The ignition timing sensor is inductive and is installed on the left side of the engine crankcase. The ignition advance sensor signal is required when starting the engine in order to determine the TDC in the third cylinder of the engine at the moment of ignition together with the Hall sensor signal. If there is no signal, the engine will not start.
The Hall sensor is located on the rear end of the left cylinder head. The principle of operation of the sensor is described in the description of the ignition distribution system. The sensor signal is required when starting the engine in order to determine the TDC in the third cylinder of the engine at the moment of ignition together with the signal from the ignition timing sensor. If there is no signal, the engine will not start.
The crankshaft speed sensor is screwed to the flywheel ring gear. Its signal allows the control unit to calculate the ignition timing and the start of injection. If there is no signal, the engine will not start.
The idle switch and throttle potentiometer are located in a common housing at the throttle assembly. They determine the position of the throttle valve for the control unit. Thanks to this, in particular, the slide switch is controlled, since as long as the contact of the idle switch is not switched on and at the same time the engine speed exceeds a certain value, the control unit blocks the fuel supply to the engine.
Both knock sensors are located on the inside of the cylinder blocks at the top of the middle cylinders just below the cylinder heads. Selective knock control maintains ignition timing at the knock limit and automatically adapts to the quality of the fuel used. Knock control allows the engine to have a high compression ratio. As a result, the energy of the fuel is better used, which at the same time leads to a reduction in fuel consumption. The control system includes knock sensors and corresponding analysis electronics. Due to the high compression ratio of the engine, knocking combustion can occur, which, after a certain duration, causes damage to the engine. To avoid this, knock sensors are required that detect combustion disturbances and take care to change the ignition timing to a later one. If the knock sensor fails, the control unit automatically advances the advance to a later one so that the engine does not suffer damage. First of all, this is due to a decrease in power, which also occurs when, instead of Super unleaded gasoline (AI 95 or AI 98) ordinary unleaded gasoline is poured into the fuel tank (AI 91).
Both oxygen sensors are screwed into their respective exhaust pipes. They measure the oxygen content in the exhaust gases in vehicles with a regulated catalyst and send a corresponding voltage signal to the control unit. In accordance with this, the control unit changes the qualitative composition of the intake air-fuel mixture so that the exhaust gases burn out optimally in the catalyst.
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