CLAAS Id774Fh / 774Fh (641 16) – ENG (A15) - Engine Module: Temperature of the turbocharger actuator averagely high.

The internal printed circuit board (PCB) of the turbocharger's Variable Geometry Turbine (VGT) actuator is overheating. This can be caused by a failure in the actuator's cooling circuit, missing/damaged heat shields, restricted airflow, or excessive Exhaust Gas Recirculation (EGR).

• CLAAS Arion series (e.g., Arion 640-510)
• CLAAS Axion series (e.g., Axion 850, Axion 800)

1. 1

   Inspect the cooling circuit of the actuator (if the specific model's actuator is liquid-cooled)

2. 2

   Verify the presence and structural integrity of the heat shields surrounding the turbocharger and actuator

3. 3

   Check for restricted airflow or excessive EGR operation, which can artificially elevate temperatures around the VGT actuator

4. 4

   Inspect the Turbocharger Actuator (M37) and the turbocharger assembly itself for mechanical binding or damage

5. 5

   Verify the wiring connections to the Engine Module ENG (A15)

1. 1

   Visual & Physical Inspection

   Resolve any external issues causing the overheating. Replace missing heat shields, clear airflow restrictions, and repair the actuator cooling lines if applicable.

2. 2

   Actuator Replacement

   If the internal PCB of the actuator is permanently damaged from overheating, the VGT actuator (M37) must be replaced.

3. 3

   Electronic Calibration

   If the VGT actuator (M37) is replaced with a new unit, it is mandatory to perform an electronic calibration using the CLAAS CDS (Computer Diagnostic System) software.

4. 4

   Clear Codes

   After calibration, clear the fault codes via the CLAAS CAN Bus network. If power remains restricted, an ENG (A15) module reset/recalibration may be required.