P0134
COMPONENT DESCRIPTION
The heated oxygen sensor 1 (front) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 (front) 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 (front) 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:
ECM Terminals And Reference Value:
ON BOARD DIAGNOSIS LOGIC
To judge the malfunction, the diagnosis checks that the heated oxygen sensor 1 (front) output is not inordinately high.
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.
With Consult
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.
OR
With Generic Scan Tools
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 because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis. Therefore, using CONSULT-II is recommended.
EC-HO2S1-01:
EC-HO2S1-01 Connector View:
WIRING DIAGRAM
DIAGNOSTIC PROCEDURE
COMPONENT INSPECTION
Heated oxygen sensor 1 (front)
With Consult
1. Start engine and warm it up to normal operating temperature.
2. Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode with CONSULT-II, and select "HO2S1 (B1)" and "HO2S1 MNTR (B1)".
3. Hold engine speed at 2,000 rpm under no load during the following steps.
4. Touch "RECORD" on CONSULT-II screen.
5. Check the following.
- "HO2S1 MNTR (B1)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds.
5 times (cycles) are counted as shown below:
cycle 1 | 2 | 3 | 4 | 5 |
HO2S1 MNTR (B1) R-L-R-L-R-L-R-L-R-L-R
R = "HO2S1 MNTR (B1)", "RICH"
L = "HO2S1 MNTR (B1)", "LEAN"
- "HO2S1 (B1)" voltage goes above 0.6 V at least once.
- "HO2S1 (B1)" voltage goes below 0.35 V at least once.
- "HO2S1 (B1)" voltage never exceeds 1.0 V.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
OR
Without Consult
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal (46) (sensor signal) and engine ground.
3. Check the following with engine speed held at 2,000 rpm constant under no load.
- The voltage fluctuates between 0 to 0.35 V and 0.6 to 1.0 V more than five times within 10 seconds.
1 time: 0 - 0.35 V -> 0.6 - 1.0 V -> 0 - 0.35 V
2 times: 0 - 0.35 V -> 0.6 - 1.0 V -> 0 - 0.35 V -> 0.6 - 1.0 V -> 0 - 0.35 V
- The maximum voltage is over 0.6 V at least one time.
- The minimum voltage is below 0.35 V at least one time.
- The voltage never exceeds 1.0 V.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.