CLAAS Id771Fh / 771Fh (103 05) – ENG (A15) - Engine Module: Intensity of the turbocharger speed sensor low.

The engine control module is detecting that the signal intensity (voltage/current) from the turbocharger speed sensor is too low. This typically indicates an open circuit, a short circuit to ground, or a completely failed sensor. The engine continues to run normally, but the engine control module ignores the information delivered by the sensor in error, falling back to default mapping for fuel delivery.

• Arion 640
• Arion 630
• Arion 620
• Arion 610
• Arion 550
• Arion 540
• Arion 530
• Arion 510
• Axion 850
• Axion 840
• Axion 830
• Axion 810
• Axion 800

1. 1

   Inspect the turbocharger speed sensor (Component designation: B226) for physical damage or loose connections.

2. 2

   Test the wiring harness connecting the B226 sensor to the ENG (A15) module. You are specifically looking for an open circuit (broken wire) or a short circuit.

3. 3

   Verify the pin connections at the engine module ENG (A15) to ensure there is no corrosion or pin push-out.

1. 1

   Locate the turbocharger speed sensor (B226) on the compressor housing of the turbocharger.

   Locate the turbocharger speed sensor (B226) on the compressor housing of the turbocharger.

2. 2

   Disconnect the sensor pigtail and inspect the electrical connector for moisture, dirt, or corrosion. Clean if necessary.

   Disconnect the sensor pigtail and inspect the electrical connector for moisture, dirt, or corrosion. Clean if necessary.

3. 3

   Using a multimeter, perform a continuity test on the wiring harness between the sensor connector and the ENG (A15) module to rule out a broken wire.

   Using a multimeter, perform a continuity test on the wiring harness between the sensor connector and the ENG (A15) module to rule out a broken wire.

4. 4

   If the wiring harness tests good (no open or short circuits), the turbocharger speed sensor (B226) has failed internally and must be replaced.

   If the wiring harness tests good (no open or short circuits), the turbocharger speed sensor (B226) has failed internally and must be replaced.

5. 5

   Remove the retaining bolt for the speed sensor and carefully pull the sensor out of the turbocharger housing.

   Remove the retaining bolt for the speed sensor and carefully pull the sensor out of the turbocharger housing.

6. 6

   Install the new OEM speed sensor, torque the retaining bolt to spec, and reconnect the wiring harness.

   Install the new OEM speed sensor, torque the retaining bolt to spec, and reconnect the wiring harness.

7. 7

   Connect the CLAAS Diagnostic System (CDS) to clear the Id771Fh / 103 05 fault code.

   Connect the CLAAS Diagnostic System (CDS) to clear the Id771Fh / 103 05 fault code.

8. 8

   Run the machine and verify via live data that the turbocharger speed (rpm) is now registering correctly.

   Run the machine and verify via live data that the turbocharger speed (rpm) is now registering correctly.