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Home >> Buick >> 2009 >> Allure Super >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L - DTC P0420 To DTC P3449 >> DTC P3400 >> Circuit/System Testing >> Mechanical System Testing

Mechanical System Testing

Refer to Cylinder Deactivation (Active Fuel Management) System Diagnosis .