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COMPONENT PARTS EC-23 < SYSTEM DESCRIPTION > [HR16DE] C D E F G H I J K L M A EC N P O EVAP Control System Pressure Sensor INFOID:0000000009266967 The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pres- sure increases. Exhaust Valve Timing Control Solenoid Valve INFOID:0000000009266968 Exhaust valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM. The exhaust valve timing control solenoid valve changes the oil amount and direction of flow through exhaust valve timing control unit or stops oil flow. The longer pulse width retards valve angle. The shorter pulse width advances valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the exhaust valve angle at the control position. Fuel Injector INFOID:0000000009266969 The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injec- tor is energized. The energized coil pulls the ball valve back and allows fuel to flow through the fuel injector into the intake manifold. The amount of fuel injected depends upon the injection pulse dura- tion. Pulse duration is the length of time the fuel injector remains open. The ECM controls the injection pulse duration based on engine fuel needs. Fuel Pump INFOID:0000000009266970 *: ECM determines the start signal status by the signals of engine speed and battery voltage. The ECM activates the fuel pump for a few seconds after the ignition switch is turned ON to improve engine start ability. If the ECM receives a engine speed signal from the crankshaft position sensor (POS) and cam- shaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed 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. PBIB3370E JSBIA0652ZZ JSBIA0742ZZ Sensor Input signal to ECM ECM function Actuator Crankshaft position sensor (POS) Engine speed* Fuel pump control Fuel pump relay Battery Battery voltage* |