ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0113 INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT HIGH

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

CAUTION:

After servicing or replacing faulty parts, perform 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” using the Subaru Select Monitor or a general scan tool.

NOTE:

• Subaru Select Monitor

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

• General scan tool

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

Is the data of “Intake Air Temperature” −40°C (−40°F)?

Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

2.CHECK FOR POOR CONTACT.

Check the poor contact of ECM connector and the mass air flow and intake air temperature sensor connector.

Is there poor contact of ECM connector or the mass air flow and intake air temperature sensor connectors?

Repair the poor contact of ECM connector or the mass air flow and intake air temperature sensor connector.

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

1) Turn the ignition switch to OFF.

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

3) Measure the resistance of harness between ECM connector and the mass air flow and intake air temperature sensor connector.

Connector & terminal

(B134) No. 28 — (B3) No. 1:

(B134) No. 15 — (B3) No. 2:

Is the resistance less than 1 Ω?

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between ECM connector and the mass air flow and intake air temperature sensor connector

• Poor contact of coupling connector

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

1) Connect all connectors.

2) Turn the ignition switch to OFF.

3) Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B134) No. 28 (+) — Chassis ground (−):

Is the voltage 5 V or more?

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

Replace the mass air flow and intake air temperature sensor.