DTC P0112 Intake Air Temperature Circuit Low Input

DTC DETECTING CONDITION:

Immediately at fault recognition
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: Wiring Diagram - Intake Air Temperature Circuit (Low Input)

Courtesy of SUBARU OF AMERICA, INC.

DTC P0112 DIAGNOSTIC PROCEDURE

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 the OBD-II general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA SHOWN ON DISPLAY FOR ENGINE" in SUBARU SELECT MONITOR . OBD-II general scan tool For detailed operation procedure, refer to the OBD-II GENERAL SCAN TOOL Instruction Manual.	Is the temperature more than 55°C (131°F)?	Go to step 2 .	Repair the poor contact. NOTE: In this case, repair the following: Poor contact mass air flow and intake air temperature sensor Poor contact in ECM Poor contact in joint connector
2 CHECK HARNESS BETWEEN MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR AND ECM CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from mass air flow and intake air temperature sensor. Turn the ignition switch to ON. Read the data of intake air temperature sensor signal using Subaru Select Monitor or the OBD-II general scan tool. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA SHOWN ON DISPLAY FOR ENGINE" in SUBARU SELECT MONITOR . OBD-II general scan tool For detailed operation procedure, refer to the OBD-II GENERAL SCAN TOOL Instruction Manual.	Is the temperature less than -36°C (-33°F)?	Replace the mass air flow and intake air temperature sensor. < Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . >	Repair the ground short circuit in harness between mass air flow and intake air temperature sensor and ECM connector.