Mitsubishi Galant/Mirage/Diamante 1990-2000

Intake Air Temperature Sensor

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OPERATION





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Fig. The IAT sensor tip is visible when looking into the MAF sensor

The Intake Air Temperature (IAT) sensor determines the air temperature entering the intake manifold. Resistance changes in response to the ambient air temperature. The sensor has a negative temperature coefficient. As the temperature of the sensor rises the resistance across the sensor decreases. This provides a signal to the PCM indicating the temperature of the incoming air charge. This sensor helps the PCM to determine spark timing and air/fuel ratio. Information from this sensor is added to the pressure sensor information to calculate the air mass being sent to the cylinders. The IAT receives a 5-volt reference signal and the signal return is based upon the change in the measured resistance due to temperature.

TESTING





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Fig. Testing the resistance of the IAT sensor across the two sensor pins



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Fig. The IAT sensor can be monitored with an appropriate and Data-stream capable scan tool



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