Subaru 2009 IMPREZA Service Manual page 629

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK FUEL FILLER CAP.
1) Turn the ignition switch to OFF.
2) Open the fuel flap.
2 CHECK PRESSURE VACUUM LINE.
NOTE:
Check the following items.
• Disconnection, leakage and clogging of the
vacuum hoses and pipes between fuel tank
pressure sensor and fuel tank
• Disconnection, leakage and clogging of air
ventilation hoses and pipes between fuel filler
pipe and fuel tank
Check
Is the fuel filler cap tightened
securely?
Is there any fault in pressure/
vacuum line?
EN(H4SO)(diag)-212
Yes No
Go to step 2. Tighten fuel filler
cap securely.
Repair or replace Replace the fuel
the hoses and tank pressure sen-
pipes. sor. <Ref. to
EC(H4SO)-15,
Fuel Tank Pres-
sure Sensor.>