Modern cars engines are electrically and electronically controlled, to a large extent. As they get older, some of the electrical components will pack up gradually. Since they are electronic, its easier to electronically find out which of them that needs to be replaced by diagnosing with electronic tool like scanner. Otherwise you can go the route of trial and error, complicating issues.
ECU means Electronic Control Unit, what most Nigerians call "Brainbox".
Its an electronic module that controls anything that has electrical connection to it.
In modern lions, each has more than 5 ECUs. Engine has its ECU. Radio has its ECU. Automatic gearbox, variable steering, variable suspension, Airbag, ABS, etc. All these have their separate ECUs.
So when something is wrong with the way engine is behaving, you scan the engine ECU, because that's where you will find the cause. Same way when automatic gearbox is giving warning, the fault or cause will be stored in its ECU, not engine ECU or power steering ECU. Same way you scan ABS ECU if ABS is given malfunctioning sign on the instrument panel or display.
Some lions diagnose themselves and display the faults or causes on the Display on Dashboards, with option of scanning as well, for more technical test, diagnosis, etc.
- Ikenna, Lion King.
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