It runs the whole engine, when something is wrong, it tells u what it is It's wired to ... It's called ECU (Electronic Control Unit) or ECM (Electronic Control Module)
The ECU - Electronic Control Unit or ECM - Electronic Control Module, also known as the automobile's ‘Fuel Computer’ or ‘Brain Box,’ is an electronic computer that regulates the amount of fuel that your vehicle’s injectors release into the intake manifold.
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