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Home >> Mazda >> 2005 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Intake Air Temperature (IAT) Sensor Inspection >> Inspection of Resistance
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Inspection of Resistance

NOTE:
  • Perform the following test only when directed.
  1. Disconnect the IAT sensor connector.
  2. Remove the IAT sensor.
  3. Place the IAT sensor in water with a thermometer, and heat the water gradually.
    Fig 1: Measuring Resistance Of IAT Sensor
    G03637990Courtesy of MAZDA MOTORS CORP.
  4. Measure the resistance of the IAT sensor using an ohmmeter.
    • If IAT sensor is okay, but PID value is out of specification, perform the CIRCUIT OPEN/SHORT INSPECTION .
    • If not as specified, replace the IAT sensor.

    Specification 

    Water temperature (°C {°F}) Resistance (kilohm)
    20 {68} 2.21-2.69
    80 (176} 0.29-0.354
  5. Reconnect the IAT sensor connector.
    Fig 2: IAT Sensor Signal Graph
    G03637991Courtesy of MAZDA MOTORS CORP.
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