DTC P0112 Intake Air Temperature Circuit Low Input

DTC DETECTING CONDITION:

Detect as soon as malfunction occurs.
GENERAL DESCRIPTION < Ref. to DTC P0112 INTAKE AIR TEMPERATURE CIRCUIT LOW INPUT , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Erroneous idling
Poor driving performance

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode.> and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode.>.

WIRING DIAGRAM:

Fig 1: DTC P0112 Intake Air Temperature Circuit Low Input

Courtesy of SUBARU OF AMERICA, INC.

DTC P0112 INTAKE AIR TEMPERATURE CIRCUIT LOW INPUT DIAGNOSIS

Step	Check	Yes	No
1. CHECK CURRENT DATA. Start the engine. Read the data of intake air temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . > OBD-II general scan tool For detailed operation procedure, refer to the OBD-II general scan tool instruction manual .	Is the measured value more than 120°C(248°F)?	Go to step 2.	Repair poor contact. NOTE: In this case, repair the following: Poor contact in intake air temperature sensor Poor contact in ECM Poor contact in coupling connector Poor contact in joint connector
2. CHECK HARNESS BETWEEN INTAKE AIR TEMPERATURE SENSOR AND ECM CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from intake air temperature sensor. Turn the ignition switch to ON. Read the data of intake air temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . > OBD-II general scan tool For detailed operation procedure, refer to the OBD-II general scan tool instruction manual .	Is the measured value less than -40°C (-40°F)?	Replace the intake air temperature sensor.< Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . >	Repair ground short circuit in harness between intake air temperature sensor and ECM connector.