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DTC P1112 - IAT SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE Oldsmobile Eighty-Eight X

Testing & Diagnostics

Note. For circuit reference, see DTC P1111 schematic.

Circuit Description

Intake Air Temperature (IAT) sensor is a thermistor. PCM applies and reads 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.