Injection Timing: Description and Operation

The period of time the fuel injectors are energized is controlled by the powertrain control module.

The pulse width is determined by inputs from the:
^ Heated Oxygen Sensor (HO2S)
^ mass air flow sensor
^ Engine Coolant Temperature (ECT) sensor
^ camshaft synchronizer
^ Intake Air Temperature (IAT) sensor
^ Between idle and 6,500 rpm, the fuel is injected to each cylinder independently by giving one injection per two crankshaft rotations (one injection per cycle) to all cylinders.
^ Fuel injection for each cylinder takes place during its exhaust stroke.
^ Above 6,500 rpm, fuel is cut to prevent engine overspeeding and possible engine damage.