Fuel Pump: Description and Operation

Fuel pump

Fuel pump




The central electronic module (CEM) (4/56) receives a request to start the fuel pump from the engine control module (ECM) (4/46) via CAN network. The central electronic module (CEM) then activates an internal relay that supplies power to the fuel pump unit (4/83), which in turn powers the fuel pump (6/33).
If the CAN network does not function the relay for the power supply to the fuel pump control module will not be activated.
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) to the central electronic module (CEM) via the CAN network. The central electronic module (CEM) deactivates the relay for the fuel pump unit.