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A/F Sensor 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)

― A/F sensor current (PID: O2S11)

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 A/F sensor current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure.

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• If not as specified, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].)

A/F Sensor Heater Inspection

1.Disconnect the negative battery cable.

2.Disconnect the A/F sensor connector.

3.Measure the resistance between A/F sensor terminals 2B and 2D.

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• If not as specified, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].)