Fuel Pump Control System

INPUT/OUTPUT SIGNAL LINE




SYSTEM DESCRIPTION
Fuel pump and IACV-air regulator ON-OFF control
The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine start-up. Upon receiving a 1° signal from the camshaft position sensor, the ECM detects engine rotation and causes the pump to activate. If the 1° signal is not received when the ignition switch is on, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.




Fuel pump voltage control
The fuel pump is controlled by the fuel pump control module adjusting the voltage supplied to the fuel pump.