BMW 3 Owners & Service Manuals

BMW 3: Introduction

In the G20 PHEV, the B46B20O1 is an element of the BMW hybrid drive. The 4-cylinder engine, which generates power of 135 kW (180 hp) and a maximum torque of 300 Nm, guarantees more sustainability and efficiency.

Modified B46 engine

For use in the G20 PHEV, the B46 engine and its periphery have been modified.

Details of the individual modifications are provided in the following:

Modified B46 engine

Belt drive

For deployment in the G20 PHEV, the belt drive has been modified compared to the B46TU engine in a conventional vehicle. The elimination of the alternator and mechanical air conditioning compressor enabled a reduction in the width of the belt from 6 ribs to 3 ribs.

The vibration damper has also been adapted to the modified belt drive. A viscous vibration damper with rigid belt pulley is deployed.

Modified B46 engine
G20 PHEV belt drive B46B20O1

  1. Viscous vibration damper with rigid belt pulley
  2. Coolant pump belt pulley
  3. Tensioning pulley
  4. Elastic belt

The belt is tensioned via an eccentric tensioning pulley mounted on the component carrier. The dust- protected tensioning device is located under a cover on the tensioning pulley.

A belt that is not tensioned in line with accepted technical principles can lead to loss of function of the driven component or to damage. The notes and instructions in the current repair instructions therefore apply.

Vacuum system

Various components of the G20 PHEV are shown with a vacuum supply. The B46 engine generates the required vacuum using a mechanical vacuum pump. As the vacuum supply must also be guaranteed in phases in which the B46 engine is not active, the vacuum system has been enhanced with an electrical vacuum pump. As soon as the value in the vacuum system drops below a certain threshold, the electrical vacuum pump is activated. The vacuum is measured by a pressure sensor in the brake servo, which is already known from vehicles with an automatic engine start-stop function.

The following graphic provides an overview of the respective components:

Modified B46 engine
G20 PHEV vacuum system

  1. Electrical vacuum pump
  2. Vacuum line to electrical vacuum pump
  3. Mechanical vacuum pump
  4. Pressure sensor
  5. Brake servo

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     Fuel supply

    For the operation of the combustion engine, the G20 PHEV is equipped with a pressurized fuel tank. As a result during purely electric driving it is guaranteed that the gasoline fumes remain in

     Components and their installation location

    G20 PHEV components of the fuel supply in European version Carbon canister Pressurized fuel tank (in cast aluminum housing) Fuel filler flap with cover Fuel tank isolation valve Cable for

     System wiring diagram

    G20 PHEV, system wiring diagram for fuel supply Integrated supply module Digital Motor Electronics (DME) Shutoff valve purge air line (only for US version) Body Domain Controller (BDC) Fue

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     Storage compartments

    General information The vehicle interior contains multiple storage compartments for stowing objects. Safety information Warning Loose objects or devices with a cable connection to the vehicle, for instance mobile phones, can be thrown into the car's interior while driving, for instance in the event

     Programmable memory buttons

    General information The iDrive functions can be stored on the programmable memory buttons and called up directly, for instance radio stations, navigation destinations, phone numbers and menu entries or pages in the Integrated Owner's Manual. Settings are stored for the driver profile currently used.

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