Functional description

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The fuel pump control module is a type of control electronics and not a control unit. The fuel pump control module is therefore not a bus user.

The Digital Engine Electronics (DME) communicate with the fuel pump control module via a pulse-width modulated signal. The electric fuel pump is a brushless three-phase motor. The fuel pump control module activates the three-phase motor.

The pulse-width modulated signal is also used for carrying out diagnosis on the fuel pump control module. Faults are stored in the DME.

The electric fuel pump is an in-tank unit; its function is to supply fuel to the engine. The electric fuel pump is a brushless three-phase motor.

The electric fuel pump is activated as needed. The DME employs driver demand and instantaneous engine operating conditions to calculate the quantity of fuel required at any specific juncture. The required fuel quantity is transmitted to the fuel pump control module as a pulse-width modulated signal.

Fig 1: Identifying Fuel Pump Control Module

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Fuel pump control module
2	10-pin plug connection