Engine Electrical System - Repair

• Troubleshooting
  • 12 00 Contents of Engine Electrical System General
  • 12 00... Instructions for disconnecting and connecting battery
    • Notes
    • Before disconnecting battery:
    • General notes on disconnecting battery:
    • After connecting battery:
    • Vehicles with a two-battery system
• Ignition Wires, Spark Plugs
  • 12 12 011 Replacing all spark plugs
    • Special tools required:
• Ignition Coil
  • 12 13 Notes on checking ignition system
  • 12 13... Checking secondary signal for stationary ignition distribution
    • Special tools required:
  • 12 13... Normal oscillogram (M, S, W engines only)
  • 12 13 009 Checking rod-type ignition coils (M54, M56, N40, N42, N45, N46, N52, N62, N73)
    • Special tools required:
  • 12 13 511 Replacing ignition coil (M52, M52TU, S52, S50US, M54)
  • 12 13 520 Replacing a spark plug connector (M60, M62, M54)
• Electronic Switching
  • 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)
  • 12 63 520 Replacing main relay (S62, M54)
  • 61 35... Note on replacing codable/programmable control units
• Alternator With Device
  • 12 31... Replacing alternator belt pulley
    • Special tools required:
  • 12 31 009 Checking alternator and regulator switch
  • 12 31 020 Removing and installing or replacing alternator (M52, M52TU, S50US, S52, M54, M56)
    • Notes
    • Version 1
    • Version 2
• 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)
    • Notes
    • Battery in engine compartment
    • Battery in luggage compartment behind side trim panel
    • Battery in luggage compartment under floor trim panel
    • Battery in luggage compartment under spare wheel
• Engine Wiring 100M
  • 12 51 001 Replacing wiring harness section for engine (M54)
  • 12 51 100 Replacing wiring harness section for ignition coils (M54)
• Pressure Oil Temperature
  • 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 level switch for engine oil (Z3 M54)
  • 12 61 285 Replacing oil level sensor
• Switches and Relays
  • 12 63 520 Replacing main relay (S62, M54)