Fendt 09.1.A4 – A050 ECU or A002 ECU: Y070 - EHR cut-off valve, front Flash_Test failure

The valve has failed an internal memory/flash test or has lost its programming parameters. As a safety measure, the valve automatically moves to neutral and locks. The pilot pressure is turned OFF, disabling the front power lift.

• 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 and SCR generations)
• Fendt 800 Vario (COM III and SCR generations)
• Fendt 900 Vario (COM III and SCR generations)

1. 1

   Check for related Y070 valve codes that indicate memory or programming failures, such as 09.1.A2 (EEPROM error), 09.1.A3 (RAM_Test failure), or 09.1.A5 (Incorrect valve code SA/DA)

2. 2

   Inspect the physical wiring harness and connectors leading to the Y070 valve at the front power lift control block to rule out a communication drop causing the flash test to fail

3. 3

   Connect the FENDIAS diagnostic tool to see if the valve can still communicate with the A050 ECU or if it has completely lost its flash memory

1. 1

   Connect Diagnostic Tool

   Connect the tractor to the FENDIAS diagnostic software.

2. 2

   Perform EOL Programming

   Attempt to re-flash and calibrate the Y070 valve.

3. 3

   Test Operation

   If the EOL programming is accepted, clear the fault codes and test the front power lift to ensure the valve unlocks and pilot pressure is restored.

4. 4

   Replace Valve

   If the valve fails the EOL programming or the Flash_Test error immediately returns, the internal memory of the Y070 valve is permanently damaged. The physical valve must be replaced.

5. 5

   Calibrate New Valve

   After installing a replacement Y070 valve, you must perform EOL programming on the new unit to assign it the correct address and calibrate it to the tractor's system.