AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR-CD 2.2]

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Note

•  Before performing the following inspection, make sure to follow the troubleshooting flowchart.

A/F Sensor Inspection

1.  Connect the M-MDS to the DLC-2.

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2.  Switch the ignition to ON.

3.  Warm up the engine to normal operating temperature.

4.  Access the following PIDs using the M-MDS.

―  VSS (Vehicle speed)

―  RPM (Engine speed)

―  O2S11 (A/F sensor output current)

5.  Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.

6.  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 as specified, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR-CD 2.2].)

A/F Sensor Heater Inspection

Warning

•  A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.

1.  Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)

2.  Remove the tunnel member. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [MZR-CD 2.2].)

3.  Disconnect the A/F sensor connector.

4.  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 [MZR-CD 2.2].)