Circuit Description: Notes
WARNING: This page is about a different variant/trim than selected.
The intake air temperature (IAT) sensor is an integral part of the mass air flow (MAF) sensor. The IAT sensor is a variable resistor that measures the temperature of the intake air. The engine control module (ECM) supplies 5 volts to the IAT signal circuit and supplies a ground to the low reference circuit. If the ECM detects a low IAT signal voltage, which is a high temperature indication, this DTC sets.
The following table illustrates the difference between temperature, resistance, and voltage:
DTC P0112
| IAT | IAT Resistance | IAT Signal Voltage |
|---|---|---|
| Cold | High | High |
| Warm | Low | Low |