Fendt 00.0.01 – A002 - ECU, enhanced control / A050 - ECU, basic control unit: Bus error EDC/EMR, speed setpoint to EDC missing

A CAN bus communication error where the tractor's main control unit is failing to send or receive the required engine speed setpoint data to/from the Engine Electronic Data Control (EDC) or Electronic Motor Regulator (EMR), resulting in an 'Engine malfunction' or restricted operating mode.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III) (e.g., 916, 920, 922, 924, 927, 930, 933, 936)

1. 1

   Verify the A002/A050 ECU is receiving stable and correct voltage by checking fuses, relays, and ground connections

2. 2

   Inspect the CAN bus communication lines (G-bus/K-bus) between the ECU and the Engine Control Unit (EDC/EMR) for chafed wires, corrosion at the harness connectors, or broken pins

3. 3

   Connect the FENDIAS diagnostic tool to check if the ECU has lost its programming or has an EEPROM checksum error

1. 1

   Verify Power and Ground

   Using a multimeter, verify the power and ground circuits feeding the A002/A050 ECU. Repair any voltage drops or damaged wiring.

2. 2

   Test CAN Communication

   Ohm test the CAN bus lines between the main ECU and the engine EDC. If resistance is out of spec (normally ~60 ohms across the network), locate and repair the break in the wiring harness.

3. 3

   Perform EOL Programming

   If the wiring and voltage are intact, perform an EOL (End-of-Line) programming procedure using the FENDIAS diagnostic software to re-flash the data record to the ECU.

4. 4

   Replace the ECU

   If EOL programming fails, the EEPROM cannot be overwritten, or the module has suffered an internal hardware failure, the A002/A050 ECU must be replaced.

5. 5

   Post-Installation Calibration

   After installing a new ECU, you must perform EOL programming to match the module to the tractor's specific chassis number and calibrate the tractor's sensors (e.g., transmission, steering, hydraulics).