DTC P0113: Intake Air Temperature (IAT) Sensor Circuit High Input

Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . Start engine. Using scan tool, observe intake air temperature (IAT) sensor signal. If temperature reads less than -40°F (-40°C), go to next step. If temperature does not read less than -40°F (-40°C), repair poor terminal contact in connectors between ECM and IAT sensor. See WIRING DIAGRAMS article.
Turn ignition off. Disconnect IAT sensor connector. Using DVOM connected to ground, check voltage at IAT sensor connector terminal No. 1. See Fig 1 . If voltage is more than 10 volts, locate and repair short to voltage in wiring between ECM and IAT sensor. If voltage is not more than 10 volts, go to next step.
Turn ignition on. Measure voltage between IAT sensor connector terminal No. 1 and ground. If voltage is more than 10 volts, locate and repair short to voltage in wiring between ECM and IAT sensor. If voltage is not more than 10 volts, go to next step.
Measure voltage between IAT sensor connector terminal No. 1 and ground. If voltage is more than 3 volts, go to next step. If voltage is not more than 3 volts, locate and repair open circuit in wiring and check for poor terminal contact in connectors between ECM and IAT sensor.
Turn ignition off. Measure resistance between ground and IAT sensor connector terminal No. 2. If resistance is less than 5 ohms, replace IAT sensor. If resistance is not less than 5 ohms, locate and repair open circuit in wiring and check for poor terminal contact in connectors between ECM and IAT sensor. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES and VERIFICATION PROCEDURE .

Fig 1: 2-Pin Connector Terminal Identification
Courtesy of SUBARU OF AMERICA, INC.