Fuel Pump Control Module
The fuel pump control module is called the PEM (Pump Electronic Module). The function of the PEM is to supply the fuel pump with voltage and to control the power output of the fuel pump. When the power output of the pump is changed the fuel pressure/fuel flow is also changed.
The fuel pump control module is supplied with battery voltage by the fuel pump (FP) relay and is grounded in the car body. The fuel pump (FP) relay is controlled by the central electronic module (CEM) when requested by the engine control module (ECM).
The engine cannot be started if the power supply to the fuel pump control module is faulty because the fuel pump will not then be powered.
Fuel pump control module is controlled by Engine control module (ECM) via serial communication. Then the fuel pump control module controls the fuel pump by adding a pulse-width modulated (PWM) voltage on the fuel pump's ground cable.
This means that the voltage across the pump changes, and then also the fuel pump's output.
See also, see FUEL PRESSURE REGULATION
There are no diagnostics for the fuel pump control module. The engine control module (ECM) has diagnostics for fuel pressure regulation and the associated components. See also: FUEL PRESSURE CONTROL, DIAGNOSTICS
The pulse width modulated (PWM) signal from the engine control module (ECM) to the fuel pump control module can be read off using the diagnostic tool.
The fuel pump control module is on the outside on the right-hand side of the fuel tank.