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HO2S Inspection

1.Warm up the engine to normal operating temperature.

2.Using the M-MDS, monitor the following:

― Vehicle speed (PID: VSS)

― Engine speed (PID: RPM)

― 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 HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L5].)

HO2S Heater Inspection

1.Disconnect the negative battery cable.

2.Disconnect the HO2S connector.

3.Measure the HO2S resistance between terminals C and D.

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• If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L5].)