Massey Ferguson 00.03.39 – Dash: Issue With Signal Voltage From Clutch Pedal Sensor, High Voltage

The controller is receiving a voltage reading from the clutch pedal position sensor (potentiometer/transducer) that exceeds the expected normal operating range. This condition is typically caused by an open circuit on the sensor's ground wire, a short to a higher voltage power source on the signal wire, or an internal failure of the sensor itself.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5710SL
• 5711SL
• 5712SL
• 5713SL

1. 1

   Inspect the clutch pedal sensor (located on the pedal assembly) and its wiring harness for physical damage, heavy dirt/moisture ingress, or corrosion at the connector.

2. 2

   Test the sensor harness for an open circuit, particularly on the ground circuit, which would cause the signal voltage to float high.

3. 3

   Test the signal wire to ensure it is not shorted to a 5V or 12V power supply wire.

4. 4

   Using a multimeter, perform a sensor sweep test to check the resistance or voltage output of the potentiometer as the clutch pedal is depressed. If the reading spikes, drops out, or stays stuck at a high voltage, the sensor has failed internally.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts during repair.

2. 2

   Remove the Sensor

   Locate the clutch pedal position sensor on the clutch pedal pivot assembly. Disconnect the electrical wiring harness plug from the sensor.

3. 3

   Dismount

   Remove the mounting screws/hardware holding the sensor in place and remove the faulty unit.

4. 4

   Install the New Sensor

   Mount the replacement sensor/transducer in the exact same orientation and secure the hardware. Reconnect the wiring harness.

5. 5

   Calibration

   Calibration of the clutch pedal sensor must be carried out every time the sensor or the instrument panel is replaced. This is done via the tractor's dashboard diagnostic menu or a dealer service tool. Failure to calibrate will result in erratic shifting, safety interlocks not disengaging, or the PTO failing to operate.

6. 6

   Test

   Reconnect the battery, clear the fault codes, and perform a road test to ensure smooth transmission engagement and that the code does not return.