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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Controls - 3.6L - Diagnosis (DTC P2188 - P2636)) >> Engine Controls Diagnosis >> DTC P2270 or P2272 >> Conditions for Setting the DTC

Conditions for Setting the DTC

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If the ECM detects that the rear HO2S voltage is less than 650 mV for more than 100 seconds, then an intrusive test is performed. The ECM will enrich the fuel mixture up to 30 percent and then wait for 10 seconds at 30 percent. If the ECM detects that the HO2S voltage is still less than 650 mV, this DTC sets.

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