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Home › Buick › 2006 › Lucerne CXS › Repair and Diagnosis › Engine Performance › System › Engine Controls - 4.6L - DTC P1400 To DTC P2444 › DTC P2444 › Circuit/System Verification

Circuit/System Verification

  1. If DTCs P0411, P0418, P0641, P0651, P2432 or P2433 are set then perform those diagnostics first.
  2. Ignition ON, observe that the AIR pump is not activated.
    • If the AIR pump is operating, test the AIR pump voltage supply circuit for a short to voltage. If the circuit tests normal, test the AIR pump relay control circuit for a short to ground. If the circuits test normal, test the AIR pump relay. If the relay and circuits test normal, replace the control module.
  3. Ignition ON, enable and disable the AIR pump relay with a scan tool, listen for the AIR pump to turn ON and OFF.
  4. Engine running, observe the DTC information with a scan tool. DTC P2444 should not set.
  5. 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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