Heated Oxygen Sensor-1 and -2 Heater Control System

HEATED OXYGEN SENSOR-1 AND -2 HEATER CONTROL SYSTEM
This system controls operation (ON/OFF) of the heater which assists activation of the oxygen sensor. ECM (PCM) turns the HO2S-1 heater ON (to allow the electric current to flow to the oxygen sensor heater) when the engine is running without high-load and high-speed condition, and turns the HO2S-2 heater ON after the vehicle ran with specified load and specified time.