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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Engine Controls - 3.9L - DTC P0442 To P2A01) >> DTC P0451, P0452, P0453 or P0454 >> Circuit/System Verification >> P0451 and P0454

P0451 and P0454

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. If DTCs P0452, P0453 or P0641 are set, repair those first.
  2. With a scan tool, command the EVAP canister vent solenoid valve closed.
  3. Command the purge solenoid to 30 percent.
  4. Observe the FTP sensor voltage parameter as the vacuum increased to the abort limit.
  5. The voltage should scale smoothly.
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