Fendt 1.2.84 (DEUTZ EMR) – ECU EMR2: Reference voltage 2 for Y035 - actuator out of permissible range

The engine control unit has detected that the reference voltage circuit (specifically Reference Voltage 2) supplying the Y035 actuator is outside of its expected operating parameters. The Y035 actuator functions as the rotary position sensor magnet and position sensor (reference coil) for the engine governor/injection pump. The system defaults to a substitute value of 5 VDC.

• 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 Favorit 900
• Fendt 900 Vario
• 916
• 920
• 924
• 926
• 930
• Fendt 800 Vario
• Fendt 700 Vario
• Fendt 400 Vario
• Fendt 300 Vario

1. 1

   Verify the main voltage supply to the ECU EMR2

2. 2

   Inspect the wiring harness from the Y035 actuator to the ECU for breaks or short circuits

3. 3

   Check the Y035 actuator using the DEUTZ SERDIA diagnosis program to monitor live voltage and position feedback

4. 4

   Switch the ignition OFF, wait, and then switch it back ON to see if the fault clears or returns

1. 1

   Cycle ignition

   Turn the ignition OFF, then turn it back ON.

2. 2

   Replace ECU EMR2

   If the error reappears immediately, the internal reference voltage circuit within the ECU has failed. The official remedy is to replace the ECU EMR2.

3. 3

   Save data record

   Before removing the old ECU EMR2, you must connect the SERDIA diagnostic tool and save the old data record (engine dataset/parameters).

4. 4

   Install new ECU

   Install the new, unprogrammed ECU EMR2.

5. 5

   Load data record

   Load the saved data record 1:1 into the new ECU EMR2. The engine cannot be started until the new control unit is successfully programmed.