1.9L Engine Control System: Operation

The primary function of the Closed Loop Emission Control system is to maintain an ideal air/fuel ratio of 14.7:1 under all operating conditions. When an ideal ratio is maintained, the catalytic converter can effectively control nitrogen oxides (NOx), hydrocarbons (HC) and carbon monoxide (CO).

The Closed Loop Emission Control system consists of the following sub-systems: Fuel Control, Data Sensors, Electronic Control Module (ECM), Diagnostic System and Catalytic Converter.