Prizm L4-1800cc 1.8L DOHC (1993)
Fuel Pressure Check - Part 2 Of 2
Fuel Pressure Check
Circuit Description:
When the ignition switch is turned to the "START" position, the circuit opening relay will be energized to allow the fuel pump to operate to
pressurize the system. The fuel pump will continue to operate if the powertrain control module (PCM) receives an ignition signal when the engine
is started. The fuel pump operates as long as the circuit opening relay is energized by the PCM. When the circuit opening relay is de-energized, the
fuel pump will stop operating. The fuel pump delivers fuel to the fuel rail where the pressure is maintained by the fuel pressure regulator at 284
kPa (41 psi) higher than the pressure inside the intake manifold. Excess fuel is returned to the fuel tank through a return pipe and hoses.
