Fuel pump

Fig 1: Fuel Pump Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) (4/56) receives a request from the engine control module (ECM) (4/46) via the control area network (CAN) to start the fuel pump (FP) (6/33). The central electronic module (CEM) then activates the relay (2/23) which supplies the fuel pump with power.

In the event of a collision in which the airbags are deployed, a signal is transmitted from the supplemental restraint system (SRS) module (4/9) via the control area network (CAN) to the central electronic module (CEM) which deactivates the relay for the fuel pump.

If the control area network (CAN) is not functioning, a pulsed signal to control the fuel pump (FP) is transmitted from the engine control module (ECM) to the central electronic module (CEM) via a directly connected cable.