BMW 3 Owners & Service Manuals

BMW 3: Cooling

To guarantee the thermal operating safety of the electrical machine in every situation, it is cooled with coolant in the G20 PHEV. For this, the electrical machine is integrated in the coolant circuit of the transmission.

To cool the stator coils, the transmission oil is directed through a coolant duct between the stator support and the housing of the automatic transmission. The coolant duct is sealed at the front and back with two sealing rings.

The rotor is also cooled by transmission oil, which absorbs heat energy in the form of oil mist and dissipates it to the ambient air at the transmission oil cooler.

G20 PHEV, cooling of the electrical machine

  1. Transmission oil cooler
  2. Electric motor
  3. Connection of transmission oil lines (for cooling the electrical machine)
  4. Automatic transmission
  5. Connection of transmission oil lines (for cooling the automatic transmission)
  6. Transmission oil thermostat
  7. Automatic transmission housing
  8. Transmission oil duct electrical machine
  9. Stator support

Service information

The lid in front of the electrical machine cannot be opened in Service. All work at the electrical machine, the additional torsional vibration damper, the separation clutch, as well as at the rotor position sensor itself, is prohibited. In the event of a fault with one of these components, the entire automatic transmission must be replaced.

Before removing the automatic transmission, the electrical safety rules must be applied.

After replacement of the automatic transmission or the Electrical Machine Electronics, the rotor position sensor must be adjusted with help of the diagnosis system.

The dual-mass flywheel can be replaced separately. Always proceed in accordance with the current repair instructions.


     Electrical Machine Electronics


    The Electrical Machine Electronics (EME) is primarily used as control electronics for the electrical machine. It is also responsible for converting the direct current voltage from the high-voltage b


    The connections at the Electrical Machine Electronics can be divided into four categories: Low-voltage connections High-voltage connections Connection for potential compensation line Connections



    General information The fuses are located at different places in the vehicle. Safety information Warning Incorrect and repaired fuses can overload electrical lines and components. There is a risk of fire. Never attempt to repair a blown fuse. Do not replace a nonworking fuse with a substitute of an

     Rolling or pushing the vehicle

    General information In some situations, the vehicle is to roll without its own power for a short distance, for instance in a vehicle wash, or be pushed. Engaging selector lever position N 1. Switch on drive-ready state while pressing on the brake pedal. 2. If necessary, release the parking brake.

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