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Home >> Oldsmobile >> 2002 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.5L >> Diagnostic Tests >> DTC P1134: Ho2S Transition Time Ratio - Bank 1; Sensor 1 >> Circuit Description

Circuit Description

Heated Oxygen Sensor (HO2S) is used to detect oxygen content in the exhaust. The Powertrain Control Module (PCM) supplies HO2S with a signal circuit and a ground circuit. The PCM supplies a bias voltage between the circuits. The HO2S varies voltage based on oxygen content in the exhaust. When exhaust stream is lean (more oxygen), HO2S produces a low voltage signal. When exhaust stream is rich (less oxygen), HO2S produces a high voltage signal. The PCM monitors HO2S activity to determine a time ratio for lean-to-rich switches, and for rich-to-lean switches. The PCM counts number of lean-to-rich and rich-to-lean switches for 100 seconds. The PCM records time required to complete all transitions. With this information, PCM determines an average transition time for lean-to-rich switches and for rich-to-lean switches.

NOTE: HO2S bank 1; sensor 1 is located in right (rear) exhaust manifold.
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