Isuzu Cars and Trucks 1981-1991

Closed Loop Emission Control System


The closed loop emission control system precisely controls the air/fuel ratio near the optimum mixture and allows the use of the 3-way catalyst to reduce the oxides of nitrogen and oxidize hydrocarbons and carbon monoxide. The essential components of the closed loop system are the coolant temperature sensor, oxygen sensor, electronic control module (ECM), feedback carburetor, 3-way catalytic converter, idle and WOT switches (1988 Pick-Up), idle switch and MAP sensor (1989 and 1990 Amigo and Pick-Up), duty solenoid, fuel cut solenoid (Amigo and Pick-Up).