Mazda 2: Air Fuel Ratio (A/F) Sensor

Mazda 2 2007-2014 Service Manual / Engine / Control System / Air Fuel Ratio (A/F) Sensor

AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION

WARNING:

1. Disconnect the negative battery cable.

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

3. Disconnect the A/F sensor connector.

4. Remove the A/F sensor using the SST.

Mazda 2. AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION

5. Install in the reverse order of removal.

AIR FUEL RATIO (A/F) SENSOR INSPECTION

A/F Sensor 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 A/F sensor current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure.

Mazda 2. AIR FUEL RATIO (A/F) SENSOR INSPECTION

A/F Sensor Heater Inspection

1. Disconnect the A/F sensor connector.

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

Mazda 2. AIR FUEL RATIO (A/F) SENSOR INSPECTION

A/F sensor heater resistance

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