Port Fuel Injection

Port fuel injected vehicle can operate in one of two modes, simultaneous or sequential injection. In simultaneous injection mode, fuel is injected into all cylinders at the same time. This is done once for each crankshaft revolution, providing one half of the required fuel for each combustion cycle. In sequential injection mode, the injectors are triggered in spark plug firing order.

If airflow meter should malfunction, ECU will enter a fail-safe mode. In fail-safe mode, injection will be determined from internal default tables based upon throttle position, CHECK ENGINE light will illuminate and engine speed will be limited to less than 2400 RPM. When the engine reaches this maximum RPM, it will not go faster, indicating the fail-safe system is in effect. This informs the driver that attention to the vehicle is needed.