P0134

Component Description
The front heated oxygen sensor is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The front heated oxygen sensor 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 front heated oxygen sensor 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 Mode
Specification data are reference values.




ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 43 (ECM ground).







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

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 35 seconds.
6. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 5 seconds.
3. Restart engine and let it idle for 35 seconds.
4. Turn ignition switch OFF and wait at least 5 seconds.
5. Restart engine and let it idle for 35 seconds.
6. Select "MODE 3" with GST.
7. If DTC is detected, go to "Diagnostic Procedure" below.
- When using GST, "DTC Confirmation Procedure" should be performed twice as much as when using CONSULT-II or ECM (Diagnostic Test Mode II) because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II or ECM (Diagnostic Test Mode II) is recommended.

EC-FRO2-01:

Wiring Diagram

Diagnostic Procedure

STEP 1 - 2:

Step 3:

Step 4:

Step 5 - 7: