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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor and the IAT sensor 2.
  2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the IAT sensor low reference circuit terminal D and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, allow sufficient time for the control module to power down. Test for less than 5 ohms of resistance between the IAT sensor 2 low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, disconnect the harness connector at the ECM.
  5. Test for less than 5 ohms of resistance between the signal circuit terminal of the IAT sensor and the corresponding terminal E of the ECM.
    • If greater than the specified range, repair the open/high resistance in the circuit.
  6. Test for less than 5 ohms of resistance between the signal circuit terminal of the IAT sensor 2 and the corresponding terminal of the ECM.
    • If greater than the specified range, repair the open/high resistance in the circuit.
  7. If all circuits test normal, test or replace the affected sensor.
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