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Home >> Eagle >> 1995 >> Summit DL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - OBD-II (2.4L) >> Diagnostic Tests >> Code P0110: IAT Sensor Circuit Failure
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Code P0110: IAT Sensor Circuit Failure

NOTE: IAT sensor is built into airflow sensor. For CODE P0110 test purposes, airflow sensor will be referred to as IAT sensor. For component terminal identification, see AIRFLOW SENSOR in the TERMINAL IDENTIFICATION  table. For wiring diagrams, see WIRING DIAGRAMS  section.
  1. If using scan tool, go to step 3). Disconnect IAT sensor connector. Using a thermometer, check engine compartment ambient temperature. Using DVOM, check resistance between specified IAT sensor terminals. See IAT SENSOR TERMINAL IDENTIFICATION  table. Resistance should be 6000 ohms at 32°F (0°C), 2700 ohms at 68°F (20°C) or 400 ohms at 176°F (80°C). If resistance is not as specified, replace IAT sensor. If resistance is as specified, go to next step.
    IAT SENSOR TERMINAL IDENTIFICATION

    Application Terminals No.
    2.4L 5 & 6
  2. Using a hair dryer, warm IAT sensor while monitoring DVOM. Resistance should decrease evenly as temperature rises. If resistance remains unchanged, replace IAT sensor. If resistance changes, go to step 4).
  3. Turn ignition switch to ON or RUN position. Using a thermometer, check engine compartment ambient temperature. Using scan tool, read IAT sensor temperature. See IAT SENSOR TEMPERATURE  table. If temperatures are not as specified, replace IAT sensor. If temperatures are as specified, go to next step.
    IAT SENSOR TEMPERATURE

    Ambient Temperature Standard Value
    -4°F (-20°C) -20°C
    32°F (0°C) 0°C
    68°F (20°C) 20°C
    104°F (40°C 40°C
    176°F (80°C) 80°C
  4. Disconnect IAT sensor connector. Using DVOM, check for continuity between chassis ground and specified IAT sensor connector terminal. See IAT SENSOR GROUND CIRCUIT TERMINAL IDENTIFICATION  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    IAT SENSOR GROUND CIRCUIT TERMINAL IDENTIFICATION

    Application Terminal No.
    2.4L 5
  5. With IAT sensor connector and PCM connector disconnected, ground PCM connector terminal No. 52. Check for continuity between specified IAT sensor connector terminal and chassis ground. See IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID

    Application Terminal No.
    2.4L 6
  6. Turn ignition switch to ON position. Check voltage between chassis ground and specified IAT sensor connector. See IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID  table. If voltage is not 4.5-4.9 volts, replace PCM. If voltage is as specified, replace IAT sensor.
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