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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Test for less than 5 ohms of resistance between the low reference circuit of the IAT 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. Test for less than 5 ohms of resistance 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 of resistance between the IAT 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 of resistance 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 the IAT sensor and the IAT sensor 2. Refer to Component Testing.
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