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Home >> Pontiac >> 2007 >> Solstice GXP, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls & Fuel - 2.4L - DTC P0420 To P2544) >> DTC P1174 >> Circuit/System Description

Circuit/System Description

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The Fuel Trim Cylinder Balance diagnostic detects a rich or a lean cylinder-to-cylinder air/fuel ratio imbalance. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal's frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.

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