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Section 132 (Generators & Regulators): Testing: Generator

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 BMW 745i, 2004 BMW 745Li, 2003 BMW 745i, 2003 BMW 745Li, and 2002 BMW 745i. However, it is still accessible from the selected car via links, so may be relevant.
  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.
Fig 2: Identifying Oscillogram For One Phase Interrupted
G00301750Courtesy of BMW OF NORTH AMERICA, INC.
Fig 3: Identifying Oscillogram For Internal Fault
G00301751Courtesy of BMW OF NORTH AMERICA, INC.
Fig 4: Identifying Oscillogram For Open Circuit In Negative Diode
G00306585Courtesy of BMW OF NORTH AMERICA, INC.
Fig 5: Identifying Oscillogram For Short Circuit In Positive Diode
G00306586Courtesy of BMW OF NORTH AMERICA, INC.
Fig 6: Identifying Oscillogram For Open Circuit In Positive Diode
G00306587Courtesy of BMW OF NORTH AMERICA, INC.
Fig 7: Identifying Oscillogram For Open Circuit In Exciter Diode
G00306588Courtesy of BMW OF NORTH AMERICA, INC.
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