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Home >> Cadillac >> 2009 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0153 To DTC P0651 >> DTC P023A >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON, command the CAC coolant pump relay ON and OFF several times with a scan tool. Listen and feel for the CAC coolant pump relay to click with each command.
  2. 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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