Engine Electrical System -- Repair (G14, G15, & G16)

• 12 00 General Information
  • Instructions for removal and replacement of control units
  • Notes on starting assistance
• 12 12 Spark Plugs
  • 12 12 011 Removing and installing/replacing all spark plugs (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing all spark plugs
    • Installing all spark plugs
  • 12 12 011 Removing and installing/replacing all spark plugs (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Replacing all spark plugs
• 12 13 Ignition Coils
  • 12 13 511 Replacing an ignition coil (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the ignition coil
    • Install ignition coil
  • 12 13 506 Replacing an ignition coil (following vehicle diagnosis) (right) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the ignition coil of cylinder bank 1
    • Installing the ignition coil of cylinder bank 1
  • 12 13 507 Replacing an ignition coil (after vehicle diagnosis) (left) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing ignition coil of cylinder bank 2
    • Installing the ignition coil of cylinder bank 2
  • 12 13 512 Replacing more than one ignition coil (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the ignition coil of cylinder bank 1
    • Installing the ignition coil of cylinder bank 1
    • Removing ignition coil of cylinder bank 2
    • Installing the ignition coil of cylinder bank 2
• 12 14 Engine Control Module, Sensors
  • 12 14 521 Replacing the crankshaft sensor (after vehicle diagnosis) (840i coupe/convertible/Gran Coupe sedan)
    • Removing the crankshaft sensor
    • Installing the crankshaft sensor
  • 12 14 523 Replace intake camshaft sensor (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove camshaft position sensor for the intake camshaft
    • Installing camshaft position sensor of intake camshaft
  • 12 14 524 Replace exhaust camshaft sensor (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the camshaft position sensor of the exhaust camshaft
    • Installing the camshaft position sensor of the exhaust camshaft
  • 12 14 550 Replacing the engine control module (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the DME control unit
    • Installing the DME control unit
  • 12 14 602 Replacing knock sensor (following vehicle diagnosis) (cylinders 1+3) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • 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) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • 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)
  • 12 14 705 Programming the control unit (DME)
  • 12 14 521 Replacing the crankshaft sensor (840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the crankshaft sensor
    • Installing the crankshaft sensor
  • 12 14 512 Replace left exhaust camshaft sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the exhaust camshaft sensor of cylinder bank 2
    • Installing the exhaust camshaft sensor of cylinder bank 2
  • 12 14 513 Replace right exhaust camshaft sensor (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing exhaust camshaft sensor of cylinder bank 1
    • Installing exhaust camshaft sensor of cylinder bank 1
  • 12 14 521 Replacing the crankshaft sensor (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the crankshaft sensor
    • Installing the crankshaft sensor
  • 12 14 522 Replace left intake camshaft sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the intake camshaft sensor of cylinder bank 2
    • Install the intake camshaft sensor of cylinder bank 2
  • 12 14 526 Replace right intake camshaft sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing intake camshaft sensor of cylinder bank 1
    • Installing intake camshaft sensor of cylinder bank 1
  • 12 14 555 Replacing the engine control module for cyl. 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the DME control unit of cylinders 1 to 4
    • Install the DME control unit of cylinders 1 to 4
  • 12 14 556 Replacing the engine control module for cyl. 5-8 (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the DME control unit of cylinders 5 to 8
    • Install the DME control unit of cylinders 5 to 8
  • 12 14 610 Replacing knock sensor(s) right (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the knock sensors on the right
    • Install the knock sensors on the right
  • 12 14 611 Replace the left knock sensor(s) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the left knock sensors
    • Installing the left knock sensors
• 12 31 Alternator
  • 12 31 020 Removing and installing/replacing alternator (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the alternator
    • Installing the alternator
  • 12 31 020 Removing and installing/replacing alternator (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the alternator
    • Install alternator
  • 12 32 501 Replacing the voltage regulator for the alternator (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Replacing the alternator speed governor
• 12 41 Starter Motor
  • 12 41 020 Removing and installing/replacing starter motor (840i coupe/convertible/Gran Coupe sedan)
    • Removing starter motor
    • Replace starter
    • Installing starter motor
  • 12 41 041 Replacing the engagement solenoid switch
  • 12 41 020 Removing and installing/replacing starter motor (840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing starter motor
    • Installing starter motor
  • 12 41 020 Removing and installing/replacing starter motor (M850i xDrive coupe and Gran Coupe sedan)
    • Removing starter motor
    • When replacing the starter motor: Remount components
    • Installing starter motor
  • 12 41 020 Removing and installing/replacing starter motor (M850i xDrive convertible)
    • Removing starter motor
    • When replacing the starter motor: Remount components
    • Installing starter motor
• 12 42 Starter Positive Battery Cable
  • 12 42 540 Replacing the safety battery terminal (SBK)
  • 12 42 651 Removing and installing/replacing the positive battery cable remote positive terminal alternator (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the positive battery cable from the alternator to the auxiliary terminal for jump starting
    • Install 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) (840i coupe/convertible/Gran Coupe sedan)
    • Remove the positive battery cable from the starter to remote positive terminal
    • Install the positive battery cable from the starter motor 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) (840i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the positive battery cable from the starter to remote positive terminal
