The IAT (Intake Air Temperature) sensor is a thermistor that varies its resistance as a function of temperature. This sensor is sometimes integrated in the MAF sensor (Mass Air Flow Sensor) or is located in the air filter duct housing.
The PCM(Power Train Control Module) controls the air temperature entering the engine. The IAT sensor has 5 volts reference which is supplied by the PCM (Powertrain Control Module). Because the resistance of the IAT sensor changes according to the temperature, when the temperature raises, the resistance drops. If the temperature drops, there may be a high signal voltage. In the event that the Power Train Control Module observes that the signal voltage is above 5 volts, the fault codeP0113 OBD2 is established.
The factors that can lead to the establishment of error code P0113 OBDII can be:
It is possible that the Intake Air Temperature (IAT) Sensor or the cables related to this sensor, are rubbing with components such as alternator or spark plug wires.
The electrical connection of the Intake Air Temperature (IAT) sensor may be defective.
There is a possible short to ground of the IAT sensor signal.
The reference signal circuit of the IAT sensor may be short.
The Intake Air Temperature Sensor may be failing internally.
Possible solutions of the DTC code P0113 Generic
To solve the diagnostic code P0113 OBD2 you can do the following:
With a scan tool, verify that the reading of the IAT sensor (Intake Air Temperature) sensor is within the established parameters, if so, the problem is intermittent.
In case the reading is below -30 degrees, disconnect the IAT Next, make a bridge between the harness connector signal and the ground circuits. Re-measure the IAT sensor and the result should be that at the upper end it should be 280 ° F or more. If so, the problem is in the electrical connection.
If you do not get any reading of the IAT sensor with the scan tool, you should measure with a digital multimeter on the volt scale; check the presence of the 5 volts reference. If there are 5 volts, check for continuity in the signal circuit of the Intake Air Temperature sensor between the PCM connector and the IAT