Fendt 1.2.84 (MAN EDC) – EDC Control Module (A021): B025 - EDC speed sensor signal fault

Signal fault. The signal is statically or dynamically not plausible. The fault results in reduced power (full power flow reduced by 25-40%) and a reduced maximum speed of 1800 RPM. The system switches from injection start control to a predefined injection start characteristic. If there is a complete loss of correspondence between pump speed sensors, the engine will stop.

• 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 Vario series (chassis number 23/3001 and up)
• Fendt Farmer 400 Vario series
• Fendt Favorit 700 Vario series
• Fendt 800 Vario series

1. 1

   Verify the physical distance from the sensor to the flywheel to ensure it is within specification

2. 2

   Inspect the sensor tip for metallic chips or debris that could be causing a faulty signal

3. 3

   Inspect the wiring harness for disruptions or short circuits. Check Fendt Connector X172 (Pin 1: Earth, Pin 2: Signal)

4. 4

   Check the voltage supply and earth at the EDC Control Module (A021) using an adaptor box

5. 5

   Connect the FENDIAS diagnostic tool to record failure and ambient parameters, clear the failure memory, and check if the fault returns

1. 1

   Turn off the ignition and disconnect the battery before working on the EDC system.

2. 2

   Locate the B025 EDC speed sensor.

   Typically mounted near the flywheel/bell housing.

3. 3

   Disconnect the X172 connector and inspect the pins for corrosion or damage.

4. 4

   Remove the sensor and clean off any metallic shavings or debris from the magnetic tip.

5. 5

   Reinstall the sensor, ensuring the air gap (distance to the flywheel) is correctly set according to the specific engine's manual.

6. 6

   If the wiring is intact, the gap is correct, and the fault persists after clearing the codes with FENDIAS, replace the B025 EDC speed sensor.