Engine Electrical System - Repair - E91

• 1200 Troubleshooting
  • 61 20... Battery replacement information
    • Notes
    • Vehicles with energy management systems (IBS, power module): Register battery replacement
  • 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
  • 12 00... Instructions for working on the ignition system
  • 12 13 Notes on checking ignition system
  • 61 00... Notes on handling wiring harnesses and cables
    • The following applies in general
    • The following additionally applies
  • 12 00... Notes/information on removing and installing control units
  • 12 00... Notes/information on start assistance (jump starting)
    • Notes
    • Preparation
    • Operation
    • Risk of explosion!
  • 00 Safety information for working on vehicles with automatic engine start-stop function (MSA)
    • Notes
    • Observe safety precautions when working on MSA vehicles
    • MSA function is deactivated by
    • When working with diagnosis tools
• 1212 Ignition Wires, Spark Plugs
  • 12 12 011 Replace all spark plugs (N40, N42, N45, N45T, N46, N46T, N51, N52, N52K)
    • Necessary preliminary work
• 1213 Ignition Coil
  • 12 13 009 Checking rod-type ignition coils (M54, M56, N40, N42, N43, N45, N46, N52, N62, N62TU, N73)
    • Necessary preliminary tasks
    • Secondary measurement
    • Primary measurement
    • M54/M56/N40/N42/N45/N46/N62/N73
  • 12 13 Notes on checking ignition system
  • 12 13 511 Replacing ignition coils (N52, N52K, N51)
    • Necessary preliminary tasks
• 1214 Electronic Switching Or Control Units
  • 12 14 700 Coding control module (DME/DDE)
    • Switch on ignition
  • 12 14 705 Programming control unit (DME/DDE)
    • Switch off ignition
  • 12 14 600 Removing/replacing knock sensors (N52, N52K, N51)
    • Notes
    • Necessary preliminary tasks
    • Replace aluminium screws
  • 12 14 550 Replacing control unit (DME)
    • Necessary preliminary work
  • 12 14 521 Replacing crankshaft pulse generator (N52, N52K, N51, N53)
    • Notes
    • Necessary preliminary tasks
  • 12 14 524 Replacing exhaust camshaft pulse generator (N52, N52K, N51, N53)
    • Notes
    • Necessary preliminary tasks
  • 12 14 523 Replacing inlet camshaft pulse generator (N52, N52K, N51, N53)
    • Notes
    • Necessary preliminary tasks
• 1231 Alternator With Drive And Mounting
  • 12 31 009 Checking alternator (BSD)
    • Necessary preliminary tasks
  • 12 31 020 Removing and installing or replacing alternator (N52, N52K, N51, N53)
    • Notes
    • Necessary preliminary tasks
  • 12 31... Replacing alternator belt pulley
  • 12 31... Replacing alternator belt pulley (with overrunning clutch)
• 1232 Regulator
  • 12 32 501 Replacing voltage regulator
    • Necessary preliminary tasks
• 1241 Starter With Mounting
  • 12 41 020 Removing and installing/replacing starter (N52, N52K, N51, N53, N54)
    • Notes
    • Necessary preliminary tasks
  • 12 41 041 Replacing solenoid switch
• 1242 Starter Lead
  • 12 42 500 Replacing battery positive lead (between starter, alternator and battery positive terminal)
    • Necessary preliminary tasks
  • 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
• 1251 Engine Wiring Loom
  • 12 51 001 Replacing wiring harness section for engine (N52, N52K)
    • Notes
    • Necessary preliminary tasks
    • Illustration shows cylinder head cover
  • 12 51 001 Replacing wiring harness section for engine (N52K, N51)
    • Notes
    • Necessary preliminary tasks
  • 12 51 100 Replacing wiring harness section for ignition coil (N52, N52K)
    • Notes
    • Necessary preliminary tasks
    • Illustration shows cylinder head cover
  • 12 51 100 Replacing wiring harness section for ignition coil (N52K, N51)
    • Notes
    • Necessary preliminary tasks
• 1261 Oil Pressure/Oil Temperature/Oil Gauge
  • 12 61 285 Removing and installing/replacing oil level sensor for engine oil (N52, N52K, N51, N46, N54, N53)
    • Notes
    • Necessary preliminary work
    • Only if the holder for earth strap is installed!
  • 12 61 280 Removing and installing/replacing oil pressure sensor (N52, N52K, N51, N54, N53)
    • Necessary preliminary tasks
    • Installation location
• 1290 Control Unit Box
  • 12 90... Removing and installing/replacing electronics box
    • Notes
    • Necessary preliminary tasks
    • Replacement
  • 12 90 100 Replacing fan for electronics box
    • Necessary preliminary tasks