Fendt 04.1.65 – A050 - ECU, basic control unit: Faulty stationary function actuation, low side brake

An electrical fault on the earth (ground) side of the circuit leading to the Y053 - Active hold function solenoid valve causes the tractor to lose its active hold/stationary function.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 300 Vario (COM III)
• 409 Vario (COM III)
• 410 Vario (COM III)
• 411 Vario (COM III)
• 412 Vario (COM III)
• 711 Vario (COM III)
• 712 Vario (COM III)
• 714 Vario (COM III)
• 715 Vario (COM III)
• 716 Vario (COM III)
• 717 Vario (COM III)
• 718 Vario (COM III)
• 815 Vario (COM III)
• 817 Vario (COM III)
• 818 Vario (COM III)
• 820 Vario (COM III)
• 916 Vario (COM III)
• 920 Vario (COM III)
• 922 Vario (COM III)
• 924 Vario (COM III)
• 926 Vario (COM III)
• 927 Vario (COM III)
• 930 Vario (COM III)
• 933 Vario (COM III)
• 936 Vario (COM III)

1. 1

   Inspect the earth (ground) side wiring from the A050 ECU to the Y053 solenoid valve for open circuits, high resistance, or shorts to ground.

2. 2

   Test the K051 - Relay, active hold function to ensure it switches properly and its signal line is intact.

3. 3

   Unplug the Y053 solenoid valve and use a multimeter to check the internal resistance of the solenoid coil to determine if the valve has an internal short or open circuit.

1. 1

   Park and secure the tractor

   Safely park the tractor on level ground, turn off the ignition, and engage manual wheel chocks since the active hold function is compromised.

2. 2

   Locate the Y053 solenoid valve

   Locate the Y053 Active hold function solenoid valve (cardan brake valve), which is typically mounted on the transmission/rear axle assembly.

3. 3

   Disconnect the valve connector

   Disconnect the electrical connector to the Y053 solenoid valve.

4. 4

   Verify and repair the ground circuit

   Using a multimeter, verify the integrity of the ground circuit back to the A050 ECU. Repair any damaged wiring, rubbed-through insulation, or corroded connector pins found in the harness.

5. 5

   Test and replace the K051 relay

   Locate and test the K051 relay. Replace the relay if it fails to switch properly under load.

6. 6

   Replace the Y053 solenoid valve

   If the wiring harness and relay are fully intact and functioning correctly, remove the retaining hardware, extract the faulty Y053 valve, and install a replacement.

7. 7

   Clear fault codes

   Clear the fault codes using the tractor's terminal or FENDIAS diagnostic tool.

8. 8

   Test drive the tractor

   Test drive the tractor and verify that the stationary/active hold function engages properly without throwing the 04.1.65 code.