Engine Electrical System -- Repair M4 (G82 & G83)

• 12 00 Engine Electrical System
  • Instructions for removal and replacement of control units (M4 2021-2023)
  • Notes on starting assistance (M4 2021-2023)
• 12 12 Ignition Wire, Spark Plugs
  • 12 12 011 Removing and installing/replacing all spark plugs (M4 2021-2023)
    • Removing all spark plugs
    • Installing all spark plugs
• 12 13 Ignition Coil
  • 12 13 511 Replacing an ignition coil (after vehicle diagnosis) (M4 2021-2023)
    • Removing the ignition coil
    • Install ignition coil
  • 12 13 512 Replacing more than one ignition coil (M4 2021-2023)
    • Removing all ignition coils
    • Installing all ignition coils
• 12 14 Electronic Switching Or Control Units
  • 12 14 521 Replacing the crankshaft sensor (after vehicle diagnosis) (M4 2021-2023)
    • Removing the crankshaft sensor
    • Installing the crankshaft sensor
  • 12 14 523 Replacing the camshaft position sensor of the intake camshaft (after vehicle diagnosis) (M4 2021-2023)
    • Removing camshaft position sensor for the intake camshaft
    • Installing camshaft position sensor of intake camshaft
  • 12 14 524 Replacing the camshaft position sensor of the exhaust camshaft (after vehicle diagnosis) (M4 2021-2023)
    • Remove the camshaft position sensor of the exhaust camshaft
    • Installing the camshaft position sensor of the exhaust camshaft
  • 12 14 550 Replacing the Digital Motor Electronics control unit (after vehicle diagnosis) (M4 2021-2023)
    • Removing the DME control unit
    • Installing the DME control unit
  • 12 14 602 Replacing knock sensor (following vehicle diagnosis) (cylinders 1+3) (M4 2021-2023)
    • Removing the knock sensor of cylinders 1 to 3
    • Installing knock sensor of cylinders 1 to 3
  • 12 14 604 Replacing knock sensor (following vehicle diagnosis) (cylinders 4+6) (M4 RWD models, 2021-2023)
    • Removing the knock sensor of cylinders 4 to 6
    • Installing the knock sensor of cylinders 4 to 6
  • 12 14 700 Coding the control unit (DME/DDE) (M4 2021-2023)
  • 12 14 705 Programming the control unit (DME/DDE) (M4 2021-2023)
  • 12 14 604 Replacing knock sensor (following vehicle diagnosis) (cylinders 4+6) (M4 AWD models, 2021-2023)
    • Removing the knock sensor of cylinders 4 to 6
    • Installing the knock sensor of cylinders 4 to 6
• 12 31 Alternator With Drive And Attachment
  • 12 31 020 Removing and installing/replacing alternator (M4 2021-2023)
    • Removing the alternator
    • When replacing the alternator: Remounting the belt tensioner of the alternator
    • Install alternator
• 12 41 Starter With Attachment
  • 12 41 020 Removing and installing/replacing starter motor (M4 2021-2023)
    • Removing starter motor
    • Replace starter
    • Installing starter motor
  • 12 41 041 Replacing the engagement solenoid switch (M4 2021-2023)
• 12 42 Starter Line
  • 12 42 540 Replacing the safety battery terminal (SBK) (M4 2021-2023)
  • 12 42 651 Removing and installing/replacing the positive battery cable remote positive terminal alternator (after vehicle diagnosis) (M4 RWD models, 2021-2023)
    • Removing the positive battery cable from the alternator to the auxiliary terminal for jump starting
    • Installing the positive battery cable from the alternator to the auxiliary terminal for jump starting
  • 12 42 652 Removing and installing/replacing the positive battery cable remote positive terminal starter (after vehicle diagnosis) (M4 2021-2023)
    • Removing the positive battery cable from the starter to remote positive terminal
    • Installing the positive battery cable from the starter motor to the auxiliary terminal for jump starting
  • 12 42 651 Removing and installing/replacing the positive battery cable remote positive terminal alternator (after vehicle diagnosis) (M4 AWD models, 2021-2023)
    • Removing the positive battery cable from the alternator to the auxiliary terminal for jump starting
    • Installing the positive battery cable from the alternator to the auxiliary terminal for jump starting
• 12 51 Engine Wiring Harness
  • 12 51 210 Replacing the wiring harness section for injectors and ignition coils (M4 2021-2023)
    • Removing the wiring harness section for the ignition and injectors
    • Installing the wiring harness section for the ignition and injectors
  • 12 51 235 Remove and install/replace Module 1, sensor system engine wiring (M4 RWD models, 2021-2023)
    • Removing the engine wiring harness for sensor system 1
    • Installing the engine wiring harness for sensor system 1
  • 12 51 240 Remove and install/replace Module 2, sensor system engine wiring (M4 2021-2023)
    • Removing the engine wiring harness for sensor system 2
    • Installing the engine wiring harness for the sensor system 2
  • 12 51 245 Remove and install/replace transmission module engine wiring (M4 Base Coupe RWD)
    • Removing the wiring harness section of the transmission wiring harness
    • Install the wiring harness section of the transmission wiring harness
  • 12 51 245 Remove and install/replace transmission module engine wiring (M4 Competition Coupe RWD, M4 CSL Coupe RWD)
    • Removing the wiring harness section of the transmission wiring harness
    • Install the wiring harness section of the transmission wiring harness
  • 12 51 235 Remove and install/replace Module 1, sensor system engine wiring (M4 AWD models, 2021-2023)
    • Removing the engine wiring harness for sensor system 1
    • Installing the engine wiring harness for sensor system 1
  • 12 51 245 Remove and install/replace transmission module engine wiring (M4 AWD models, 2021-2023)
    • Removing the wiring harness section of the transmission wiring harness
    • Install the wiring harness section of the transmission wiring harness
• 12 61 Oil Pressure, Oil Temp, Oil Level Check
  • 12 61 280 Removing and installing/replacing oil pressure switch (M4 2021-2023)
    • Removing the oil pressure switch
    • Installing the oil pressure switch
  • 12 61 285 Replacing the oil level sensor for engine oil (M4 2021-2023)
    • Removing the oil-level sensor
    • Installing the oil-level sensor
• 12 63 Switch And Relay
  • 12 63 586 Replacing power distribution box (after vehicle diagnosis) (M4 2021-2023)
    • Remove the integrated power supply module (PDM)
    • Install the integrated power supply module (PDM)
• 12 90 E-Box
  • 12 90 150 Remove and install/replace control unit box (M4 2021-2023)
    • Removing the control unit holder
    • Installing the control unit holder