Engine Electrical System - Repair

• Troubleshooting
  • 12 00... Instructions for disconnecting and connecting battery
    • Notes
    • Vehicles with a two-battery system
  • 12 13 Notes on checking ignition system
• Ignition, distributor
  • 12 11 094 Replacing both distributor caps (M 73)
  • 12 11 096 Replacing left distributor cap (M73)
  • 12 11 098 Replacing right distributor cap (M73)
  • 12 11 114 Replacing both distributor rotors (M73)
  • 12 11 116 Replacing left distributor rotor (M73)
  • 12 11 118 Replacing right distributor rotor (M73)
  • 12 11 206 Checking left distributor cap, ignition leads and ignition line connector (M73)
  • 12 11 208 Checking right distributor cap, ignition leads and ignition line connector (M73)
• Ignition wires, spark plugs
  • 12 12 011 Replacing all spark plugs (M73)
  • 12 12 036 Replacing all left ignition leads (M73)
  • 12 12 038 Replacing all right ignition leads (M73)
  • 12 12 072 Replace one spark plug connector (M40, M42, M43, M44, M73).
  • 12 12 151 Replacing one suppressor plug (M73)
• Ignition Coil
  • 12 13 Notes on checking ignition system
  • 12 13... Checking secondary signal for stationary ignition distribution
  • 12 13... Normal oscillogram (M, S, W engines only)
  • 12 13 009 Checking ignition coils (M73)
  • 12 13 009 Checking ignition coils (secondary coil)
  • 12 13 511 Replacing ignition coil (M73)
• Electronic Switching
  • 12 14 500 Removing and installing / replacing both control units (Digital Motor Electronics) (M73)
  • 12 14 518 Replacing impulse sensor (cylinder bank 7-12) (M73)
  • 12 14 519 Replacing impulse sensor (cylinder bank 1-6) (M73)
  • 12 14 525 Replacing sensor for cylinder recognition (camshaft sensor) (M73)
  • 12 14 570 Replacing control unit for electric catalytic converter (M73)
  • 12 14 610 Replacing right knock sensors (cylinder bank1-6)(M73)
  • 12 14 611 Replacing left knock sensors (cylinder bank 7-12) (M73)
  • 12 14 700 Coding control module (DME / DDE)
  • 12 14 705 Programming control unit (DME / DDE)
  • 61 35... Note on replacing codable/programmable control units
• Alternator with drive
  • 12 xx xxx Removing and installing/replacing outer jacket for alternator (M73)
  • 12 31... Replacing alternator belt pulley
  • 12 31 009 Checking alternator and regulator switch
  • 12 31 020 Removing and installing/replacing alternator (M73)
  • 12 31 020 Removing and installing/replacing alternator (liquid-cooled) (M73)
  • 12 31 230 Removing and installing / replacing mounting block for alternator (M73)
  • 12 31 400 Replacing cooling air duct for alternator (M60, M62, M73)
• Regulator
  • 12 32 501 Replacing voltage regulator (Valeo/Bosch)
• Starter with Mounting
  • 2 41... Checking components of starting motor (electric test)
  • 12 41 020 Removing and installing or replacing starter (M73)
  • 12 41 041 Replacing solenoid switch
  • 12 41 103 Disassembling and assembling starter motor
  • 12 41 513 Disassembling and assembling starter motor
  • 12 41 513 Disassembling and assembling starting motor/transmission gear
  • 12 41 551 Replacing carbon brushes
  • 12 41 551 Replacing carbon brushes (starter motor with countershaft)
• Starter Lead
  • 12 42 500 Removing and installing or replacing battery positive lead (between starter, alternator and battery positive support point) (M73)
  • 12 42 520 Removing and installing or replacing positive battery wire (between alternator and positive battery support point on cylinder head cover) (M73)
  • 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 loom
  • 12 51 001 Wiring harness - replacing engine section (M73)
• Oil pressure - oil temperature
  • 12 61 280 Removing and installing or replacing oil pressure switch (M73)
  • 12 61 285 Replacing level switch for engine oil (M73)
• Switches an relays
  • 12 63 500 Replacing temperature sensor for electronics
  • 12 63 520 Replacing main relay (for Digital Motor Electronics) (M 73)
• EML electronic engine
  • 12 70 000 Function check of Electronic Engine Power Control (EPC) (M73)
• Electronic Control Unit
  • 12 71 000 Function check of Electronic Engine Power Control (EPC)(M73)
  • 12 71 530 Removing and installing / replacing control unit for Electronic Engine Power Control (EML) (M73)
• Sensor for Control Unit
  • 12 14 570 Replacing control unit for electric catalytic converter (M73)
  • 12 72 520 Removing and installing/replacing accelerator sensor (M73)