3 L4-2.5L (2010)
Oxygen Sensor: Testing and Inspection
Heated Oxygen Sensor (HO2S) Inspection
HEATED OXYGEN SENSOR (HO2S) INSPECTION [LF, L5]
HO2S Inspection
1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following:
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Vehicle speed (PID: VSS)
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Engine speed (PID: RPM)
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HO2S voltage (PID: O2S12)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.
4. Verify that the HO2S outputs a voltage of 0.6 V or more, one time or more, then verify that the HO2S voltage (PID: O2S12) is 0.3 V or less
while decelerating as shown in the figure.
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If not as specified, replace the HO2S.
See: Service and Repair/Heated Oxygen Sensor (HO2S) Removal/Installation
HO2S Heater Inspection
1. Remove the battery cover. See: Starting and Charging/Battery/Service and Repair/Removal and Replacement
2. Disconnect the negative battery cable.
3. Disconnect the HO2S connector.
4. Measure the HO2S resistance between terminals C and D.
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If not as specified, replace the HO2S.
See: Service and Repair/Heated Oxygen Sensor (HO2S) Removal/Installation
