LCS is short for Lambda Control System
it is a feedback system that constantly adjusts the gas flow according to the requirement of the engine , hence giving u more and appropriate power at right moments , preventing ur routine checkups of gas settings and giving u almost same pickup even if u get CNG from different stations.
it takes inputs from
Throttle Positioning Sensor
MAP sensor or Engine load sensor
O2 sensor (Drilled in Exhaust)
processes them thru the independent ECU that comes with the package and adjusts the stepper motor that is instlled on gas flow line