Fendt 1E.1.B5 – A051 - ECU, engine control unit (EDC 7): No engine temperature CAN message

The engine control unit is not receiving the expected temperature data signal over the CAN bus network from the engine coolant temperature sensor (B089).

• 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
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III)

1. 1

   Locate the engine coolant temperature sensor (B089) on the engine block and check the 2-pin connector for corrosion, moisture, or backed-out pins.

2. 2

   Inspect the wiring harness between the temperature sensor and the A051 (EDC 7) control unit for cable breaks, chafing, or short circuits.

3. 3

   Verify the integrity of the CAN bus lines communicating with the EDC 7 module, as the fault specifically notes a missing CAN message.

4. 4

   Connect the Fendt SERDIA diagnostic software (internal FC: 0071) and verify live data for the coolant temperature to see if it reads out of bounds (e.g., -40°C or an implausibly high value).

1. 1

   Disconnect battery

   Disconnect the battery to prevent electrical spikes.

2. 2

   Repair wiring harness

   If the wiring harness is damaged, repair the broken wires or replace the damaged connector pigtail.

3. 3

   Remove faulty sensor

   If the wiring tests good (continuity is present and there are no shorts to ground), remove the faulty engine temperature sensor. Note: Be prepared to catch a small amount of escaping coolant.

4. 4

   Install new sensor

   Install the new engine temperature sensor and torque to the manufacturer's specification.

5. 5

   Reconnect components

   Reconnect the sensor harness and reconnect the battery.

6. 6

   Clear fault code

   Connect the SERDIA diagnostic tool and perform the 'delete error' (clear fault) procedure for FC:0071.

7. 7

   Verify repair

   Run the tractor and verify that the engine temperature registers correctly on the instrument cluster and that the fault code does not return.