The air is sucked in by the engine through the air filter and the air intake pipe and is measured by the air mass meter. A damper is located in the air mass meter housing, which is deflected by the air passing through it at a certain angle. The angular position of the damper serves as a measure of the amount of air passing through. Information about the amount of passing air is transmitted to the control unit from the potentiometer.
The control unit regulates the injection time and thus the amount of injected fuel in accordance with the measured air mass. With a longer opening of the nozzle, more fuel has time to be injected. Additional sensing elements and sensors ensure the supply of the right amount of fuel even in extreme driving situations.
The throttle switch is located directly on the throttle shaft. It supplies the control unit with throttle position signals in idle and full load positions. As a result of this, control is primarily carried out in forced running mode: as long as the throttle switch contact is closed and at the same time the speed exceeds 1200 rpm, the control unit blocks the fuel supply to the engine.
The fuel pump relay is located in the relay box at the right rear of the engine compartment. It supplies power to the fuel pump. When you stop receiving pulses from the speed sensor with the ignition on (with a stalled engine) the control circuit interrupts the power supply.
The speed and reference mark sensor is located on the bracket on the right side of the engine block. It supplies the control unit with information about the number of revolutions.
Lambda probe (oxygen sensor) measures the oxygen content in the exhaust gas stream on vehicles equipped with a variable catalytic converter and transmits the corresponding electrical signal to the control unit. Based on this information, the control unit changes the composition of the intake air-fuel mixture in such a way as to ensure optimal afterburning of the exhaust gases in the catalyst.
The idle air control regulates the amount of air in idle speed in the throttle area. As a result, a stable speed is achieved, regardless of whether additional consumers such as power steering or air conditioning compressor are connected. The idle speed controller is controlled by the electronic control unit of the fuel injection system.
The control unit is located in the engine compartment behind the right shock absorber column.