P0136

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

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

1. Turn ignition switch OFF. Clear DTC with ignition switch ON, check vehicle and environmental condition for:
- Indication of fuel level meter in combination meter: 1/4 or more
- Altitude (barometric pressure): 2400m, 8000ft or less (560mmHg, 75 kPa or more)
- Ambient temp.: 10°C, 14°F or higher
- Intake air temp.: 50°C, 122°F or lower
- No exhaust gas leakage and loose connection
2. Warm up engine to normal operating temperature.
3. Drive vehicle under usual driving condition for 5 min. and check HO2S-2 output voltage and "short term fuel trim" with "Data List" mode on scan tool, and write it down.
4. Stop vehicle (don't turn ignition switch OFF).
5. Increase vehicle speed to higher than 20mph, 32km/h and then stop vehicle.
6. Repeat above step 5 (9 times).
7. Increase vehicle speed to about 50mph (80km/h) in 3rd gear or 2 range.
8. Release accelerator pedal and with engine brake applied, keep vehicle coasting (fuel cut condition) for 10 sec. or more.
9. Stop vehicle (don't turn ignition switch OFF) and run engine at idle for 2 min. After this step 9, if "Oxygen Sensor Monitoring TEST COMPLETED" is displayed in "READINESS TESTS" mode and DTC is not displayed in "DTC" mode, confirmation test is completed. If "TEST NOT COMPLTD" is still being displayed, proceed to next step 10.
10. Drive vehicle under usual driving condition for 10min. (or vehicle is at a stop and run engine at idle for 10 min. or longer)
11. Stop vehicle (don't turn ignition switch OFF). Confirm test results according to "Test Result Confirmation Flow Chart".





INSPECTION