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Intake Air Temperature Sensor: MPV

  1. Resistance Inspection

    Intake Air temperature (IAT) sensor is part of Mass Airflow (MAF) sensor. Disconnect MAF/IAT sensor connector. Using ohmmeter, measure resistance between MAF/IAT sensor terminals "A" and "F", located at each end of connector. See IAT SENSOR RESISTANCE SPECIFICATIONS (MPV)  table. If resistance is not as specified, replace MAF/IAT sensor. If IAT sensor is within specification but PID value is out of specification, check for open or short in wiring between IAT sensor connector terminals and PCM. Go to next step.
    IAT SENSOR RESISTANCE (MPV)

    Temperature - °F (°C) Ohms
    50 (10) 3300-4100
    68 (20) 2200-2700
    86 (30) 1400-1900

  2. Open Circuit Inspection

    Check for continuity between MAF/IAT sensor harness connector terminal "A" and breakout box terminal No. 91 (Brown/Yellow wire) and between terminal "F" and No. 39 (Violet wire). If continuity is not present, repair or replace open wiring harness as necessary.

  3. Short Circuit Inspection

    Check for continuity between MAF/IAT sensor harness connector terminals "A" (Brown/Yellow wire) and "F" (Violet wire) to power. Check for continuity between MAF/IAT sensor harness connector terminal "F" (Violet wire) and ground. If continuity is present, repair or replace shorted wiring harness as necessary.
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