ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0112 INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT LOW

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK CURRENT DATA.

1) Start the engine.

2) Read the data of intake air temperature sensor signal using Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

• General scan tool

For detailed operation procedure, refer to the general scan tool operation manual.

Is the temperature 55°C (131°F) or higher?

Repair the poor contact.

NOTE:

In this case, repair the following item:

• Poor contact in mass air flow and intake air temperature sensor

• Poor contact in ECM

• Poor contact of joint connector

2.CHECK HARNESS BETWEEN MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR AND ECM CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the mass air flow and intake air temperature sensor.

3) Turn the ignition switch to ON.

4) Read the data of intake air temperature sensor signal using Subaru Select Monitor or general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedure, refer to “READ CURRENT DATA FOR ENGINE”.

• General scan tool

For detailed operation procedure, refer to the general scan tool operation manual.

Is the temperature less than −36°C (−33°F)?

Replace the mass air flow and intake air temperature sensor.

Repair the ground short circuit of harness between mass air flow and intake air temperature sensor and ECM connector.