John Deere 523591.13 – TCU: Reverse Pedal Not Calibrated

The system has detected that the reverse pedal is out of calibration. The voltage signal from the reverse pedal position sensor is outside the expected range stored in the transmission controller's memory (indicated by FMI .13). This fault can prevent or severely affect the proper operation of the tractor's reverse function.

• 1 Series
• 2 Series
• 3 Series
• 4 Series
• 5 Series
• 1025r
• 2025R
• 3039R
• 3320
• 3520
• 3720
• 4210
• 4520
• 5067E

1. 1

   Inspect for physical obstructions such as debris, mud, or objects lodged under or around the reverse pedal that could prevent its full range of motion

2. 2

   Examine the pedal's mechanical linkage for any signs of binding, wear, or sticking bushings that could affect movement

3. 3

   Check the wiring harness leading to the reverse pedal sensor for pinched, chafed, or damaged wires, particularly under the floorboards

4. 4

   Verify sensor voltage by back-probing the signal wire with the key 'on' and engine off. Expected voltage is typically 0.8-1.0V fully depressed and 4.2-4.8V fully released. Fluctuating or out-of-range readings indicate a faulty potentiometer

1. 1

   Prepare machine for calibration

   Ensure the tractor is on a level surface with the parking brake engaged. Turn off all other systems like PTO, cruise control, and four-wheel drive. For some procedures, the wheels may need to be safely lifted off the ground using jack stands.

2. 2

   Perform display-based calibration (if equipped)

   If the tractor features a CommandCenter or similar advanced display, navigate to the transmission controller's diagnostic menu and follow the on-screen prompts. This may require the John Deere Service ADVISOR diagnostic tool.

3. 3

   Initiate Calibration Mode

   The method to enter calibration mode varies. It may involve a specific sequence of key turns and pedal presses.

4. 4

   Perform manual calibration sequence

   Turn the key to the 'on' position. Unplug the reverse pedal sensor, wait 5 seconds, turn the key off, wait 5 seconds, and plug the sensor back in. Turn the key back on, wait 5 seconds, then press the reverse pedal firmly to the floor and hold for 5 seconds before releasing. Turn the switch off and wait 5 seconds.

5. 5

   Calibrate eHydro transmissions (if applicable)

   For eHydro transmissions (often indicated by flashing dash lights), calibrate both forward and reverse pedals by pressing each pedal until the wheels begin to creep, then releasing.

6. 6

   Replace potentiometer

   If the calibration is unsuccessful or the sensor voltage readings in the diagnostic checks were out of range, replace the reverse pedal potentiometer and repeat the calibration procedure.