AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5]

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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 [MZR 1.8, MZR 2.0, MZR 2.5].)

A/F Sensor Heater Inspection

1.  Disconnect the negative battery cable.

2.  Disconnect the A/F sensor connector.

3.  Measure the resistance between the following terminals:

•  A/F sensor terminals A and E (MZR 1.8, MZR 2.0)

•  A/F sensor terminals 2B and 2D (MZR 2.5)

―  If not as specified, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)

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