Fendt 09.1.E2 – A050 Basic Control Unit (ECU): Y070 EHR cut-off valve, front - Undervoltage

Undervoltage (where U < 8V) at the Y070 EHR cut-off valve, front. As a safety measure, the valve automatically moves to neutral and locks, which will disable the front power lift enhanced control functions.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III, SCR / Tier 4)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III, SCR / Tier 4)

1. 1

   Voltage Test: Measure the voltage at the Y070 valve connector while the system is active. Normal operating voltage should be system voltage (approx. 12-14 VDC).

2. 2

   Wiring & Connector Inspection: Trace the wiring harness from the Y070 valve back to the A050 Basic Control Unit. Look for chafed wires, pinched lines, or severe corrosion in the connectors.

3. 3

   Solenoid Resistance Check: Measure the internal resistance of the Y070 valve solenoid to check for an internal short that can pull the circuit voltage down.

4. 4

   Fuse & Supply Check: Verify the power supply and fuses feeding the A050 ECU and the hydraulic valve circuits.

1. 1

   Relieve Pressure

   Safely park the tractor, turn off the engine, and manually relieve all hydraulic pressure from the front power lift and central control block circuits.

2. 2

   Locate the Valve

   Locate the Y070 EHR cut-off valve on the front power lift hydraulic block.

3. 3

   Disconnect

   Unplug the electrical connector from the Y070 valve.

4. 4

   Clean the Area

   Thoroughly clean the hydraulic block around the valve to ensure no dirt or debris enters the hydraulic system during removal.

5. 5

   Remove the Valve

   Unscrew and remove the faulty Y070 solenoid/valve assembly from the block.

6. 6

   Install the New Part

   Lubricate the O-rings on the new valve with clean hydraulic oil. Install the new valve and torque it to the manufacturer's specifications.

7. 7

   Reconnect

   Plug the electrical harness back into the valve, ensuring the connector clicks securely into place.

8. 8

   Clear Codes

   Turn on the tractor and use the Varioterminal or FENDIAS diagnostic software to clear the stored 09.1.E2 fault code from the A050 ECU memory.

9. 9

   Test

   Run the tractor and operate the front power lift through its full range of motion to confirm the undervoltage fault does not return and the lift operates smoothly.