Fendt 5.1.66 – A002 - ECU, Enhanced Control: Y012 - Valve, charge suspension — Actuation fault

There is an electrical actuation or signal failure communicating with the Y012 solenoid valve, which controls the charge function for the front axle suspension and hydraulic oil pre-heating. As a safety measure, the tractor's system automatically forces the suspension into a 'Lock' status, rendering the suspension non-operational.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt Farmer 400 series
• Fendt Favorit 700 and 900 series
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 500 Vario S4
• Fendt 700, 800, and 900 Vario (COM III)

1. 1

   CRITICAL SAFETY STEP: Manually relieve hydraulic pressure (up to 200 bar) by screwing in the knurled-head screw on the Y013 valve, then the Y014 valve, to relieve the rebound accumulator for the Y012 valve.

2. 2

   Inspect the wiring harness for breaks, corrosion, or short circuits.

3. 3

   Check the separation point connector X323 (which plugs into the Y012 valve) for damage or poor connection.

1. 1

   Locate the Valve

   The Y012 valve is located at the right entrance step of the tractor, on top of the central control block (ZSB). Specifically, it is threaded into bore 2011.

2. 2

   Gain Access

   Remove the right footplate/step and the metal cover panel behind the hydraulic oil tank to expose the central control block.

3. 3

   Depressurize

   Perform the manual pressure release procedure described in the diagnostic steps.

4. 4

   Disconnect

   Unplug the X323 electrical connector from the Y012 solenoid valve.

5. 5

   Remove

   Unscrew the Y012 valve from bore 2011.

6. 6

   Replace/Reseal

   Install the new Y012 solenoid valve. If the valve is mechanically sound but leaking, install a new OEM seal kit.

7. 7

   Reassemble

   Reconnect the X323 electrical connector. Back out the knurled screws on the Y013 and Y014 valves to restore normal hydraulic operation. Reinstall the metal cover and footplate.

8. 8

   Clear Codes

   Use the FENDIAS diagnostic system to clear the 5.1.66 fault code and test the suspension operation.