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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0112: Intake Air Temperature Sensor Circuit Low >> Testing

DTC P0112: Intake Air Temperature Sensor Circuit Low: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  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 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. 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. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  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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