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DTC P0112: Intake Air Temperature Sensor Low: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read the IAT voltage. Is the voltage below 1.0 volt? If yes, go to next step. If no, go to step  6.
  2. Turn the ignition off. Disconnect the IAT harness connector. Turn ignition on, engine not running. With the DRBIII®, read IAT 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 PCM harness connectors. Measure the resistance between ground and the IAT Sensor Signal circuit at the IAT Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the IAT Sensor Signal circuit. If no, go to next step.
  4. Measure the resistance between the IAT Sensor Signal circuit and the Sensor Ground circuit at the IAT Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the IAT Sensor Signal circuit. If no, go to next step.
    5. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  5. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    6. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  6. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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