Fendt 9.1.53 – Front Power Lift / VENDI (Valve Electronics): Y019 Auxiliary Control Valve Overvoltage (Supply voltage > 18 volts)

The Y019 auxiliary control valve has detected a supply voltage exceeding 18 volts. As a safety measure, the valve automatically moves into the neutral position, and auxiliary/front power lift functions are disabled.

• 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
• 300 Vario Series SCR / S4 (310, 311, 312, 313)
• Farmer 400 Vario COM III
• 500 Vario Series SCR / S4 (512, 513, 514, 516)
• Favorit 700 Vario
• 700 Vario Series SCR / S4 (714, 716, 718, 720, 722, 724)
• 800 Vario Series
• Favorit 900 Vario (916, 920, 924, 926, 930)

1. 1

   Check the tractor's charging system (alternator output and voltage regulator) to ensure it is not overcharging the electrical system (voltage > 18V)

2. 2

   Inspect the wiring harness leading to the Y019 auxiliary control valve for a short to power condition

3. 3

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

4. 4

   Measure the voltage directly at the Y019 valve connector to verify if the overvoltage is real or a false reading from a failed internal circuit board (normal is 12V-14V)

1. 1

   Resolve Overvoltage

   If the alternator is overcharging, replace the alternator voltage regulator or the entire alternator assembly.

2. 2

   Repair Wiring

   Repair any damaged wiring or shorts in the harness leading to the Y019 valve.

3. 3

   Valve Repair/Replacement

   If the tractor's voltage is normal but the valve's internal electronics are fried, send the valve out to a specialized agricultural electronics repairer (e.g., Ilgenfritz Mechatronics) or replace the entire Y019 Selective Control Valve assembly.

4. 4

   Clear Codes and Calibrate

   After repair, use the FENDIAS diagnostic software or the tractor's terminal to clear the stored fault codes and perform an EOL (End of Line) reprogramming/calibration if a new valve was installed.