ENGINE (DIAGNOSTICS)(H4SO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0400 EXHAUST GAS RECIRCULATION FLOW

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

• Movement performance problem when engine is low speed.

• Improper idling

• Movement performance problem

CAUTION:

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

WIRING DIAGRAM:

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1.CHECK CURRENT DATA.

1) Start the engine.

2) Read data of intake manifold absolute pressure 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 measured value 53.3 kPa (400 mmHg, 15.75 inHg) or more?

Make sure that the EGR valve, manifold absolute pressure sensor and throttle body are installed securely.

2.CHECK EGR SOLENOID VALVE.

Remove the EGR valve.

Are there holes, plugged piping or foreign objects caught in the EGR system?

Repair the EGR system.

Replace the EGR valve.