Fendt 4.1.B2 – A002 - ECU, enhanced control: A002 - ECU, enhanced control — Fault in EPROM programming (driving mode selector I / II) or (range control I / II).

The EPROM (memory) inside the enhanced control unit has encountered a programming fault, data corruption, or checksum error specifically related to the parameters for the driving mode selector (travel range control I / II). The tractor's transmission range (I / II) cannot be changed while driving. The tractor may be locked into its current range or default to a restricted operating mode.

• 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
• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario
• 409
• 410
• 411
• 412
• Fendt 700 Vario
• 711
• 712
• 714
• 716
• Fendt 800 Vario
• 815
• 817
• 818
• Fendt 900 Vario
• 916
• 920
• 924
• 926
• 930

1. 1

   Verify power and ground voltage supply to the CAN-Bus and the A002 ECU, specifically inspecting the A013 fuse board (fuses F040 and F041)

2. 2

   Check for accompanying CAN-bus communication errors (e.g., 0.0.15, 1.1.A0) that might indicate a wiring harness issue or voltage drop causing data corruption rather than a hard EPROM failure

3. 3

   Determine ECU generation by checking the tractor's chassis number (older models require physical chip replacement, newer models ending in ../8001 and up are flash-programmable)

1. 1

   Connect diagnostic tool

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

2. 2

   Turn ignition ON

   Turn the ignition to the "ON" position.

3. 3

   Establish communication

   Open the FENDIAS software and establish communication with the A002 - ECU, enhanced control.

4. 4

   Navigate to EOL menu

   Navigate to the EOL (End Of Line) programming menu.

5. 5

   Reflash/reprogram ECU

   Reflash/reprogram the A002 ECU with the correct tractor parameters, specifically targeting the transmission range control parameters.

6. 6

   Clear codes and test drive

   Clear the fault codes and test drive the tractor to verify that range switching (I / II) functions normally while driving.

7. 7

   Replace module if programming fails

   If the FENDIAS system cannot overwrite the EPROM (indicating a hardware failure of the memory chip), the A002 ECU must be replaced and subsequently EOL programmed to match the tractor.