P0113 IAT Sensor 1 Circuit High Input

Description and meaning of DTC p0113

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. The powertrain control module (PCM) monitors the temperature of the air enteringthe engine. The PCM supplies a 5 volt reference voltage to the Intake Air Temperature(IAT) sensorThe IAT is a thermistor that varies resistance based on temperature. As the temperature increases, resistance decreases. Low temperature resultsin a high signal voltage. When the PCM sees a signal voltage higher than 5 volts,it sets this P0113 check engine light code.

p0113 diagnostic trouble code symptoms

There will likely be no symptoms other than illumination of the MalfunctionIndicator Lamp (MIL - Check Engine Light / Service Engine Soon).

DTC p0113 - possible causes

A code P0113 may mean that one or more of the following has happened:Internally failed IAT sensor Faulty connection at IAT sensor Open in IAT ground circuit or signal circuit Short to voltage in IAT signal circuit or reference circuitIAT harness and/or wiring routed too close to high-voltage wiring (e. g. alternator, spark plug cables, etc. ) Faulty PCM (less likely but not impossible)

How to fix OBD-II diagnostic trouble code p0113

First, if you have access to a scan tool, is there an IAT reading? If the IATreading is logical then the problem is likely intermittent. If the reading isless than -30 degrees, unplug the connector. Install a jumper wire between theharness connector signal and ground circuits. The IAT temperature reading onthe scan tool should be maxed out at the high end. For example it should be280 degrees Farenheit or higher. If it is, the wiring is okay, and it may havebeen the connection. If it isn't install the jumper wire between the IAT signalcircuit and the chassis ground. If now the IAT reading on the scan tool is maxedout then check for an open in the IAT ground circuit. If you get no readingat all on the scan tool, it's likely that the sensor signal is open or the 5volt reference is missing. Check using a DVOM (digital volt ohm meter) for a5 volt reference. If it's there, then unplug the connector at the PCM and checkfor continuity on the IAT signal circuit between the PCM connector and the IATconnector. Other IAT sensor and circuit related DTCs: P0095, P0096, P0097, P0098, P0099, P0110, P0111, P0112, P0114, P0127

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