Fendt B035 – EDC: Hand Throttle Sensor Fault

The Electronic Engine Control (EDC) unit has detected a fault related to the Sensor Hand Throttle Reg.B (also known as the hand throttle turning angle sensor or manual throttle rotary control). This indicates a break in the wiring, a short circuit, or an implausible signal where the sensor's output does not match the expected range for the lever's position, making the throttle signal unreliable.

• 400 Vario Series
• 700 Vario Series
• 800 Vario Series
• 900 Vario Series

1. 1

   Visually inspect the wiring harness and connectors leading to the hand throttle sensor for chafing, breaks, or corrosion.

2. 2

   Check if the sensor signal is plausible (e.g., ensure it is not sending a high throttle reading when the lever is physically at idle).

3. 3

   Perform a potentiometer test using a multimeter: measure total resistance across the outer terminals, then check the center wiper terminal for smooth resistance changes without dead zones or erratic jumps while moving the lever.

4. 4

   Check for continuity and short circuits in the wiring between the hand throttle sensor and the EDC unit using a model-specific wiring diagram.

1. 1

   Disconnect battery

   Disconnect the tractor's battery to prevent electrical hazards before beginning work.

2. 2

   Access the sensor

   Remove any armrest or console covers necessary to gain access to the hand throttle assembly and its sensor.

3. 3

   Remove faulty sensor

   Disconnect the electrical connector from the sensor. Unbolt and remove the old sensor from the hand throttle lever mechanism.

4. 4

   Install new sensor

   Mount the new sensor, ensuring it is correctly oriented and securely fastened. Reconnect the electrical connector.

5. 5

   Reassemble and reconnect

   Reinstall any console covers or panels that were removed. Reconnect the tractor's battery.

6. 6

   Perform calibration

   Use the tractor's diagnostic system to perform a mandatory calibration using code 4002. This teaches the control unit the new sensor's voltage range for idle and full throttle.

7. 7

   Clear fault codes

   After a successful repair and calibration, clear all stored fault codes from the system memory.