P0135

Wiring Diagram:

CIRCUIT DESCRIPTION
This system controls operation (ON/OFF) of each heater which assists activation of each oxygen sensor. ECM (PCM) turns the each heater of oxygen sensor-1 and -2 ON (to allow the electric current to flow to the oxygen sensor heater) when the engine is running without high-load condition after specified time from engine start.

Detecting Condition / Possible Cause:

DTC CONFIRMATION PROCEDURE

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester.

1. Turn ignition switch OFF.
2. Clear DTC with ignition switch ON, start engine and keep it at idle for 1 min.
3. Start vehicle and depress accelerator pedal fully for 5 sec. or longer.
4. Stop vehicle
5. Check DTC in "DTC" mode and pending DTC in "ON BOARD TEST" or "PENDING DTC" mode.

Step 1 - 3: