CLAAS Id774Bh / 774Bh (637 10) – ENG (A15) Engine Module / Engine Calculator: Format of the crankshaft position signal non valid.

When this fault is triggered, the engine calculator initiates a protective derate, reducing engine power by 20% per minute until it reaches 50% of its nominal power (power is also recovered at a rate of 20% per minute once the fault is resolved).

• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850
• Arion 410
• Arion 430
• Arion 510
• Arion 520
• Arion 530
• Arion 550
• Arion 610
• Arion 620
• Arion 640
• Arion 650

1. 1

   Identify the Sensor: The crankshaft position sensor is designated as component B231 in CLAAS wiring diagrams. It indicates the engine's rotation speed and the precise crankshaft position (Top Dead Center of cylinders 1 and 6).

2. 2

   Check Backup Signal: If the signal from B231 is absent or invalid, the engine management system will attempt to use the signal from sensor B232 (the high-pressure pump / timing position sensor) to manage engine speed. Verify if B232 is functioning correctly to keep the machine limping.

3. 3

   Inspect Wiring: Check the wiring harness leading to the B231 sensor for chafing, shorts, or loose connections.

4. 4

   Check the Module: Verify the connections at the ENG (A15) engine module.

1. 1

   Locate the crankshaft position sensor (B231) on the engine block near the timing cover.

   Locate the crankshaft position sensor (B231) on the engine block near the timing cover.

2. 2

   Remove the bolts securing the retaining clamps on the wiring harness for the crankshaft position sensor.

   Remove the bolts securing the retaining clamps on the wiring harness for the crankshaft position sensor.

3. 3

   Carefully pull and remove the faulty crankshaft position sensor (B231) from its mounting port.

   Carefully pull and remove the faulty crankshaft position sensor (B231) from its mounting port.

4. 4

   Lubricate the O-ring on the new sensor (if applicable) and insert the new crankshaft position sensor (B231) into the port.

   Lubricate the O-ring on the new sensor (if applicable) and insert the new crankshaft position sensor (B231) into the port.

5. 5

   Fit and tighten the bolts securing the clamps on the wiring harness for the sensor, ensuring you respect the standard torque specifications for your specific engine model.

   Fit and tighten the bolts securing the clamps on the wiring harness for the sensor, ensuring you respect the standard torque specifications for your specific engine model.

6. 6

   Clear the fault codes from the ENG (A15) module and test run the engine to ensure full power is restored and the 50% derate is lifted.

   Clear the fault codes from the ENG (A15) module and test run the engine to ensure full power is restored and the 50% derate is lifted.