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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P1133: Ho2S Insufficient Switching - Bank 1; Sensor 1 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Powertrain Control Module (PCM) continuously monitors Heated Oxygen Sensor (HO2S) activity for 100 seconds. During the monitor period, PCM counts the number of times HO2S transitions from rich-to-lean and from lean-to-rich and adds the amount of time it took to complete all transitions. With this information, an average time for all transitions can be determined. PCM then divides rich to lean average by the lean to rich average to obtain a ratio. If the HO2S transition time ratio is not within range, DTC P1133 will set, indicating oxygen sensor is not responding as expected to changes in exhaust oxygen content.

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