Heated Oxygen Sensor (HO2S) Inspection

HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZR 1.5]

HO2S 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.






- If not as specified, replace the HO2S. Heated Oxygen Sensor (HO2S) Removal/Installation

HO2S Heater Inspection

1. Disconnect the HO2S connector.

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






- If not as specified, replace the HO2S. Heated Oxygen Sensor (HO2S) Removal/Installation

HO2S heater resistance
- 2-50 ohms