P0131

Wiring Diagram:

CIRCUIT DESCRIPTION




HEATED OXYGEN SENSOR-1 (HO2S-1)
The oxygen sensor is installed on the exhaust manifold (pre-catalyst) to detect the concentration of oxygen in the exhaust gases.

The oxygen sensor heater promotes activation of the oxygen sensor.

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)
- Fuel level Indication on meter cluster: 1/4 or more

1. Connect scan tool to DLC with ignition switch OFF.
2. Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool and start engine.
3. Increase vehicle speed to 55 km/h (35 mph) or more.
4. Keep driving above vehicle speed for 2 min. or more (Change of vehicle speed is permitted in this step).
5. Stop vehicle, and run engine at idle speed for 1 min.
6. Check if pending DTC exists by using scan tool. If not, check if oxygen sensor monitoring test has completed by using scan tool. If not in both of above checks (i.e., no pending DTC and oxygen sensor monitoring test not completed), check vehicle condition (environmental) and repeat step 3) through 6).

Step 1 - 3:

Step 4:

Fig. For Step 2:

TROUBLESHOOTING