Fendt A.1.32 – A002 - ECU, enhanced control: Auxiliary control valve Y017 (Spool Valve 3) supply voltage < 8 volts

The supply voltage to the auxiliary control valve Y017 (Spool Valve 3) has dropped below 8 volts. As a built-in safety mechanism, the low voltage causes the valve actuator to fail, and the valve automatically moves into the neutral position.

• 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 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)

1. 1

   Check fuses F040 and F041 on printed circuit board A013, which supply power for the CAN bus and the auxiliary valves.

2. 2

   Perform a voltage drop test by measuring the supply voltage directly at the electrical connector for valve Y017 (Valve 3) to ensure it is receiving standard system voltage (above 8V).

3. 3

   Inspect the wiring harness between the A002 ECU, the A013 circuit board, and the Y017 valve for chafing, corrosion, or loose connector pins that could cause high resistance.

4. 4

   Isolate the valve by swapping the electrical connector from Y017 (Valve 3) with an adjacent valve (e.g., Y016 / Valve 2). If the low-voltage fault follows the connector, the issue is in the tractor's wiring. If the fault stays with the Y017 valve, the valve's internal solenoid/electronics are failing.

1. 1

   Depressurize the System

   Turn off the tractor and actuate the hydraulic levers/joystick to relieve all hydraulic pressure from the auxiliary circuits.

2. 2

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical shorts during repair.

3. 3

   Wiring Repair

   If the diagnostic checks revealed a wiring fault, repair the damaged section of the harness or replace the corroded connector at the valve.

4. 4

   Valve Replacement

   If the valve is faulty, disconnect the electrical harness from the Y017 valve. Clean the area around the auxiliary control valve block thoroughly to prevent system contamination. Unbolt the faulty spool valve section (Valve 3) from the central hydraulic distributor block. Install the new auxiliary control valve using new O-rings and torque the mounting bolts to the manufacturer's specification.

5. 5

   Reassembly and Calibration

   Reconnect the electrical harness and the battery.

6. 6

   EOL Programming

   Using the FENDIAS diagnostic tool, perform an EOL (End of Line) teach-in program to register the new valve's position on the CAN bus.