Subaru LEGACY 2006 Manual page 312

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (–):
8 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (–):
9 CHECK EXHAUST SYSTEM.
10 CHECK AIR INTAKE SYSTEM.
11 CHECK FUEL PRESSURE.
WARNING:
• Place "NO FIRE" signs near the working
area.
• Be careful not to spill fuel.
Measure the fuel pressure. <Ref. to
ME(H4SO)-25, INSPECTION, Fuel Pressure.>
WARNING:
Release fuel pressure before removing the
fuel pressure gauge.
12 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 procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-26, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Check
Is the voltage more than 4.95
V?
Is the voltage more than 10 V? Repair the battery
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 kgf/cm
47 — 52 psi)?
Is the temperature above 60°C
(140°F)?
EN(H4SO)(diag)-275
ENGINE (DIAGNOSTICS)
Yes No
Go to step 8. Go to step 9.
Repair the poor
short circuit of har- contact of ECM
ness between connector.
ECM and front
oxygen (A/F) sen-
sor connector.
After repair,
replace the ECM.
<Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 10.
Repair the exhaust
system.
Repair the air Go to step 11.
intake system.
Go to step 12. Repair the follow-
ing item.
2
,
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 13. Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO)-19,
Engine Coolant
Temperature Sen-
sor.>