Mazda 2: Heated Oxygen Sensor (HO2S)

Mazda 2 2007-2014 Service Manual / Engine / Control System / Heated Oxygen Sensor (HO2S)

HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION

WARNING:

1. Disconnect the negative battery cable.

2. Remove the air cleaner cover. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).

3. Disconnect the HO2S connector.

4. Remove the HO2S using the SST.

Mazda 2. HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION

5. Install in the reverse order of removal.

HEATED OXYGEN SENSOR (HO2S) INSPECTION

HO2S Inspection

1. Warm up the engine to normal operating temperature.

2. Using the M-MDS, monitor the following:

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.

Mazda 2. HEATED OXYGEN SENSOR (HO2S) INSPECTION

HO2S Heater Inspection

1. Disconnect the HO2S connector.

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

Mazda 2. HEATED OXYGEN SENSOR (HO2S) INSPECTION

HO2S heater resistance

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