P0152

P0152 HO2S1







Component Description
The heated oxygen sensor 1 is placed into the front tube. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1 V in richer conditions to 0 V in leaner conditions. The heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1 V to 0 V.

Consult-II Reference Value In Data Monitor:

ECM Terminals And Reference Value:

On Board Diagnosis Logic
To judge the malfunction, the diagnosis checks that the heated oxygen sensor 1 output is not inordinately high.

Malfunction is detected when an excessively high voltage from the sensor is sent to ECM.

POSSIBLE CAUSE
- Harness or connectors
(The sensor circuit is open or shorted.)

- Heated oxygen sensor 1

DTC Confirmation Procedure

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting the next test.

With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 5 seconds.
3. Turn ignition switch ON.
4. Select "DATA MONITOR" mode with CONSULT-II.




5. Restart engine and let it idle for 25 seconds.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With GST
Follow the procedure "With CONSULT-II".
- When using GST, "DTC Confirmation Procedure" should be performed twice as much as when using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II is recommended.

EC-O2S1B1-01:

EC-O2S1B2-01:

Wiring Diagram

Diagnostic Procedure

Step 1 - 2:

Step 3 - 4:

Step 5:

Step 6 - 8: