2.5L TBI System: Description
The computerized engine control system, used on 2.5L models with throttle body fuel injection, is built around an electronic control unit (ECU). The ECU is a microprocessor-based computer.
The major function of the system is to reduce emissions. It accomplishes this through a series of 13 sensors or switches that constantly monitor several engine conditions. See Fig 1 .
The computer processes input information from the sensors to get an accurate picture of engine operation. It then provides output control signals to regulate air/fuel ratio, ignition, idle speed and emission control devices.