Check/replace fuel pump fuse and relay. I do not know what you mean by "leveler" sign?
Fuel, pressurized by electric fuel pump, flows through fuel filter, injector fuel rail and fuel pressure regulator. Pump is located in fuel tank. PCM controls fuel pump relay ground circuit during run and start modes.
Fuel Pump Relay
The PCM activates fuel pump relay based on inputs from the ignition switch and the camshaft position sensor signal. During cranking, ignition switch cranking circuit energizes fuel pump relay. After engine starts and key is released to RUN position (engine speed more than 50 RPM), PCM provides fuel pump relay ground.
Fuel Pressure Regulator
Pressure regulator is a sealed unit, divided into 2 chambers (fuel and spring chambers) by a diaphragm. The fuel chamber receives fuel through the inlet side of injector fuel rail. The spring chamber is connected to intake manifold vacuum.
At idle, intake manifold vacuum is high. The diaphragm is pulled back by intake manifold vacuum, and excess fuel is returned to fuel tank. As throttle opens, intake manifold vacuum decreases. The regulator spring overcomes manifold vacuum, increasing fuel pressure.
Pressure Regulator Control (PRC) Solenoid
PRC system includes a solenoid connected to vacuum line of fuel pressure regulator. During hot engine restarts, PCM energizes PRC solenoid. This prevents intake manifold vacuum from going to fuel pressure regulator and increases fuel pressure about 8 psi (.6 kg/cm2 ).
The PCM controls fuel injector ON time (pulse width) to meter fuel quantity into intake ports. The PCM receives inputs from engine sensors to compute fuel flow necessary to maintain correct air/fuel operation throughout engine operating range.
Each cylinder has a solenoid-operated injector that sprays fuel toward each intake valve. Each injector receives battery voltage from main relay. The PCM-controlled ground circuit is used to complete the circuit and energize the injector. Fuel injectors "fire" sequentially (in engine firing order) once per complete cycle.
Injectors consist of solenoid-actuated pintle and needle valve assembly. Amount of fuel delivered to engine is regulated by length of time solenoid is energized (pulse width). Atomized spray pattern is obtained by shape of injector pintle.
Thursday, March 18th, 2010 AT 5:42 AM