P1111
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P1111
P1111
Description
IAT SENSOR CIRCUIT INTERMITTENT HIGH 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 HIGH 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.
You likely won't notice any drivability problems.
Causes
- IAT intermittently less than -38F (-39C).
- If DTC P0113 is also set, diagnose DTC P0113 before
proceeding. - Check for faulty sensor ground circuit terminal at IAT
sensor. - Check for faulty signal circuit connection at IAT sensor.
Repair as necessary. - Check for intermittent open or faulty splice in sensor
ground circuit. - Check for faulty connections or damaged harness.
- Replace IAT sensor.