Fendt 06.1.98 – MFA (Multifunction Armrest): Counter error for the Button 1000, REAR PTO

The control unit has detected an internal logic or counter mismatch regarding the 1000 RPM rear PTO speed preselection button.

• 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 & SCR models)
• Fendt 800 Vario (COM III & SCR models)
• Fendt 900 Vario (COM III & SCR models)

1. 1

   Physically inspect the '1000' rear PTO button on the multifunction armrest to ensure it is not stuck, jammed by debris, or mechanically broken.

2. 2

   Check for related CAN bus communication fault codes (such as 06.1.A1 or 06.1.B0), which indicate a wiring or CAN bus initialization failure rather than just a counter error.

3. 3

   Cycle power by restarting the tractor to see if the counter error clears on a fresh boot cycle.

1. 1

   Connect diagnostic tool

   Connect the FENDIAS (Fendt Diagnostic System) interface to the tractor's diagnostic port.

2. 2

   Navigate to module

   Navigate to the MFA (A039 or A100) control module.

3. 3

   Perform programming

   Perform EOL (End-Of-Line) programming. This procedure resets the module's parameters and clears the internal counter mismatch.

4. 4

   Clear fault codes

   Once the EOL programming is complete, clear the stored fault codes from the tractor's memory.

5. 5

   Test operation

   Test the rear PTO 1000 RPM button to verify that the PTO speed can now be selected without triggering the code.

6. 6

   Replace component

   If the EOL programming fails to resolve the issue, or if the button is internally shorted/damaged, replace the multifunction armrest (or the specific keypad sub-assembly).