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Home >> Buick >> 2008 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0385 To DTC P2108 >> DTC P0641 or P0651 >> Circuit/System Verification >> P0641

Circuit/System Verification: P0641

Observe the MAP sensor voltage parameter with a scan tool with the ignition ON and the engine OFF. The scan tool should display 3.6-4.8 volts for a normally operating system.