Fuel Injection Timing

- Each fuel injector is energized once every other crankshaft revolution in sequence with ignition firing order.
- The period of time that the fuel injectors are energized (injector "on time" or pulse width) is controlled by the Powertrain Control Module (PCM).
- Air entering the engine is monitored by flow, pressure, and temperature sensors.
- The signals of the electronic engine control sensors are processed by the powertrain control module.
- The powertrain control module determines the needed injector pulse width and sends a command to the fuel injectors to meter the exact quantity of fuel.