P0141

WIRING DIAGRAM

CIRCUIT DESCRIPTION
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 for specified time or more.





DETECTING CONDITION AND POSSIBLE CAUSE

DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF once and then ON.
2. Clear DTC, start engine and warm up engine to normal operating temperature.
3. Keep it at 3OOOr/min for 2 min. or longer.
4. Check pending DTC in "ON BOARD TEST" or "PENDING DTC" mode and DTC in "DTC" mode.





INSPECTION