ENGINE (DIAGNOSTICS)(H4DOTC DIESEL) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0098 INTAKE AIR TEMPERATURE SENSOR #2 CIRCUIT (HIGH)

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

DTC P0098 INTAKE AIR TEMPERATURE SENSOR #2 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:

STEP	CHECK	YES	NO
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 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 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 may be the cause.
2.CHECK POOR CONTACT. Check the poor contact of ECM connector and the manifold absolute pressure and intake air temperature sensor connector.	Is there poor contact of ECM connector or the manifold absolute pressure and intake air temperature sensor connectors?	Repair the poor contact of ECM connector or the manifold absolute pressure and intake air temperature sensor connector.
3.CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from ECM and the manifold absolute pressure and intake air temperature sensor. 3) Measure the resistance of harness between ECM connector and the manifold absolute pressure and intake air temperature sensor connector. Connector & terminal (B134) No. 77 — (E124) No. 4: (B135) No. 16 — (E124) No. 2:	Is the resistance less than 1 Ω?		Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit of harness between ECM connector and the manifold absolute pressure and intake air temperature sensor connector • Poor contact of coupling connector
4.CHECK HARNESS BETWEEN ECM AND MANIFOLD ABSOLUTE PRESSURE 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. 77 (+) — Chassis ground (−):	Is the voltage 5 V or more?	Repair the short circuit to power in harness between ECM connector and the manifold absolute pressure and intake air temperature sensor connector.	Replace the manifold absolute pressure and intake air temperature sensor.