HEATED OXYGEN SENSOR (HO2S) INSPECTION [L8, LF]

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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 within the specification, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L8, LF].)

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 within the specification, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L8, LF].)

  HO2S heater resistance

  2—50 ohms [normal temperature]