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2008 - MX-5 - Engine

FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION [LF]

NOTE:

Front HO2S Current 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 front HO2S current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure.

Front HO2S Heater Resistance Inspection

1. Disconnect the front HO2S connector.
2. Measure the resistance between front HO2S terminals C and D.

Front HO2S Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF].)
2. Disconnect the front HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)



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