Fendt 1.2.2B – A002 / A021: CAN message fault from enhanced control module (A002) to EDC control module (A021), "Engine brake function"

This fault indicates a CAN bus communication failure or interruption between the tractor's enhanced control module (EST) and the electronic diesel control (EDC) module specifically regarding the exhaust/engine brake function. As a direct consequence, the engine brake (exhaust brake) becomes non-operational.

• 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
• Farmer 400 Vario
• Favorit 700 Vario
• Favorit 900 Vario
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series

1. 1

   Inspect the CAN-Bus voltage supply on fuse board A013. Check for any blown fuses that supply power to the A002 or A021 modules.

2. 2

   Check the CAN-Bus wiring between the EST Control Module (A002) and the EDC Control Module (A021) for physical damage, broken wires, or a short circuit to earth.

3. 3

   Connect a diagnostic adaptor box, turn the ignition to 'ON', and test the pin-to-pin continuity between the modules (e.g., checking the connection from A002 connector X031 to A021 connector X048).

4. 4

   Consult the 'EDC engine control', 'Transmission bus', and 'Engine brake' circuit diagrams to trace the exact routing for your specific chassis number.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to ensure safety while working on the CAN bus electrical system.

2. 2

   Fuse Replacement

   If any fuses on fuse board A013 are blown, replace them. If the fuse board itself is damaged, replace the board.

3. 3

   Wiring Repair

   Repair or replace any damaged sections of the CAN-Bus wiring harness between the A002 and A021 modules. Clean all connector pins to ensure a solid connection.

4. 4

   Module Replacement

   If the wiring and power supply are intact but the CAN communication remains interrupted, the A002 (EST) or A021 (EDC) module may have an internal failure. Replace the faulty module.

5. 5

   Reprogramming

   If a control module is replaced, End-of-Line (EOL) reprogramming will be necessary using FENDIAS or Serdia diagnostic software to load the correct tractor data record.

6. 6

   Clear Codes

   Reconnect the battery, turn the ignition on, and clear the stored fault codes from the tractor's memory. Test the engine brake function to confirm the repair.