P1112
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Expert Gearhead
Joined: May 2006
Posts: 29,661
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From: Sheboygan Wisconsin
P1112
P1112
Description
IAT SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE
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.
Symptoms
You likely won't notice any drivability problems.
Causes
Description
IAT SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE
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.
Symptoms
You likely won't notice any drivability problems.
Causes
- IAT sensor voltage intermittently less than 0.14 volt.
- If DTC P0112 is also set, diagnose DTC P0112 before
proceeding. - Check for faulty connections or damaged harness.
- Replace IAT sensor
