Subaru IMPREZA GD 2007 Series Manual page 392

asieps_tobira_IM_US.book 283 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7 CHECK OUTPUT SIGNAL FOR ECM.
Measure the voltage between front oxygen (A/
F) sensor connector and chassis ground.
Connector & terminal
(E118) No. 1 (+) — Chassis ground (–):
(E118) No. 3 (+) — Chassis ground (–):
8 CHECK EXHAUST SYSTEM.
9 CHECK AIR INTAKE SYSTEM.
10 CHECK FUEL PRESSURE.
WARNING:
Place "NO OPEN FLAMES" signs near the
working area.
CAUTION:
Be careful not to spill fuel.
1) Connect the front oxygen (A/F) sensor con-
nector.
2) Measure the fuel pressure. <Ref. to
ME(H4SO)-28, INSPECTION, Fuel Pressure.>
CAUTION:
Release fuel pressure before removing the
fuel pressure gauge.
11 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)-32, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Check
Is the voltage 8 V or more?
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
49 — 52 psi)?
Is the engine coolant tempera-
ture 75°C (167°F) or higher?
EN(H4SO)(diag)-283
ENGINE (DIAGNOSTICS)
Yes No
Repair the short Repair poor con-
circuit to power in tact of the ECM
the harness connector.
between the ECM
and front oxygen
(A/F) sensor con-
nector. After repair,
replace the ECM.
<Ref. to
FU(H4SO)-39,
Engine Control
Module (ECM).>
Repair the exhaust Go to step 9.
system.
Repair the air Go to step 10.
intake system.
Go to step 11.
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 12. Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO)-22,
Engine Coolant
Temperature Sen-
sor.>