Engine Electrical System - Repair - E90/E91, Z4

• 00 Troubleshooting
  • 12 00 Contents of Engine Electrical System General
  • 12 00 ... Instructions for disconnecting and connecting battery
    • Notes
    • Vehicles with a two-battery system
  • 12 00 ... Instructions for working on the ignition system
  • 12 00 ... Instructions for removing and installing electronic control units
  • 12 00 ... Instructions for welding work (overload protection of control units)
  • 12 00 ... Instructions for connecting and disconnecting test units
  • 12 00 ... Instructions on component testing
  • 12 00 ... Instructions on starting aid
  • 12 00 ... Instructions on compression testing
  • 12 13 Notes on checking ignition system
• 12 Ignition wires, spark
  • Firing Order
  • 12 12 011 Replacing all spark plugs (N42, N40, N46, N45, N52, N52K, N51)
• 13 Ignition coil
  • 12 13 Notes on checking ignition system
  • 12 13 009 Checking rod-type ignition coils (M54, M56, N40, N42, N43, N45, N46, N52, N62, N62TU, N73)
  • 12 13 511 Replacing ignition coils (N52, N52K, N51)
• 14 Electronic switching
  • 12 14 521 Replacing crankshaft pulse generator (N52, N52K, N51, N53)
  • 12 14 523 Replacing inlet camshaft pulse generator (N52, N52K, N51, N53)
  • 12 14 524 Replacing exhaust camshaft pulse generator (N52, N52K, N51, N53)
  • 12 14 550 Replacing control unit (DME)
  • 12 14 600 Removing/replacing knock sensors (N52, N52K, N51)
  • 12 14 700 Coding control module (DME / DDE)
  • 12 14 705 Programming control unit (DME / DDE)
  • 12 90 ... Removing and installing/replacing electronics box
  • 12 90 100 Replacing fan for electronics box
  • 61 14 ... Removing and installing/replacing engine compartment B+ terminal
• 31 Alternator with drive
  • 12 31 ... Replacing alternator belt pulley
  • 12 31 009 Checking alternator (BSD)
  • 12 31 020 Removing and installing or replacing alternator (N52, N52K, N51, N53)
• 41 Starter with mounting
  • 12 41 020 Removing and installing/replacing starter motor (N52, N52K, N51, N53)
  • 12 41 041 Replacing solenoid switch
• 42 Starter lead
  • 12 42 500 Replacing battery positive lead (between starter, alternator and battery positive terminal)
• 51 Engine wiring loom
  • 12 51 001 Replacing wiring harness section for engine (N52)
  • 12 51 100 Replacing wiring harness section for ignition coil (N52)
• 61 Oil pressure-Oil temperature
  • 12 61 280 Removing and installing/replacing oil pressure sensor (N52, N52K, N51, N54, N53)
  • 12 61 285 Replacing engine oil level sensor (N52, N52K, N51, N46, N54, N53)
• 90 Control unit box
  • 12 90 ... Removing and installing/replacing electronics box
  • 61 14 ... Removing and installing/replacing engine compartment B+ terminal