Fuel Injection Control

The ECM controls fuel injector timing and pulse width based on sensor inputs. ECM uses the Crankshaft Position (CKP) sensor to determine when to pulse each injector. ECM uses engine coolant temperature, intake air temperature, airflow and throttle position information to calculate injector pulse width. Each fuel injector is pulsed once for each cylinder for every 2 crankshaft rotations. During cranking, all injectors are pulsed simultaneously until engine starts. During engine operation, each injector is sequentially pulsed.