John Deere 3033.04 – OIC / TMB / XMB: Sensor Unit for Left Brake Pedal, Voltage Too Low

The voltage at the signal input of the left brake pedal position sensor (potentiometer) has dropped below 0.25 volts. This typically points to a problem with the signal lead circuit, a loss of the potentiometer's supply voltage, or a failure of the sensor itself.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 9470RT
• 9520RT
• 9570RT
• 8245R through 8400R
• 9RT Series
• 8R Series
• 8RW Series

1. 1

   Inspect the wiring harness for the signal lead and power supply routing to the left brake pedal potentiometer for physical damage, loose connections, or corrosion.

2. 2

   Verify that the potentiometer is receiving the correct supply voltage from the control module, as a weak or shorted circuit can cause low voltage readings.

3. 3

   Use a multimeter to measure the voltage at the signal input wire. Check if the signal consistently reads below 0.25 volts when the pedal is actuated despite having good power and ground.

1. 1

   Repair Wiring

   If the diagnostic checks reveal damaged wiring, loose pins, or corrosion in the connectors, repair or replace the affected harness sections.

2. 2

   Replace Sensor

   If the wiring and power supply are intact but the sensor output remains below 0.25V, replace the Left Brake Pedal Position Sensor.

3. 3

   Calibrate

   After installing a new sensor, a calibration procedure will likely be required.

4. 4

   Verify Operation

   Clear the codes and monitor the system to ensure the error does not recur and that the brake pedal functions correctly.