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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P0016 - P049D)) >> Diagnostic Information And Procedures >> DTC P0171 Or P0172: Fuel System Lean/Rich >> Circuit/System Description

Circuit/System Description

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In order to compensate for variations in the fuel system, the fuel mass observer function adapts a correction quantity using the difference between the measured and modeled oxygen content of the exhaust gas coming from NOx Sensor 1. A DTC will set when the correction quantity reaches the maximum control limit. If the correction quantity is below the calibrated feedback limit for a specified time, the corresponding "Fuel System Lean" fault will be set. If the correction quantity is above the calibrated feedback limit for a specified time, the corresponding "Fuel System Rich" fault will be set.

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