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Home >> Buick >> 2007 >> Lucerne CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - DTC P2444 To DTC P2544 >> DTC P2444 >> Circuit/System Verification
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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.
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