AIR FUEL RATIO (A/F) SENSOR INSPECTION [L8, LF]

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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 within the specification, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L8, LF].)

A/F Sensor Heater Resistance Inspection

1. Disconnect the A/F sensor connector.

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

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  • If not within the specification, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L8, LF].)

  A/F sensor heater resistance

  1—10 ohms [normal temperature]