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A car and a car's computer that is stated as ECU, their functioning are not inter-relative. Actually, it is just a pre-programmed control given to the car for some specific functions. Some examples are:- Power Steering, Power brake, Electronic Fuel Injection Control, etc. So, the non-functioning of the ECU depends only upon the ECU itself. The problems may be:-

1. Whether the ECU's circuit-board is alright or not.

2. Whether it is getting the required input from the car or not.

3. Whether it is doing the processes it is programmed to do or not.

4. Whether it is giving the required output to the car or not.

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