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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 150 (Engine Control System - 3.6L (Ly7) - DTC P0442 To DTC P1551) >> DTC P0685, P0686, P0687, P0689 or P0690 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Ignition ON, observe the DTC information with a scan tool.
  4. View the DTC information with a scan tool. DTCs P0685, P0686, P0687, P0689 or P0690 should not set.
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