Fendt 1E.1.54 – Diesel Engine ECU (EDC 7): B086 - Rail pressure sensor (Compression test is active)

Indicates that a 'Compression test is active' and the system's 'Rail pressure monitoring is deactivated'. The B086 sensor detects the actual fuel pressure in the common rail.

• 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 (e.g., 309, 310, 311, 312)
• Fendt 400 Vario
• Fendt 500 Vario (e.g., 514, 516)
• Fendt 700 Vario (e.g., 714, 716, 718, 720)
• Fendt 800 Vario (e.g., 818, 820)
• Fendt 900 Vario

1. 1

   Verify if a technician recently initiated a compression test using the SERDIA diagnostic software

2. 2

   Check the EDC for other active faults (such as 1E.1.52 or 1E.1.53) if the engine is forcing a shutdown

3. 3

   Inspect the 3-pin connector and wiring harness to the B086 sensor for breaks or short circuits if a sensor fault is suspected

1. 1

   Connect diagnostic software

   Connect a laptop with the Fendt SERDIA diagnostic software to the tractor.

2. 2

   Access fault memory

   Access the Engine Control Unit (EDC 7) fault memory.

3. 3

   Locate internal code

   Locate the specific internal fault code FC:00AF (which corresponds to 1E.1.54).

4. 4

   Clear error

   Use the SERDIA program to manually delete/clear the error and exit the compression test mode.

5. 5

   Depressurize fuel system

   If the B086 sensor is actually faulty and requires replacement: After switching off the diesel engine, you MUST wait at least 30 seconds before starting any work on the high-pressure fuel system to allow the rail pressure to dissipate.

6. 6

   Disconnect sensor

   Disconnect the 3-pin electrical connector from the B086 rail pressure sensor.

7. 7

   Remove sensor

   Unscrew the faulty sensor from the common rail accumulator.

8. 8

   Install new sensor

   Install the new OEM pressure sensor and torque to the manufacturer's specification.

9. 9

   Reconnect wiring

   Reconnect the wiring harness.

10. 10

    Verify repair

    Use SERDIA to clear any residual fault codes and run the engine to verify there are no fuel leaks and that rail pressure reads normally (400–1600 bar).