General Information

P0112 Intake Air Temperature Sensor1 Circuit Low Input

General Information

Component Location





General Description

The Intake Air Temperature (IAT) sensor measures the temperature of engine intake air. The Intake Air Temperature (IAT) sensor is a thermistor (a variable resistor that changes along with outside air temperature) in series with a fixed resistor in the PCM. The PCM applies 5 V to the IAT sensor. The PCM monitors the voltage across the IAT sensor and converts it into a temperature reading. When the outside air temperature is cold the IAT sensor resistance is high, and when the outside air temperature is warm the IAT sensor resistance is low. Therefore, when the air temperature is cold the PCM will receive a high voltage input, and when the air temperature is warm the PCM will receive a low voltage input. The signal from IAT sensor is used for injection duration correction, ignition timing correction and idle speed correction (Air-density correction).

DTC Description

If measured temperature is higher than the maximum threshold value during 2 sec, ECM sets DTC P0112.
(In this case, the input signal voltage is the minimum threshold value.)

DTC Detecting Condition





Specification





Schematic Diagram