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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 P0069 >> Circuit/System Testing
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Circuit/System Testing

  1. Determine the altitude for your area. Refer to Altitude Versus Barometric Pressure . Both sensor values should be within 5 kPa of each other and the Altitude vs. Barometric Pressure table.
  2. Ignition ON, determine which sensor is out of range by comparing SC Inlet Pressure and BARO Sensor kPa parameters with a scan tool.
  3. Ignition OFF, disconnect the harness connector at the affected sensor.
  4. Ignition OFF, allow sufficient time for the control module to power down. This can be verified by a no communication message on the scan tool. Test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit terminal A or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Verify the scan tool sensor parameter is less than 0.2 volt.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  7. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal A. Verify the scan tool sensor parameter is greater than 95 kPa for the SCIAP sensor or 199 kPa for the BARO sensor.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  8. If all circuits test normal, test the affected sensor. Refer to Component Test  for instructions.
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