DTC P0400 EGR "A" Flow: Notes

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

1. CHECK CURRENT DATA. 
   1. Start the engine.
   2. Using the Subaru Select Monitor or a general scan tool, read the value of [Mani. Absolute Pressure].
      NOTE:

      • Subaru Select Monitor

        For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor .

      • General scan tool

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

   Is the value of [Mani. Absolute Pressure] 53.3 kPa (400 mmHg, 15.75 inHg) or more?

   • Yes: Make sure that the EGR control valve, manifold absolute pressure sensor and throttle body are installed securely.
   • No: Go to  2.
2. CHECK EGR CONTROL VALVE. 

   Remove the EGR control valve.

   Are there any holes, clogged lines or foreign matters in the EGR system?

   • Yes: Repair the EGR system.
   • No: Replace EGR control valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>EGR Control Valve .