B Series Truck 2WD L4-2184cc 2.2L 2200 2-bbl (1990)
Mixture Control Solenoid: Description and Operation
Feedback Carburetor System (FBC)
The Air/Fuel Solenoid Valve controls the amount of fuel added to the primary main circuit through the solenoid-controlled fuel jet. It also controls the
air added to the primary slow circuit through the solenoid-controlled air-bleed.
The ECU controls the opening duration (duty cycle) of the air/fuel solenoid valve to maintain the air/fuel mixture at the stoichiometric air-fuel ratio
(14.7:1) and be suitable for current driving conditions. A number of input signals are utilized by the ECU in its calculation of air/fuel solenoid valve
duty cycle.
