Potential malfunctions

The following possible defects and malfunctions can be identified based on DTC entries:

• Controlled load reduction at high temperatures: The alternator is overloaded and the alternator voltage is reduced as a precautionary measure; it remains at a reduced level until the alternator has cooled. The charge indicator lamp does not light up
• Mechanical fault: The alternator is physically seized or the belt drive is no longer operational.
• Electrical fault: Defective field diodes, interruption in generation of field current, overvoltage.
• Communications failure: Defect in wiring between engine-management control unit and alternator.

The following cannot be detected: Open winding or short circuit