I would like to know what roles the:: FmU/ ECU/ TCU, cpiggy back chip, and feul pump(I thought there where 2 feul pumps) all play, I am very interested.
Stupid question???
ECU = brains of your car. Controls fuel maps, injector pulses, etc
TCU = the little brain in the 240 that controls things like chimes, clock, and other various things.
Piggy Back Chip = A form of ECU upgrade. Instead of replacing the ECU it sits between it and the ECU’s sensors and modifies the signal to achieve some result.
Fuel Pump = Delivers fuel from the gas tank to the engine. Not that tricky. There is only 1 on our cars.
www.howstuffworks.com has great stuff on all car subjects.