Fendt 1.2.02 – A051 - ECU, Engine Control Unit (EDC 7 / EDC 17): B092 - Sensor, charge air pressure/temperature

The engine control unit has detected a cable break or short circuit at the boost pressure sensor, or the charge air pressure is outside the setpoint range, resulting in reduced engine power (limp mode).

• 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 300 Vario (309, 310, 311, 312)
• Fendt 400 Vario (409, 410, 411, 412)
• Fendt 700 Vario (711, 712, 714, 716)
• Fendt 800 Vario (815, 817, 818)
• Fendt 900 Vario (916, 920, 924, 926, 930, 936, 939)

1. 1

   Inspect the 4-pin connector (X1661) at the B092 sensor for corrosion, moisture, or backed-out pins, and check the wiring harness for breaks or shorts to ground.

2. 2

   With the ignition ON, check the supply voltage at the sensor connector (should be exactly 5.0 VDC).

3. 3

   Back-probe the signal wire: it should read 0 VDC with ignition ON/engine off, approx. 1.0 VDC at engine idle (800 rpm), and approx. 4.8 VDC under load.

4. 4

   Verify mechanical boost pressure (max approx. 1.6 bar) to rule out turbocharger, wastegate, or intake leak issues if the sensor is reading correctly.

1. 1

   Turn off tractor

   Turn off the tractor and ensure the ignition is completely OFF.

2. 2

   Locate sensor

   Locate the B092 charge air pressure/temperature sensor on the engine intake manifold.

3. 3

   Disconnect connector

   Disconnect the X1661 electrical connector.

4. 4

   Remove faulty sensor

   If diagnostic tests proved the sensor has a 5V supply and good ground but outputs an incorrect or dead signal, remove the faulty B092 sensor from the manifold.

5. 5

   Install new sensor

   Install the new sensor and securely reconnect the wiring harness.

6. 6

   Connect diagnostic tool

   Connect the Fendt SERDIA diagnostic tool to the tractor's diagnostic port.

7. 7

   Clear fault codes

   Navigate to the A051 Engine Control Unit and clear the stored fault codes (1.2.02 / FC:0020, 0021).

8. 8

   Test drive

   Start the engine and test drive the tractor under load to ensure full power is restored and the code does not return.