Fendt 4.1.26 – A002 ECU: Signal fault with the A034 - Joystick (Driving switch)

The signal for the accelerator pedal mode (or throttle pedal mode) is faulty. The system detects that the drive switch is either sending an invalid signal or is physically stuck in the engaged position, rendering the accelerator pedal mode inoperable.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt Farmer 400 series
• Fendt Favorit 700 series
• Fendt Favorit 900 series
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series

1. 1

   Physical Inspection: Check the accelerator pedal mode button/switch on the A034 joystick to ensure the drive switch is not stuck and returns freely without being jammed by dirt or debris.

2. 2

   FENDIAS Diagnostics: Connect the FENDIAS diagnostic program and navigate to the A034 drive switch diagnostics to monitor the live state of the accelerator pedal mode switch.

3. 3

   Wiring & CAN Bus Check: Inspect the wiring harness and connectors between the A034 Joystick and the A002 ECU for continuity, corrosion, or short circuits.

1. 1

   Power Down

   Turn off the tractor ignition and disconnect the battery or electrical main switch before intervening with the CAN bus components.

2. 2

   Clean/Free the Switch

   If the diagnostic check revealed a physically stuck button, attempt to clean the switch housing on the joystick with electrical contact cleaner.

3. 3

   Replace the Component

   If the switch is internally shorted or the joystick's internal circuit board has failed, the joystick assembly (or the specific switch module) must be replaced. Disconnect the electrical connectors at the base of the joystick and unbolt it from the armrest console.

4. 4

   Install the New Joystick

   Mount the replacement A034 joystick and reconnect the CAN bus wiring harness.

5. 5

   EOL Programming

   Run a new EOL (End of Line) programming / calibration using the FENDIAS dealer tool to initialize the new joystick on the CAN bus.

6. 6

   Clear Codes and Test

   Clear the 4.1.26 fault code from the tractor's memory, start the tractor, engage accelerator pedal mode, and verify that the tractor responds correctly without throwing the code.