AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L8, LF, L5]

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A/F Sensor Current 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, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L8, LF, L5].)

A/F Sensor heater resistance inspection

1.  Disconnect the A/F sensor connector.

2.  Measure the resistance between A/F sensor terminals A and E.

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•  If not as specified, replace the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L8, LF, L5].)

HO2S voltage 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 AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L8, LF, L5].)

HO2S heater resistance inspection

1.  Disconnect the HO2S connector.

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

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•  If not as specified, replace the HO2S.

(See AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L8, LF, L5].)