Fendt 04.1.83 – A050 - ECU, basic control unit: Plausibility error between hydrostatic collecting shaft sensor (B014) and bevel pinion sensor (B015)

A plausibility error indicating that the rotational speed and direction signals from the hydrostatic collecting shaft Hall sensor (B014) and the bevel pinion Hall sensor (B015) do not match. The fault is typically triggered at speeds of 5 km/h or higher, restricting normal operation but allowing continuation in emergency mode.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 409 Vario COM III
• 410 Vario COM III
• 411 Vario COM III
• 412 Vario COM III
• 711 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 815 Vario COM III & S4
• 817 Vario COM III & S4
• 818 Vario COM III & S4
• 822 Vario COM III & S4
• 824 Vario COM III & S4
• 826 Vario COM III & S4
• 828 Vario COM III & S4
• 916 Vario COM III & S4
• 920 Vario COM III & S4
• 922 Vario COM III & S4
• 924 Vario COM III & S4
• 926 Vario COM III & S4
• 927 Vario COM III & S4
• 930 Vario COM III & S4
• 933 Vario COM III & S4
• 936 Vario COM III & S4
• 939 Vario COM III & S4

1. 1

   Check the 8.5 V power supply to the sensors via the A013 microfuse board (check fuse 7, 8, or 16 depending on the model)

2. 2

   Inspect wiring harnesses and separation points (X163 for B014 and X164 for B015) for continuity, short circuits, or corrosion between the sensors and the A050 ECU

3. 3

   Verify the travel range detection sensor (B016) or range change potentiometer is functioning correctly, as faults here can cause related plausibility errors

4. 4

   Use the Variotronic Ti terminal or FENDIAS diagnostic software to monitor live speed outputs of B014 and B015 to identify which sensor is dropping the signal or providing erratic readings

1. 1

   Safely park the tractor on level ground, apply the handbrake, and turn off the ignition.

2. 2

   Locate the B014 (hydrostatic collecting shaft) and B015 (bevel pinion) sensors on the Vario transmission insert/control housing.

3. 3

   Disconnect the electrical harness from the suspect sensor(s).

4. 4

   Remove the retaining bolts and carefully extract the faulty sensor from the transmission housing.

5. 5

   Clean the mounting port to ensure no debris falls into the transmission.

6. 6

   Install the new B014 and/or B015 sensor and tighten to the specified torque.

7. 7

   Reconnect the electrical harness.

8. 8

   Turn on the ignition and use the tractor's terminal to clear the stored fault codes.

9. 9

   Test drive the tractor above 5 km/h to ensure the plausibility error does not return and the transmission shifts correctly.