Fuel Injection System - 2.5L Turbo: Description
The Chrysler Multi-Point Electronic Fuel Injection system is a computer controlled system with a separate fuel injector for each cylinder. Fuel is supplied to the engine through electronically controlled injectors located in the intake manifold. A Single Module Engine Controller (SMEC) or Single Board Engine Controller (SBEC) supplies power to the injectors and determines the length of time the injectors are left open. The SMEC is used on 2.5L turbo engines.
The SMEC are pre-programmed computers which control ignition timing, emission control devices and idle speed in addition to air/fuel ratio. The amount of fuel to be metered through the injector is based on engine operating condition information as supplied by various engine sensors and switches. These include the Manifold Absolute Pressure (MAP) sensor, Throttle Position Sensor (TPS), oxygen sensor, coolant temperature sensor, vehicle distance/speed sensor and fuel charge temperature sensor.