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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Controls - Theory & Operation - 3.3L Gasoline) >> Computerized Engine Controls >> Input Devices >> Heated Oxygen Sensor (HO2S)

Heated Oxygen Sensor (HO2S)

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.

O2S sensor produces a small electrical voltage (0-1 volt) when exposed to heated exhaust gas. O2S sensor is electrically heated for faster warm-up. Heating element is powered through Auto Shutdown (ASD) relay.

O2S sensor acts like a rich/lean (air/fuel ratio) switch by monitoring oxygen content in exhaust gas. This information is used by PCM to adjust air/fuel ratio by adjusting injector pulse width.

O2S sensor produces low voltage when oxygen content in exhaust gas is high. When oxygen content in exhaust gas is low, O2S sensor produces a higher voltage.

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