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Home >> Oldsmobile >> 1995 >> Eighty-Eight Royale >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM/Pcm Code Charts >> DTC P0112: IAT Sensor Circuit Low Temperature Indicated >> Circuit Description
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Circuit Description

Intake Air Temperature (IAT) sensor is a thermistor. PCM applies and monitors a 5-volt reference signal to sensor. When air is cold, sensor resistance is high and PCM will measure a high signal voltage. If air is warm, sensor resistance is low causing PCM to measure low voltage.

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