CLAAS Id7745h / 7745h (636 10) – ENG (A15) - Engine Control Unit: Format of the position signal of the high pressure pump non valid.

The engine control unit has detected that the input configuration or signal pattern from the high-pressure fuel pump position sensor is incorrect or invalid. Symptoms include extended engine starting time, shuddering or stalling when triggered, and the ECU defaulting to the crankshaft position sensor (B231).

• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850
• Arion 410
• Arion 430
• Arion 510
• Arion 530
• Arion 550
• Arion 610
• Arion 620
• Arion 630
• Arion 640
• Ares 806

1. 1

   Check the physical condition of the B232 position sensor on the high-pressure pump.

2. 2

   Inspect the wiring harness between the B232 sensor and the ENG (A15) module for dirty, worn, or badly positioned terminals.

3. 3

   Check for continuity between the sensor and the ECU.

4. 4

   Test for short-circuits to ground or open circuits.

5. 5

   Verify the sensor's power supply (voltage/ground) and measure the sensor's resistance and frequency output while cranking.

6. 6

   Verify the mechanical adjustment/timing of the sensor.

1. 1

   Disconnect Power

   Turn off the master switch and disconnect the battery before servicing engine sensors.

2. 2

   Repair Wiring

   If the diagnostic checks reveal a wiring fault, repair the defective connection(s) or replace the damaged harness section.

3. 3

   Replace the Sensor

   If the wiring is intact but the signal remains invalid, the B232 sensor itself is faulty and must be replaced.

4. 4

   Mechanical Timing

   When installing the new sensor/pump holder, note the adjustment marking on the spur gear. This marking must line up precisely with the upper dead center (UDC) on cylinder 1.

5. 5

   Clear Codes

   Reconnect the battery, turn on the ignition, and use the CLAAS Metadiag tool (or equivalent diagnostic scanner) to clear the active and memorized anomaly codes from the ENG (A15) module.

6. 6

   Test Run

   Start the engine to verify that the extended cranking symptom is resolved and the code does not return.