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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor and the IAT sensor 2.
  2. Ignition OFF and scan tool disconnected for 90 seconds, test for less than 5Ω between the IAT sensor low reference circuit terminal A 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 5Ω 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 X2 and X3 harness connectors at the ECM.
  5. Test for less than 5 Ω between the signal circuit terminal B of the IAT sensor and the corresponding terminal 62 X2 of the ECM.
    • If greater than the specified range, repair the open/high resistance in the circuit.
  6. Test for less than 5 Ω between the signal circuit terminal A of the IAT sensor 2 and the corresponding terminal 56 X3 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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