Sidekick JSS 4D Hard Top 2WD L4-1.8L (1997)
Oxygen Sensor: Description and Operation
HEATED OXYGEN SENSOR HEATER CONTROL SYSTEM
This system controls operation (ON/OFF) of the heater which assists activation of the oxygen sensor. ECM turns the oxygen sensor heater ON (to
allow the electric current to flow to the oxygen sensor heater) when the warmed up engine is running without high-load and high-speed condition.
