Engine Electrical System - Repair Instructions

• Troubleshooting
  • 12 00 Contents of Engine Electrical System General
    • Notes
    • Working On Ignition System
    • Removing And Installing Electronic Control Units
    • Welding Work (Overload Protection Of Control Units)
    • Disconnecting And Connecting Battery
    • Disconnecting And Connecting Test Equipment
    • Component Inspection
    • External Jump-Starting Aid
      • Notes
      • Preparation
      • Carrying Out
    • Compression Testing
  • 12 00... Instructions for disconnecting and connecting battery
• 12 13 Notes on checking ignition system
• Ignition Coil
  • Troubleshooting
    • Fault In Fuel Injection System
    • Spark Plug Faults
    • Ignition Coil Faults
    • Further Fault Patterns With Evaluation
    • Additional Fault Notes For Troubleshooting
  • Oscillograms
    • Normal Oscillogram (M, S, W Engines Only)
    • Oscillograms of ignition coils from different manufacturers
    • 12 13... Checking secondary signal for stationary ignition distribution
      • Notes
      • Engine Test Step 10
• Ignition coil
  • 12 13 Notes on checking ignition system
  • 12 13 009 Checking rod-type ignition coils (M54, M56, N40, N42, N45, N46, N52, N62, N73)
    • Notes
    • Procedure
  • 12 13 511 Replacing ignition coil (M52, M52TU, S52, S50US, M54)
  • 12 13 520 Replacing a spark plug connector (M60, M62, M54)
• Ignition wires, spark plugs
  • 12 12 011 Replacing all spark plugs
    • Notes
    • Procedure
• Electronic Switching Or Control Unit
  • 12 14 521 Replacing pulse generator on crankshaft (M54/M56)
  • 12 14 523 Replacing pulse generator on inlet camshaft (M52TU/M54/M56)
  • 12 14 524 Replacing pulse generator on exhaust camshaft (M52TU, M54, M56)
  • 12 14 550 Replacing control unit (DME) (M52, M62, M54)
  • 12 14 600 Replacing knock sensor (M52TU, M54, M56)
  • 12 14 700 Coding control module (DME/DDE)
  • 12 14 705 Programming control unit (DME/DDE)
• Alternator with drive
  • 12 31... Replacing alternator belt pulley
    • Notes
    • Procedure
  • 12 31 009 Checking alternator and regulator switch
    • Notes
    • From E46/E39 With Multifunction Regulator
      • Notes
      • Oscillogram For A Fault-Free Alternator:
      • Oscillogram For A Faulty Alternator:
  • 12 31 020 Removing and installing or replacing alternator (M52, M52TU, S50US, S52, M54, M56)
• Regulator
  • 12 32 501 Replacing voltage regulator (Valeo/Bosch)
• Starter with mounting
  • 12 41 020 Removing and installing/replacing starter motor (M54)
  • 12 41 041 Replacing solenoid switch
• Starter lead
  • 12 42 510 Replacing battery positive lead (between starter motor and battery positive support point) (M54)
  • 12 42 530 Replacing battery positive lead (between starter motor and alternator) (M54/M56)
  • 12 42 540 Replacing safety battery terminal (SBK)
• Engine wiring loom
  • 12 51 001 Replacing wiring harness section for engine (M54)
  • 12 51 100 Replacing wiring harness section for ignition coils (M54)
• Oil Pressure & Oil Temperature Gauge
  • 12 61 250 Removing and installing/replacing oil temperature switch (M52TU, M54, M56)
  • 12 61 280 Removing and installing/replacing oil pressure switch (M52TU, M54, M56)
  • 12 61 285 Replacing level switch for engine oil
  • 12 61 285 Replacing oil level sensor
• Switches and Relays
  • 12 63 520 Replacing main relay (S62, M54)