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Wiring diagrams Section: Testing & Diagnostics

Engine Controls - 3.5L - Introduction (1 of 2)

Engine Controls - 3.9L - Introduction (1 of 2)

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P0131 (2) Chevrolet Uplander I

Testing & Diagnostics

The engine control module (ECM) detects that the HO2S 1 signal voltage is less than 78 mV for more than 51 seconds. OR
The ECM detects that the HO2S 1 signal voltage is less than 598 mV during PE mode for more than 7.5 seconds.
This diagnostic runs continuously.