2010 Toyota Tacoma brainbox

My name is faith am a newable person in these site, I will be very greatful if I can no more on these automobile site. I want too know full details on these following listed below: ignition, fuel pump and brainbox. How does this componet work in a Toyota camry. Am on my way too my uncle's house, the vehicle just off by itself I start it again the engine is rolling but he did not start. I call my mechanic to check the problem, he tolp me that the problem is from these. Three mayjor componet, ignition, fuelpump and brainbox. How does the brainbox control ignition and fuel pump.