P0136

Wiring Diagram:

CIRCUIT DESCRIPTION




HEATED OXYGEN SENSOR-2 (HO2S-2)
The oxygen sensor is installed on the exhaust pipe (post-catalyst) to detect the concentration of oxygen in the exhaust gases just like HO2S-1.

ECM (PCM) judges deterioration of TWC (three way catalytic converter) by comparing waveforms of the output voltage from HO2S-1 and HO2S-2.

DTC Detecting Condition And Trouble Area:

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, on a level road.

NOTE: Check to make sure that following conditions are satisfied when using this "DTC CONFIRMATION PROCEDURE".
- Intake air temp.: -8 °C (18 °F) or higher
- Engine coolant temp.: -8 - 110 °C (18 - 230 °F)
- Altitude (barometric pressure) : 2400 m, 8000 ft or less (560 mmHg (75 kPa) or more)
- Indication of fuel level meter in combination meter: 1/4 or more

1. Connect scan tool with ignition switch OFF.
2. Turn ON ignition switch and clear DTC, pending DTC and freeze frame data in ECM memory by using scan tool and start engine.
3. Increase vehicle speed to 55 km/h (40 mph) or more.
4. keep driving above vehicle speed till engine is warmed up completely (Changed of vehicle speed is permitted in this step)
5. keep driving 50 - 60 km/h (30 - 40 mph) for 8 min. or more.
6. Stop vehicle and check if pending DTC exists by using scan tool. If not, check if oxygen sensor heater monitoring test has completed by using scan tool. If not in both of above checks (i.e., no pending DTC and oxygen sensor heater monitoring test not completed), check vehicle conditions (environmental) and repeat Steps 3) through 6).

Step 1 - 4:

TROUBLESHOOTING