Fendt 01.1.3F – A050 - Basic control unit ECU (EXT) / A077 - Immobiliser ECU: B083 - Immobiliser control

The equipment features programmed into the basic control unit do not match the immobiliser system's expected parameters. This configuration mismatch causes the speed governor and 4WD system to automatically engage when braking.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)
• Fendt 724 S4

1. 1

   Verify that a properly taught-in ignition key with a valid transponder is being used, as immobiliser faults often stem from unrecognized keys.

2. 2

   Use Fendt FenDias diagnostic software to verify communication between the A050 (Basic control unit), A077 (Immobiliser ECU), and the Engine Control Unit (EDC).

3. 3

   Read out the KWP code using SERDIA/Fendias to check for manipulation protection or deeper injection system faults.

4. 4

   Check the parameter configurations in the A050 Basic control unit to confirm exactly which equipment features are causing the mismatch with the immobiliser.

1. 1

   Connect diagnostic system

   Connect the tractor to the Fendt FenDias diagnostic system.

2. 2

   Navigate to programming

   Navigate to the programming section for the A050 Basic control unit and the Immobiliser.

3. 3

   Perform new activation

   Perform a "New activation" of the immobiliser system to sync the modules.

4. 4

   Execute EOL programming

   Execute EOL (End Of Line) programming to rewrite and correct the equipment features so that the A050 Basic control unit matches the A077 Immobiliser ECU.

5. 5

   Clear codes and test drive

   Clear the fault codes and test drive the tractor to ensure the 4WD and speed governor no longer engage abnormally during braking.