The location of individual elements of the injection and ignition systems in the engine compartment of a car with an SR20Di engine
1 - air flow meter; 2 - central injection valve; 3 - fuel pressure regulator; 4 - fast idle cam; 5 - thermoelement; 6 - cam lever; 7 - throttle damper; 8 - additional air valve; 9 - throttle position sensor; 10 - idle speed control switching valve; 11 - control valve; 12 - exhaust gas return valve; 13 - exhaust gas pressure control valve; 14 - activated carbon adsorber control valve; 15 - ignition coil; 16 - fuel filter; 17 - knock sensor; 18 - transistor; 19 - crankshaft angle sensor
1. Crankshaft angle sensor (19) performs the same task as described in paragraph. " Open the lid... " . The same applies to air flow meter (14) (See Section Multi-position injection system (sR20DE engine)).
2. Engine temperature sensor not visible in the illustration, it is located behind the oil filter in the place shown in the illustration below. The sensor monitors the coolant temperature and provides information as a signal to the electronic control device. The sensor is equipped with a thermistor, which reacts to temperature changes. The electrical resistance of the thermistor decreases as the temperature increases.
Coolant temperature sensor position
1 - temperature sensor; 2 - intake manifold; 3 - oil filter
3. Throttle Position Sensor (9) has the same task as described in Section Multi-position injection system (sR20DE engine).
4. Injection valve (injector) (2) (See Section Multi-position injection system (sR20DE engine)).
5. When the electronic control unit sends a signal to the injector, the coil in the valve pulls the ball valve back and fuel is injected through the nozzle to the throttle valve. The injection duration is also determined by the control unit.
6. Pressure regulator (3) maintains a constant pressure of 2.5-2.55 bar. Since the amount of fuel injected depends on the duration of injection, the pressure must be maintained at the specified level.
7. Transistor (18) serves the same purposes (see section Multi-position injection system (sR20DE engine)).
8. Fast Idle Cam (4) is located on the throttle body and provides sufficient RPM while the engine is cold. The cam is controlled by a thermoelement (5) filled with wax, which can expand and contract under the influence of temperature, thereby moving the lever (6).
9. In position 8 (8) is located additional air valve, which is switched on and off by the control device to supply the required air.
10. The preheating device for the working mixture is installed between the lower throttle body and the intake manifold and is located in the place indicated in the illustration below. The device is activated by the control unit and helps to atomize the fuel when the engine is cold.
The position of some elements on the other side of the engine (which are not visible on in the drawing). The arrow points forward
1 - exhaust gas return and activated carbon adsorber regulating valve; 2 - exhaust gas pressure regulating valve; 3 - exhaust gas return control valve; 4 - transistor; 5 - coolant temperature sensor
11. The speed sensor is installed in the speedometer and converts the instrument readings into pulses to report information to the control unit. In order to maintain a constant speed when the engine is subjected to additional load due to the inclusion of servo control, a high-pressure line of the steering system is installed oil pressure sensor (See Section Multi-position injection system (sR20DE engine)).
12. Located on the cylinder block engine knock sensor. When the engine begins to vibrate due to detonation, the vibration is converted by the sensor into a voltage signal, which is fed to the control unit.
13. Fuel filter (16) is housed in a metal housing to withstand high fuel pressure. One hose is connected to the filter at the top and bottom. The filter sits in a spring clip. Before replacing the filter (recommended every 40,000 km or every 2 years), the pressure in the system should be reduced to avoid fuel splashing. Install only the appropriate Specifications filter.
14. Activated carbon adsorber serves the same purpose as on a carburetor engine (Section Multi-position injection system (sR20DE engine)).
15. Fuel pump is located in the fuel tank (Section Multi-position injection system (sR20DE engine)).
All instructions concerning the ignition system are in Chapter Engine electrical system. On vehicles with a catalytic converter, a lambda probe is installed in the exhaust system. It measures the oxygen in the exhaust gases and changes the fuel-air ratio accordingly.
The injection system works together with the exhaust gas return system. The exhaust gas return control valve regulates the amount of exhaust gases that return to the intake manifold. The valve, under the influence of the vacuum under the throttle valve, closes or opens the supply of exhaust gases to the intake manifold.