The MAZDA 323 electronic injection system injects fuel into the intake pipe up to the intake valves depending on the condition of the engine.
Fuel is sucked from the tank by an electric fuel pump and fed through the fuel filter and distribution line to the injection valves.
Air is drawn in by the engine through the air filter and intake manifold and is measured by an air flow meter. The air flow meter has a damper in the body that is deflected by the air flow. The damper position acts as a parameter for determining the air flow. The corresponding signal is fed to the control device from the damper potentiometer.
The control unit adjusts the injection time according to the amount of air and the engine speed. With a longer opening of the injection valve, more fuel is injected per revolution of the crankshaft. The control unit is located in a housing in the passenger compartment behind the center console.
Additional sensors and elements ensure the correct air/fuel ratio in all situations.
- The air flow meter is located directly on the air filter. It reports the instantaneous amount of air to the control unit.
- The throttle position sensor is located directly on the throttle shaft. It reports the current throttle position to the control unit. The control device, based on data received from the air flow meter and the throttle position sensor, determines the optimal amount of fuel for the corresponding degree of load.
- idle speed controller (solenoid valve) regulates the air supply to the throttle valve environment. As a result, the engine speed is stabilized, especially in the warm-up phase.
- Lambda probe (oxygen sensor) measures the oxygen content in the exhaust gases and sends a corresponding electrical signal to the control unit. Based on this, the control device changes the composition of the working mixture so that the exhaust gases are optimally afterburned in the catalytic converter (catalyst).
- The temperature sensor measures the coolant temperature at the cylinder head. It transmits data to the control device. The control device coordinates the quality of the working mixture with the temperature, due to which the engine runs stably in all temperature conditions.
- The gas tank vent valve is controlled depending on the condition of the engine. The released fuel vapors in the tank are accumulated by an activated carbon adsorber and removed through the afterburner valve. Thanks to the activated charcoal adsorber, most of the gasoline vapors are put to good use and do not end up in the environment.
Attention! When working on the injection and fuel supply system, certain rules of cleanliness must be observed, see Chapter Power system, carburetor, fuel injection system, Chapter Rules for cleanliness when working with the power system.