    • Install 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) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the positive battery cable from the remote positive terminal to the alternator
    • Install the positive battery cable from the remote positive terminal to the alternator
  • 12 42 652 Removing and installing/replacing the positive battery cable remote positive terminal starter (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the positive battery cable from the remote positive terminal to the starter motor
    • Installing the positive battery cable from the remote positive terminal to the starter
• 12 51 Engine Wiring Harness
  • 12 51 210 Replacing the wiring harness section for injectors and ignition coils (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the wiring harness section for the ignition and injectors
    • Install the wiring harness section for the ignition and injectors
  • 12 51 235 Remove and install/replace Module 1, sensor system engine wiring (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • 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 (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing 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 (M850i xDrive Coupe, M850i Gran Coupe xDrive Sedan)
    • Removing the wiring harness of the engine transmission module for equipment specification without a gasoline particulate filter
    • Version with a gasoline particulate filter: Removing the engine wiring harness from the transmission module
    • Equipment specification without gasoline particulate filter: Install the wiring harness for the engine transmission module
    • Version with a gasoline particulate filter: Installing the engine wiring harness of the transmission module
  • 12 51 250 Remove and install/replace blow-off valve wiring harness, cylinders 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the wiring harness section of the blow-off valve for cylinders 1-4
    • Installing the wiring harness section of the blow-off valve for cylinders 1-4
  • 12 51 251 Remove and install/replace blow-off valve wiring harness, cylinders 5-8 (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the wiring harness section of the blow-off valve for cylinders 5-8
    • Installing the wiring harness section of the blow-off valve for cylinders 5-8
  • 12 51 300 Remove and install/replace engine wiring harness section, ignition module cylinder 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing wiring harness section for the ignition system of cylinder bank 1
    • Installing wiring harness section for ignition system of bank 1
  • 12 51 301 Remove and install/replace engine wiring harness section, ignition module cylinder 5-8 (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove wiring harness section for the ignition system of cylinder bank 2
    • Installing wiring harness section for ignition system of bank 2
  • 12 51 302 Remove and install/replace wiring harness section, sensor system module cylinder 1-4 (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the wiring harness for the sensor system of cylinder bank 1
    • Installing wiring harness for sensor system of cylinder bank 1
  • 12 51 303 Remove and install/replace wiring harness section, sensor system module cylinder 5-8 (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the vehicle wiring harness for the sensor system of cylinder bank 2
    • Installing wiring harness for sensor system of cylinder bank 2
  • 12 51 321 Removing and installing/replacing wiring harness section, adapter, oil-level sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing adapter cable for oil-level sensor
    • Install adapter cable of the oil-level sensor
  • 12 51 322 Removing and installing/replacing the engine control module / power distribution module wiring harness section (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the engine wiring harness section/DME
    • Installing engine wiring harness section/DME
  • 12 51 323 Remove and install/replace wiring harness section for oil temperature sensor adapter (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove wiring harness section adapter for oil temperature sensor
    • Install wiring harness section adapter for oil temperature sensor
  • 12 51 245 Remove and install/replace transmission module engine wiring (M850i xDrive convertible)
    • Removing the wiring harness of the engine transmission module for equipment specification without a gasoline particulate filter
    • Version with a gasoline particulate filter: Removing the engine wiring harness from the transmission module
    • Equipment specification without gasoline particulate filter: Install the wiring harness for the engine transmission module
    • Version with a gasoline particulate filter: Installing the engine wiring harness of the transmission module
  • 12 52 032 Removing and install right control unit bracket (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the control unit bracket for cylinders 1 to 4
    • Installing control unit holder for cylinders 1 to 4
  • 12 52 033 Removing and installing/replacing the left control unit bracket (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the control unit bracket for cylinders 5 to 8
    • Installing the control unit bracket for cylinders 5 to 8
• 12 61 Oil Pressure Switch, Oil Level Sensor
  • 12 61 280 Removing and installing/replacing oil pressure switch (840i coupe/convertible/Gran Coupe sedan)
    • Removing the oil pressure switch
    • Installing the oil pressure switch
  • 12 61 280 Removing and installing/replacing oil pressure switch (840i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the oil pressure switch
    • Installing the oil pressure switch
  • 12 61 280 Removing and installing/replacing oil pressure switch (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove oil pressure sensor
    • Install oil pressure sensor
  • 12 61 285 Replacing engine oil level sensor (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the oil-level sensor
    • Installing the oil-level sensor
• 12 63 Power Distribution Box
  • 12 63 586 Replacing power distribution box (after vehicle diagnosis) (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove the integrated power supply module (PDM)
    • Install the integrated power supply module (PDM)
  • 12 63 586 Replacing power distribution box (after vehicle diagnosis) (M850i xDrive coupe/convertible/Gran Coupe sedan)
    • Removing the integrated power supply module
    • Installing the integrated power supply module
• 12 90 ECM Housing
  • 12 90 150 Remove and install/replace control unit box (840i and 840i xDrive coupe/convertible/Gran Coupe sedan)
    • Remove control unit bracket
    • Install control unit bracket