Fendt 5.1.FF – A002 - ECU, enhanced control: A002 - ECU, enhanced control — Internal fault (RAM / EEPROM)

Memory checksum error or internal failure within the module's RAM/EEPROM. Triggered when the Comfort E-box no longer receives CAN data for engine speed and PTO speed. Various indicators will no longer be available, or the Comfort E-box will fail completely, though the tractor may still be driven in emergency 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
• 309 Vario
• 310 Vario
• 311 Vario
• 312 Vario
• 415 Vario
• 815 Vario
• 817 Vario
• 818 Vario
• 820 Vario

1. 1

   Check the wiring harness and CAN bus connections between the A002 ECU, the transmission bus, and the EDC (Electronic Diesel Control)

2. 2

   Look for other bus fault codes (e.g., 0.0.11, 0.0.15, 0.0.16) which might indicate a physical wiring or voltage supply issue on the CAN bus rather than a failed ECU

3. 3

   Check the CAN-Bus voltage supply on fuse board A013 (fuses F040, F041)

4. 4

   Connect the FENDIAS diagnostic tool to check the load counter and software status of the A002 ECU

1. 1

   Inspect Wiring and Fuses

   Verify that fuses F040 and F041 on the A013 fuse board are intact and that the A002 ECU is receiving proper voltage.

2. 2

   EOL Reprogramming

   Attempt an EOL (End of Line) reprogramming of the A002 ECU, as the fault is a RAM/EEPROM checksum error.

3. 3

   Module Replacement

   If the EOL programming fails, the internal memory is permanently corrupted, or the E-box is completely dead, remove and replace the A002 Comfort E-box.

4. 4

   Post-Installation

   After installing a new or remanufactured Comfort E-box, perform EOL programming and calibration via FENDIAS to configure the module to the specific tractor.