Fendt 0.1.56 – Instrument Panel (A007 / Dashpanel) and Engine Control Unit (ECU, EDC / EMR): B089 - Temperature sensor, Deutz

Indicates a failure related to the engine coolant temperature sensor. The system has detected a break in the wiring, a short circuit, or that the coolant temperature is reading outside the plausible setpoint area. The engine temperature is no longer monitored by the system.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt Favorit 700 and 900 series
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 500 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series

1. 1

   Visual Inspection: Inspect the wiring harness and the electrical connector at the B089 coolant temperature sensor for physical damage, corrosion, or loose pins.

2. 2

   Circuit Testing: Consult the specific tractor circuit diagram (often listed as Sheet 36 for 'Deutz engine control' or the 'Dashpanel' circuit diagram) to trace the signal line. Test the wiring for continuity, shorts to ground, or shorts to power.

3. 3

   Sensor Resistance Test: Because the B089 is an NTC sensor, you can measure its resistance with a multimeter. The resistance should steadily decrease as the engine warms up. If the sensor reads an open circuit (infinite resistance) or a dead short, it has failed internally.

4. 4

   Diagnostic Tool Verification: Connect the SERDIA or FENDIAS diagnostic tool. Look for associated SERDIA fault codes FC:0037 or FC:0038, which confirm the coolant temperature is outside the target range or the circuit is broken.

1. 1

   Ensure the tractor is turned off, the key is removed, and the engine has completely cooled down

   to prevent burns and relieve cooling system pressure.

2. 2

   Locate the B089 engine coolant temperature sensor

   on the Deutz engine block/cooling system.

3. 3

   Disconnect the electrical connector

   from the sensor.

4. 4

   Place a catch pan under the sensor area

   to catch any escaping coolant if the diagnostic checks proved the wiring is intact but the sensor is faulty.

5. 5

   Unscrew and remove the faulty B089 temperature sensor.

6. 6

   Install the new OEM replacement sensor

   and tighten it to the manufacturer's specified torque.

7. 7

   Reconnect the electrical harness

   ensuring the connector clicks securely into place.

8. 8

   Top off the engine coolant

   if any was lost during the swap.

9. 9

   Turn on the ignition and use the SERDIA or FENDIAS diagnostic tool

   to clear the fault code (FC:0037/0038).

10. 10

    Start the engine and verify that the instrument panel is successfully monitoring the engine temperature

    without throwing the 0.1.56 code.