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Home >> Eagle >> 1995 >> Summit DL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - OBD-I (2.4L) >> Diagnostic Tests >> Code 13: Intake Air Temperature Sensor
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Code 13: Intake Air Temperature Sensor

NOTE: Intake air temperature sensor is built into airflow sensor. For CODE 13 test purposes, airflow sensor will be referred to as intake air temperature sensor. For component terminal identification, see AIRFLOW SENSOR under TERMINAL IDENTIFICATION  in this article.
  1. If using scan tool, go to step 3). Disconnect Intake Air Temperature (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.
    All Models 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 Intake Air Temperature (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.
    All Models 5
  5. With IAT sensor connector and PCM connector disconnected, check for continuity between specified IAT sensor connector terminal and PCM connector terminal. See IAT-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    IAT-TO-PCM WIRING HARNESS TERMINAL IDENTIFICATION

    Application IAT Connector Terminal No. PCM Connector Terminal No.
    All Models 6 52
  6. Turn ignition switch to ON position. Check voltage between chassis ground and specified IAT sensor connector. See IAT SENSOR CONNECTOR VOLTAGE SUPPLY CKT TERMINAL ID  table. If voltage is not 4.5-4.9 volts, replace PCM. If voltage is as specified, replace IAT sensor.
    IAT SENSOR CONNECTOR VOLTAGE SUPPLY CIRCUIT TERMINAL ID

    Application Terminal No.
    All Models 6
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