Fendt 4.1.FF – A002 - ECU, enhanced control: Internal fault (RAM / EEPROM)

Memory or checksum error on the module's internal circuit board. Tractor restricts functions, but continuation in emergency mode (auxiliary operation) is possible.

• 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
• 309
• 310
• 311
• 312
• 409
• 410
• 411
• 412
• 413
• 414
• 415
• 711
• 712
• 714
• 716
• 718
• 815
• 817
• 818
• 820
• 916
• 920
• 924
• 926
• 930

1. 1

   Verify the voltage supply and CAN-Bus connections on fuse board A013, specifically checking fuses F040 and F041 which supply power to the A002 module.

2. 2

   Check the main separation point connector (X031) on the A002 ECU for corrosion, moisture, or loose pins.

3. 3

   Connect the FENDIAS diagnostic tool and attempt to run a new EOL (End of Line) programming sequence to see if the flash memory can be overwritten.

1. 1

   Preparation

   Park the tractor on a level surface, turn off the ignition, and disconnect the battery to prevent electrical spikes.

2. 2

   Locate the ECU

   The A002 ECU is located inside the cab, on the right-hand mudguard.

3. 3

   Access the Module

   Remove the interior side panel covering the right mudguard to expose the electronics box.

4. 4

   Removal

   Carefully disconnect the X031 wiring harness connector from the A002 ECU. Unbolt the module from its mounting bracket and remove it from the tractor.

5. 5

   Installation

   Mount the replacement (or repaired) A002 ECU into the bracket and secure the bolts. Reconnect the X031 wiring harness securely.

6. 6

   Reassembly

   Reinstall the right mudguard interior panel and reconnect the tractor's battery.

7. 7

   Calibration

   Connect the FENDIAS diagnostic system. You MUST perform EOL (End of Line) programming to flash the correct software parameters for your specific chassis number and calibrate the transmission settings before the tractor can be operated normally.