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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls And Fuel - 4.6L - DTC P0351 To DTC P2440) >> DTC P0443 or P0449 >> Circuit/System Verification >> P0443

Circuit/System Verification: P0443

WARNING: This page is about a different variant/trim than selected.

With the ignition ON, engine OFF, you should hear a clicking sound when the EVAP canister purge solenoid valve is commanded to 50 percent with a scan tool. The clicking sound should stop when the EVAP canister purge solenoid valve is commanded to 0 percent. The rate at which the valve cycles should increase when the commanded state is increased, and decrease when the commanded state is decreased.

P0449

  1. With the ignition ON and the engine OFF, command the EVAP vent solenoid ON and OFF with a scan tool.
  2. Listen for a click when the valve operates. Verify that both the ON, and the OFF states are commanded.
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