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Home >> Cadillac >> 2009 >> STS V >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.4L - DTC P0010 To DTC P0158 >> DTC P0111 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit of the IAT Sensor terminal D and ground.
    • If greater than the specified range, test the low reference circuit for high resistance. If the circuit tests normal, replace the ECM.
  3. Disconnect the harness connector at the IAT sensor 2.
  4. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit of the IAT sensor 2 terminal B and ground.
    • If greater than the specified range, test the low reference circuit for high resistance. If the circuit tests normal, replace the ECM.
  5. Disconnect the harness connector at the ECM.
  6. Test for less than 5 ohms between the IAT Sensor signal circuit terminal E and the corresponding terminal at the ECM.
    • If greater than the specified range, repair the high resistance on the signal circuit.
  7. Test for less than 5 ohms between the IAT sensor 2 signal circuit terminal A and the corresponding terminal at the ECM.
    • If greater than the specified range, repair the high resistance on the signal circuit.
  8. If all circuits test normal, test or replace the affected temperature sensor.
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