Fendt 1E.1.B4 – A051 - ECU, engine control unit (EDC 7): CAN message missing - No Tempomat cruise control CAN message.

This indicates a communication failure on the tractor's Controller Area Network (CAN) bus. Specifically, the engine control unit is failing to receive the required CAN message related to the 'Tempomat' (cruise control) system. As a direct consequence, the cruise control function is disabled.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 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

1. 1

   Refer to the Fendt 'EDC control' circuit diagram (Sheet 21) which governs the A051 ECU and Tempomat CAN messaging.

2. 2

   Inspect the physical CAN bus wiring and connections between the A051 Engine Control Unit and the A002 Enhanced Control Unit for open circuits, corrosion, or pin damage.

3. 3

   Ensure the A051 module is receiving proper voltage and that the CAN High and CAN Low lines are intact.

1. 1

   Repair Wiring

   If a break or short is found in the CAN bus wiring between the A051 ECU and the tractor's main network (per Sheet 21), repair the harness or connector.

2. 2

   Clear the Fault

   Once the physical communication issue is resolved, the fault must be cleared from the engine control unit's memory. Connect the Fendt SERDIA diagnostic software.

3. 3

   Delete Error

   Execute the command to delete the error (Internal SERDIA reference: FC:0070).

4. 4

   Test Operation

   Restart the tractor and test the Tempomat (cruise control) to verify the CAN message is now being successfully transmitted and received.

5. 5

   Replace Engine Control Unit

   If the A051 ECU itself is found to be internally faulty and requires replacement, the new unit will require EOL (End of Line) programming via SERDIA to match the tractor's chassis number and immobilizer.