Feedback Control Solenoid: Description and Operation

Feedback Solenoid Valve (FBSV) Control System:

FBSV And SCSV Locations:

Feedback Solenoid Valve (FBSV) is installed in the carburetor float chamber cover. The ECU controls the air-fuel ratio of the main fuel metering circuit. This is done by controlling the duty cycle of the FBSV based on the FBC sensor inputs. The longer the duty cycle "ON" time ratio, the leaner the air-fuel ratio.