Fuel Injection Timing

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