Heated Oxygen Sensor Heater Control System

This system controls operation (ON/OFF) of each heater which assists activation of each oxygen sensor. ECM turns the heater of oxygen sensor -1 ON (to allow the electric current to flow to the oxygen sensor heater) when the engine is running without high-load condition. For the heater of oxygen sensor-2, ECM turns it ON when the engine is running without high-load condition after engine running at specified speed for specified time or more.