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Home >> Cadillac >> 2007 >> XLR V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0010 To DTC P0154 >> DTC P012C or P012D >> Circuit/System Verification

Circuit/System Verification

  1. If DTCs P0641 or P0651 are set, refer to DTC P0641 or P0651 .
  2. Verify the integrity of the SCIAP sensor system by inspecting for the following conditions:
    • Any damage to the SCIAP sensor housing
    • A loose or improperly installed SCIAP sensor
    • A restriction in the vacuum source of the SCIAP sensor
  3. Ignition ON, observe the scan tool SC Inlet Pressure Sensor parameter. The reading should be BARO. Refer to Altitude Versus Barometric Pressure .
  4. Engine running at idle, observe the scan tool SC Inlet Pressure Sensor parameter. The reading should CLOSELY match the MAP sensor value.
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