P1114 – Intake Air Temperature Sensor 2 Circuit Low

P1114 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1114 Possible Causes

Faulty Intake Air Temperature Sensor 2,Intake Air Temperature Sensor 2 harness is open or shorted,Intake Air Temperature Sensor 2 circuit poor electrical connection,Damaged Powertrain Control Module (PCM)

P1114 Description

The IAT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature. Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor. The IAT sensor provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of fuel, spark, and air flow. The IAT sensor provides a quicker temperature change response time than the ECT or CHT sensor. Currently there are 2 types of IAT sensors used, a stand alone, non-integrated type and an integrated type. Both types function the same, however the integrated type is incorporated into the mass air flow (MAF) sensor instead of being a stand-alone sensor.