Subaru 2009 IMPREZA Service Manual page 686

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?
2 CHECK ENGINE OIL.
3 CHECK EXHAUST SYSTEM.
4 CHECK AIR INTAKE SYSTEM.
5 CHECK FUEL PRESSURE.
WARNING:
Place "NO OPEN FLAMES" signs near the
working area.
CAUTION:
Be careful not to spill fuel.
Measure the fuel pressure. <Ref. to ME(H4SO)-
27, INSPECTION, Fuel Pressure.>
CAUTION:
Release fuel pressure before removing the
fuel pressure gauge.
6 CHECK ENGINE COOLANT TEMPERATURE
SENSOR.
1) Start the engine and warm up completely.
2) Read the data of engine coolant tempera-
ture 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". <Ref.
to EN(H4SO)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
Check
Is there a proper amount of
engine oil?
Are there holes or loose bolts
on exhaust system?
Are there holes, loose bolts or
disconnection of hose on air
intake system?
Is the measured value 339.5 —
360.5 kPa (3.5 — 3.7 kg/cm
49 — 52 psi)?
Is the engine coolant tempera-
ture 75°C (167°F) or higher?
EN(H4SO)(diag)-269
ENGINE (DIAGNOSTICS)
Yes
Check the appro- Go to step 2.
priate DTC using
the "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H4SO)(diag)-
86, List of Diagnos-
tic Trouble Code
(DTC).>
Go to step 3. Replace engine oil.
<Ref. to
LU(H4SO)-9,
REPLACEMENT,
Engine Oil.>
Repair the exhaust Go to step 4.
system.
Repair the air Go to step 5.
intake system.
Go to step 6. Repair the follow-
2
, ing item.
Fuel pressure is
too high:
• Clogged fuel line
or bent hose
Fuel pressure is
too low:
• Improper fuel
pump discharge
• Clogged fuel line
Go to step 7. Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO)-25,
Engine Coolant
Temperature Sen-
sor.>
No