Fendt 8.3.16 – A014 - ECU, EPC OBE: Internal voltage regulator dropped to Stable voltage < 1 volt

The internal voltage regulator has dropped to a 'Stable voltage < 1 volt'. Because the voltage is below the required operating threshold, the system triggers a fault status, and the electrohydraulic power lift control is immediately terminated and locked for safety.

• 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 900 Vario series
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt 800 Vario series
• Fendt 700 Vario series
• Fendt 400 Vario series
• Fendt 300 Vario series

1. 1

   Verify the tractor's overall battery and charging system voltage.

2. 2

   Inspect the CAN bus power supply on the A013 circuit board, specifically checking fuses F040 and F041.

3. 3

   Review the 'Electrohydraulic power lift control' circuit diagram to trace the voltage supply lines to the A014 ECU.

4. 4

   Ensure the external rear power lift pushbuttons on the cab or fenders are not damaged or shorting out the circuit.

1. 1

   Access the Module

   Locate the A014 - ECU, EPC OBE on the central control block. Access it from the entry on the right side of the tractor by removing the cover panels.

2. 2

   Test the Harness

   Disconnect the wiring harness from the A014 module. Using a multimeter, test the supply pins for proper voltage and check the ground pins for high resistance.

3. 3

   Repair Power Supply

   If voltage is missing at the harness, replace blown fuses (F040/F041 on the A013 board) or repair any broken/shorted wires in the harness.

4. 4

   Replace the ECU

   If the harness provides the correct voltage to the module but the fault code 8.3.16 persists, the internal circuitry of the A014 ECU has failed and the module must be replaced.

5. 5

   Reprogram and Clear Codes

   Install the new module, perform EOL (End of Line) programming via the FENDIAS diagnostic tool, clear the stored fault codes from the terminal, and test the rear power lift to confirm the control lock has been lifted.