S Check Using a Digital Multimeter

If a digital multimeter (DMM) is used, like the Fluke 80 series, set up the meter as follows:

• Select the MIN/MAX feature

• Press the MIN/MAX button to toggle between maximum, minimum, and average signal voltage

Tests can be performed by connecting your test instrument to the OX1 / OX2 terminal of DLC1, or by back probing directly at the oxygen sensor connector.

Many factors can contribute to the degradation of the oxygen sensor including age and contamination. Since this topic relates closely with catalytic converter operation, it will be discussed in detail later.

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