General System Description

These vehicles are equipped with an Electronic Control Unit (ECU) which uses inputs from various sensors to tell it under what conditions the engine is running. It then processes these signals and by its output to the engine control devices, the ECU gives maximum engine performance while limiting the production of harmful emissions.

The Air Intake System supplies air for all engine needs. It consists of the air cleaner, air intake pipe, throttle body, EACV, fast idle mechanism, and intake manifold. A resonator in the air intake pipe provides additional silencing as air is drawn into the system.

The Emission Control System along with the ECU and it`s engine management systems, regulate and reduce the amount of pollution emitted. The system includes a three-way catalytic converter, exhaust-gas recirculation (EGR) system, crankcase ventilation system, and evaporative control system.

The idle control system controls the idle speed of the engine. The idle speed of the engine is controlled by the Electronic Air Control Valve (EACV) and the fast idle valve. The valve changes the amount of air bypassing into the intake manifold in response to electric current sent from the ECU. When the EACV is activated, the valve opens to maintain the proper idle speed.