Teknikimobil.com – Good afternoon car technician friends wherever you are. How are you today? Hopefully you remain in good health and can carry out your activities well today. This time I will discuss the ISC Avanza, an actuator owned by the best-selling car in Indonesia.
ISC Avanza An Actuator
Actuators are different from sensors even though they are both connected to the Avanza car’s ECU. In short, the sensor is a news seeker, the actuator is an executor based on the news obtained by the sensor which is processed in the ECU . So, one of the actuators on the Avanza car is ISC or idle speed control.
ISC or ISC actuator works when the engine is in idle condition. Almost the average car has an idle RPM of between 800-900 revolutions per minute. When idling, for example the AC is turned on at idle, the engine will rotate at around 1000-1200 rpm. Interestingly, the engine rotation must be able to continue while idling without us pressing the gas pedal or opening the throttle valve on the throttle body.
So where does the air mixed with the burning fuel in the cylinder come from?
Interesting question. Every combustion in an engine requires air, in this case oxygen in particular. If there is no oxygen then combustion will not occur in the combustion chamber. Therefore, the Avanza car has an actuator called idle speed control installed.
The actuator will open based on the ECU command which of course adjusts the air gap opening conditions based on information from the sensor. If the engine requires more power, such as when the AC is on (idle condition), the actuator will open a larger air gap. On the other hand, ISC will close (narrower) the air gap when there is no engine load at all.
Well, the engine usually experiences very low idle and eventually stalls. Or the engine will have a very high idle rpm. Both of these things could be because the ISC is dirty or damaged. Damage and/or dirt on the ISC will cause the ISC to be stuck opening a wide air gap resulting in high RPM. Or the ISC is stuck closing the air gap so that the idle rpm is too low and eventually dies.