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Home >> Buick >> 2008 >> Lucerne Super >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - DTC P0340 To DTC P2138 >> DTC P0412 or P0418 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, command the affected relay ON and OFF with a scan tool. Feel or listen to verify that the affected relay turns ON and OFF with each command.
  2. Engine running, observe the DTC information with a scan tool. DTCs P0412 or P0418 should not set.
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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