Swift L4-1298cc 1.3L SOHC MFI (1997)
Heated Oxygen Sensor (HO2S): Description and Operation
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.