P0152
Component Description
The front heated oxygen sensor is placed into the front tube. 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.
On Board Diagnosis Logic
To judge the malfunction, the output from the front heated oxygen sensor is monitored to determine whether the "rich" output is sufficiently high. The "lean" output is sufficiently low. When both the outputs are shifting to the rich side, the malfunction will be detected.
Malfunction is detected when the maximum and minimum voltages from the sensor are beyond the specified voltages.
Possible Cause
- Front heated oxygen sensor
- Fuel pressure
- Injectors
- Front heated oxygen sensor heater
DTC Confirmation Procedure
CAUTION: Always drive vehicle at a safe speed.
NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.
TESTING CONDITION:
- Always perform at a temperature above -10° C (14° F).
- Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and wait at least 5 seconds.
3. Turn ignition switch "ON" and select "FR O2 SEN-B1 (-B2) P0132 (P0152)" of "FRONT O2 SENSOR" in "DTC WORK SUPPORT" mode with CONSULT-II.
4. Touch "START".
5. Start engine and let it idle for at least 3 minutes.
NOTE: Never raise engine speed above 3,600 rpm after this step. If the engine speed limit is exceeded, return to step 5.
6. When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take approximately 50 seconds or more.)
CMPS.RPM (POS) 1,200 - 2,600 rpm (A/T)
1,800 - 2,600 rpm (M/T)
Vehicle speed 80 - 100 KPH (50 - 62 MPH)
B/FUEL SCHDL 3 - 9 msec (A/T)
2.5 - 9 msec (M/T)
Selector lever Suitable position
If "TESTING" is not displayed after 5 minutes, retry from step 2.
7. Make sure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, refer to "Diagnostic Procedure" below.
Overall Function Check
Use this procedure to check the overall function of the front heated oxygen sensor circuit. During this check, a 1st trip DTC might not be confirmed .
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 63 (Right bank front HO2S signal) or 62 (Left bank front HO2S signal) and engine ground.
3. Check one of the following with engine speed held at 2,000 rpm constant under no load.
- The maximum voltage is below 0.8 V at least one time.
- The minimum voltage is below 0.35 V at least one time.
4. If NG, go to "Diagnostic Procedure" below.
Diagnostic Procedure
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