Engine and Emission Control Parts Description
EF & EC-373prose procedureFuel injector shown for both SR20DE and SR20DET. Exhaust gas sensor applies to models with catalyzer only.
Fuel Injector
The fuel injector is a small, elaborate solenoid valve. As the E.C.U. sends injection signals to the injector, the coil in the injector pulls the needle valve back and fuel is released into the intake manifold through the nozzle. The injected fuel is controlled by the E.C.U. in terms of injection pulse duration.
Pressure Regulator
The pressure regulator maintains the fuel pressure at 299.1 kPa (2.991 bar, 3.05 kg/cm2, 43.4 psi). Since the injected fuel amount depends on injection pulse duration, it is necessary to maintain the pressure at the above value.
| Specification | Value |
|---|---|
| Fuel pressure (regulated)2.991 bar, 3.05 kg/cm2, 43.4 psi | 299.1kPa |
Fuel pressure (regulated)2.991 bar, 3.05 kg/cm2, 43.4 psi
299.1kPa
Exhaust Gas Sensor (Models with catalyzer only)
The exhaust gas sensor, located in the exhaust tube, monitors the oxygen level in the exhaust gas. This sensor is made of ceramic titania, the electric resistance of which drastically changes at the ideal air-fuel ratio.
The E.C.U. supplies the sensor with approximately 1V and then measures the output voltage depending on its resistance. In order to activate the sensor element, it is equipped with a heater.