Fuel Control: Notes

ECM calculates base injection pulse width by processing signals from various engine sensors. Information from engine speed (RPM) sensor at flywheel is used to trigger timing of fuel injection. During normal driving conditions, injection duration is regulated in reference to MAF sensor, engine speed, oxygen content of exhaust gases and coolant temperature. Under full throttle conditions, a richer fuel mixture is provided for increased power and to reduce combustion heat in engine and catalytic converter.