Fendt A.1.15 – ECU, enhanced control (A002): Y015 - Auxiliary control valve (Spool valve fault, valve 1)

Overvoltage (> 45 volts). The system has detected an abnormally high voltage at the valve's electrical circuit, causing the valve to automatically move into the neutral position and disabling its operation.

• 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
• Farmer 400 Vario
• Favorit 700 Vario
• Favorit 900 Vario
• 300, 400, 700, 800, and 900 Vario series (including COM III generation models)

1. 1

   Identify the Y015 valve (Valve 1, typically color-coded Yellow) located on the central control block (ZSB).

2. 2

   Inspect connector X326 (specifically pins 23, 24, and 26) at the Y015 valve for corrosion, pushed-out pins, or damaged insulation.

3. 3

   Use a multimeter to check the wiring harness between the valve and the ECU for a short to a high-voltage power source.

4. 4

   Verify the power supply for the CAN bus on the circuit board by checking fuses F040, F041, or F047 depending on the exact model.

1. 1

   Prepare tractor for service

   Park the tractor on a level surface, lower all implements, turn off the engine, and disconnect the battery to prevent electrical spikes.

2. 2

   Relieve hydraulic pressure

   Relieve all hydraulic pressure from the system.

3. 3

   Locate valve

   Locate the Y015 (Yellow / Valve 1) auxiliary control valve on the hydraulic valve block.

4. 4

   Inspect and repair wiring

   Disconnect the X326 electrical connector. If wiring damage is found during the diagnostic phase, repair the harness.

5. 5

   Determine if valve replacement is needed

   If the wiring tests perfectly, the internal circuit board/magnet output stage of the Y015 valve has failed and is falsely reading or causing the overvoltage. The valve must be replaced.

6. 6

   Remove faulty valve

   Unbolt the faulty Y015 valve from the central control block (ZSB). Be prepared to catch residual hydraulic oil.

7. 7

   Install new valve

   Install the new control valve with new O-rings/seals and torque to OEM specifications.

8. 8

   Reconnect components

   Reconnect the X326 connector and the battery.

9. 9

   Calibrate new valve

   The new auxiliary control valve must be programmed for its specific position (Position 1 / Yellow) using the EOL (End of Line) program via the FENDIAS diagnostic software.