Fuel Pump Control

Using the signal from the crankshaft position sensor, the ECM controls operation of the fuel pump by turning its relay ON or OFF. To improve safety, the fuel pump is stopped if the engine stalls with the ignition switch ON.

FUEL PUMP SWITCH SPECIFICATION

Ignition switch ON	Fuel pump relay	Fuel pump
A certain period of time after ignition switch is turned ON	ON	Operates
While cranking the engine	ON	Operates
While engine is operating	ON	Operates
When engine stops	OFF	Does not operate

Also, by controlling the voltage supplied to the fuel pump with the fuel pump controller, the fuel temperature is lowered and fuel consumption is reduced.