Massey Ferguson 04.03.20 – TRANS: Issue With Signal Voltage From Foot Throttle Sensor

The foot throttle sensor (accelerator pedal position sensor) operates as a potentiometer. This fault code is triggered when the control module detects that the signal voltage from the foot throttle sensor is out of the acceptable range (typically above 4.5V or below 0.5V), indicating a potential open circuit, short to ground, or a failed sensor track.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710SL
• 5711SL
• 5712SL
• 5713SL
• 7719S

1. 1

   Inspect the wiring harness running from the foot throttle pedal assembly to the Transmission Control Unit (TCU) for chafing, breaks, or melted insulation

2. 2

   Disconnect the foot throttle sensor and check the pins for corrosion, moisture ingress, or pushed-back terminals

3. 3

   Using a multimeter, verify that the sensor is receiving the correct reference voltage (usually 5V) and has a good ground

4. 4

   Sweep the pedal slowly while monitoring the signal wire to see if the voltage drops out or spikes erratically (which confirms a dead spot in the potentiometer)

1. 1

   Power Down

   Turn off the tractor, remove the key, and engage the parking brake.

2. 2

   Access the Sensor

   Locate the foot throttle sensor assembly at the base of the accelerator pedal inside the cab.

3. 3

   Removal

   Disconnect the electrical harness connector from the sensor. Remove the mounting hardware (screws/bolts) securing the potentiometer to the pedal linkage.

4. 4

   Installation

   Mount the new foot throttle sensor in the exact orientation as the old one and secure the fasteners. Reconnect the electrical harness.

5. 5

   Calibration

   A new throttle potentiometer must be calibrated to the tractor's control modules so the system learns the new minimum (idle) and maximum (full throttle) voltage limits. This is typically done using the Massey Ferguson Electronic Diagnostic Tool (EDT) or via the tractor's onboard 'H Menu' (diagnostic/calibration menu) accessed through the dashboard display.

6. 6

   Clear Codes

   Clear the 04.03.20 fault code from the TRANS module memory and test drive the tractor to ensure smooth throttle response.