John Deere 523591.18 – PTH: Reverse Pedal Signal Below Normal Range

The Powertrain Hydrostatic (PTH) control unit has detected that the voltage signal from the reverse pedal sensor is below the expected normal operating range. While the data is valid, the lower-than-normal voltage indicates an issue with the component responsible for generating or transmitting the signal. This is typically caused by a faulty reverse pedal sensor, damaged wiring harness, or a calibration issue, which can affect the operation of eHydro or PowrReverser transmissions.

• 1025R
• 2025R
• 3033R
• 3038R
• 3039R
• 3320
• 3520
• 3720
• 4044M
• 4044R
• 4049M
• 4049R
• 4052M
• 4052R
• 4066M
• 4066R
• 7400A
• L110
• 4310

1. 1

   Visually inspect the wiring harness leading to the reverse pedal sensor for pinched, frayed, or chewed wires, and ensure the connector is clean, secure, and free of corrosion.

2. 2

   Check for other active fault codes; multiple potentiometer codes may indicate a wider issue with the 5-volt sensor supply voltage.

3. 3

   Verify sensor voltage by backprobing the connector with the key ON and engine OFF. Confirm a stable 5-volt supply (often the orange wire) and a good ground (less than 0.1 volts).

4. 4

   Measure the signal wire voltage (often the center wire). Expected range is typically 0.8-1.0 volt with the pedal fully pressed and 4.2-4.8 volts when fully released. Readings below this range indicate a faulty sensor or wiring.

5. 5

   Wiggle the wiring harness and connector while monitoring voltage to check for intermittent loose connections or wire breaks.

1. 1

   Prepare machine for service

   Park the tractor on a level surface, lower all implements to the ground, engage the parking brake, turn the engine off, and remove the key.

2. 2

   Access the sensor

   Remove the operator platform floor mat and the pedal cover to gain access to the forward and reverse pedal sensors located at the base of the pedal assembly.

3. 3

   Repair wiring or remove faulty sensor

   If diagnostics point to a wiring issue (e.g., short to ground), repair the harness. If the sensor is faulty, disconnect the electrical connector, remove the two securing bolts (typically 8mm or 10mm), and remove the sensor.

4. 4

   Install new sensor

   Install the new reverse pedal sensor and secure it with the bolts. Apply dielectric grease to the connector pins to protect against moisture, then reconnect the wiring harness.

5. 5

   Perform manual sensor calibration

   Unplug the new sensor. Turn the key ON for 5 seconds, then OFF. Plug the sensor back in. Turn the key ON for 5 seconds. Press the reverse pedal fully to the floor and hold for 5 seconds, then release. Turn the key OFF.

6. 6

   Clear codes and test operation

   Start the tractor, cycle the key switch, and verify if the fault code has cleared and the reverse pedal functions correctly.