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Home >> Buick >> 2006 >> Lucerne CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.6L - DTC P0403 To DTC P1381 >> DTC P0451 >> Circuit/System Verification

Circuit/System Verification

  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 20 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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