2013 Mini Cooper JCW GPFACTORY OEM SERVICE PROCEDURE

Section 132 (Generators & Regulators): Testing: Generator

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  1. Check for correct corrections on charged battery, generator and starter motor. Make sure of good ground connection between engine and body. Make sure of good tension on ribbed V-belt.
  2. Read out DME/DDE fault memory.
  3. Connect diagnosis tester. Search down in the following menus:
    • FUNCTION SELECTION
    • COMPLETE VEHICLE
    • DRIVE
    • VOLTAGE AND CURRENT REGULATION
    • VOLTAGE AND CURRENT GENERATION
    Follow instructions in diagnostic program. To diagnose oscillograms for each fault, see GENERATOR OSCILLOGRAMS  . If generator is faulty, repair or replace it. To replace, see GENERATOR  under REMOVAL & INSTALLATION.
GENERATOR OSCILLOGRAMS

Fault Oscillogram
Fault-Free See Fig 1
One Phase Interrupted See Fig 2
Internal Fault See Fig 3
Open Circuit In Negative Diode See Fig 4
Short Circuit In Positive Diode See Fig 5
Open Circuit In Positive Diode See Fig 6
Open Circuit In Exciter Diode See Fig 7
Fig 1: Identifying Oscillogram For A Fault-Free Generator
G00301749Courtesy of BMW OF NORTH AMERICA, INC.
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When to See a Mechanic

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

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