Fendt A.1.13 – A002 - ECU, enhanced control: Y015 - Auxiliary control valve (Spool valve fault, valve 1 / yellow position) Supply voltage > 18 volts (Overvoltage)

The system detects an abnormally high voltage going to the valve, causing the valve to automatically move into the neutral (safe) 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
• Farmer 400 series
• Favorit 700 series
• Favorit 900 series
• 300 Vario (COM III)
• 400 Vario (COM III)
• 700 Vario (COM III)
• 800 Vario (COM III)
• 900 Vario (COM III)
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario

1. 1

   Measure the supply voltage at the Y015 valve connector (X326, pins 24/26) to verify if it is actually receiving more than 18 volts.

2. 2

   Test the alternator output at the battery while the tractor is running to check for an overcharging condition (>15V).

3. 3

   Check the wiring between the A002 ECU and the Y015 valve for shorts to a higher voltage source.

4. 4

   Inspect the power supply for the CAN bus on printed circuit board A013, specifically checking fuses F040, F041, and F047.

1. 1

   Resolve Charging System Issues

   If the alternator is outputting more than 15 volts, replace the alternator voltage regulator or the entire alternator assembly to stop the overvoltage condition.

2. 2

   Repair Wiring

   If the alternator is charging normally but the valve connector shows >18V, trace the wiring harness back to the ECU and repair any shorts to power.

3. 3

   Replace the Valve (if internally shorted)

   If the system voltage is normal (around 12-14V) but the A002 ECU is still logging an internal >18V fault for Y015, the valve's internal electronics/sensor have failed.

4. 4

   Clear Codes and Calibrate

   After replacing the valve or repairing the voltage issue, clear the stored fault codes from the tractor's memory and perform an EOL (End of Line) programming/calibration for the new auxiliary control valve so the ECU recognizes it.