pedal switch and clutch pedal potentiometer assembly at the pivot point/base of the clutch pedal inside the cab.

3. 3

   Disconnect harness

   Disconnect the electrical harness from the clutch pedal switch.

4. 4

   Test and replace switch

   Using a multimeter, verify continuity across the switch terminals. If the switch fails to close the circuit when the pedal is in the released position, the switch is faulty and must be replaced.

5. 5

   Test and replace potentiometer

   If the switch functions correctly, test the potentiometer. If it has dead spots or fails to return to the correct resting voltage (causing the >30% reading), remove and replace the potentiometer.

6. 6

   Install and reconnect

   Install the new switch or potentiometer and reconnect the wiring harness.

7. 7

   Clear fault codes

   Reconnect the battery and turn the key to the ON position to clear the fault codes.

8. 8

   Calibrate transmission/clutch pedal

   Perform a transmission/clutch pedal calibration procedure. Because the ECM relies on exact voltage parameters from the potentiometer to determine clutch engagement percentages, a new sensor must be calibrated to the ECM so it learns the new 0% and 100% travel baselines.