John Deere CAB000091.02 – CAB: Foot Throttle Sensor Problem

The John Deere fault code CAB000091.02 indicates a 'Foot Throttle Sensor Problem' or a 'Foot Throttle Sensor Circuit Voltage Conflict'. This diagnostic trouble code is logged when the system detects an issue with the electrical signals from the foot throttle sensor.

• 8130
• 8230
• 8330
• 8430
• 8530
• 8310RT
• 8335RT
• 8360RT
• 7210J
• 7630
• 7720
• 7820
• 8120
• 8220
• 8320
• 8420
• 8520
• 8225R
• 8245R
• 8270R
• 8295R
• 8310R
• 8320R
• 8335R
• 8345R
• 8360R
• 8370R
• 7R Series
• 8R Series
• 8RT Series
• 8RX Series
• 9R Series
• 9RT Series
• 9RX Series
• 9030 Series
• J-Series Loaders (444J-844J)
• 6R Series (6105R-6210R)

1. 1

   Carefully inspect the foot throttle sensor, its connector, and the wiring harness for any visible signs of damage, corrosion, or loose connections.

2. 2

   Cycle the key switch or restart the engine to attempt vehicle recovery and see if the code clears (in case of an intermittent issue).

3. 3

   Perform a voltage signal test: Turn ignition ON (engine off), back-probe the sensor connector, and check for a 5V reference between the reference and ground wires.

4. 4

   Measure the signal wire voltage: It should read approximately 0.5 volts at idle and increase smoothly to around 4.5 volts when the pedal is fully pressed. Any sudden jumps, drops, or dead spots indicate a faulty sensor.

1. 1

   Confirm diagnosis

   Perform the recommended voltage and visual diagnostic checks to confirm the foot throttle sensor is the source of the fault.

2. 2

   Disconnect battery

   Disconnect the negative battery terminal before beginning any electrical work for safety.

3. 3

   Remove faulty sensor

   Locate the foot throttle sensor on the pedal assembly. Disconnect the electrical connector and unbolt the sensor from its mounting.

4. 4

   Install new sensor

   Mount the new sensor onto the throttle pedal assembly, tighten bolts to manufacturer specification, and reconnect the electrical connector.

5. 5

   Reconnect battery

   Reconnect the negative battery terminal.

6. 6

   Clear codes and calibrate

   Start the tractor and use a diagnostic display or service tool to clear the fault codes. Perform a sensor calibration procedure if required by the specific model. If the code reappears, there may be an issue with the wiring harness or the CAB controller itself, which would require more advanced diagnostics.