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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Control System & Fuel System - 5.3L - DTC P0420 To DTC P3449) >> DTC P0641 or P0651 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, observe the scan tool 5-volt reference 1 and 2 parameters. The reading should display Circuit OK for a normally operating system.

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