2002 BMW 745LiFACTORY OEM SERVICE PROCEDURE

Possible Faults

NOTE: Coil interruption or short-circuit cannot be detected.

The following faults can be distinguished from fault entries:

  • High temperature control occurs when generator is overloaded. To be safe, generator voltage is reduced until generator has cooled down again. Charge indicator lamp does not light up.
  • Mechanical fault occurs when generator is mechanically blocked or belt drive has failed.
  • Electrical fault occurs when there is an exciter diode defect, excite interruption or overvoltage due to controller defect.
  • Communication failure occurs when there is a wire defect between engine control and generator.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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