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DTC P0112: Intake Air Temperature Sensor Low: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read the IAT sensor voltage. Is the voltage below 1.0 volt? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the IAT harness connector. Ignition on, engine not running. With the DRBIII® scan tool, read IAT sensor voltage. Is the voltage above 1.0 volt? If yes, replace the IAT sensor. If no, go to next step.
  3. Turn the ignition off. Disconnect the IAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K21) IAT signal circuit at the IAT sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K21) IAT signal circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the IAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (K21) IAT sensor signal circuit and the (K4) sensor ground circuit in the IAT sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K4) sensor ground shorted to the (K21) IAT signal circuit. If no, go to next step.
  5. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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