Subaru IMPREZA GD 2007 Series Manual page 276

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
6 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector
on faulty cylinders.
3) Turn the ignition switch to ON.
4) Measure the voltage between the ECM and
chassis ground for faulty cylinders.
Connector & terminal
#1 (B137) No. 8 (+) — Chassis ground (–):
#2 (B137) No. 9 (+) — Chassis ground (–):
#3 (B137) No. 10 (+) — Chassis ground (–):
#4 (B137) No. 11 (+) — Chassis ground (–):
7 CHECK FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between fuel injec-
tor terminals on faulty cylinder.
Terminals
No. 1 — No. 2:
8 CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOR/CRANKSHAFT POSITION
SENSOR.
9 CHECK CRANK SPROCKET.
Remove the timing belt cover. <Ref. to
ME(H4SO)-42, REMOVAL, Timing Belt Cover.>
10 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft using ST, and align align-
ment mark on crank sprocket with alignment
mark on cylinder block.
ST 499987500
11 CHECK FUEL LEVEL.
Is the voltage 10 V or more?
Is the resistance less than 1 Ω? Replace the faulty
Is the camshaft position sensor
or crankshaft position sensor
loosely installed?
Is the crank sprocket rusted or
does it have damaged teeth?
Is the timing belt dislocated
from its proper position?
CRANKSHAFT
SOCKET
Is the fuel meter indication
higher than the "Lower" level?
EN(H4SO)(diag)-167
ENGINE (DIAGNOSTICS)
Check Yes
Repair the short
circuit to power in
the harness
between the ECM
and fuel injector.
fuel injector. <Ref.
to FU(H4SO)-30,
Fuel Injector.>
Tighten the cam-
shaft position sen-
sor or crankshaft
position sensor.
<Ref. to
FU(H4SO)-24,
Camshaft Position
Sensor.> <Ref. to
FU(H4SO)-23,
Crankshaft Posi-
tion Sensor.>
Replace the crank
sprocket. <Ref. to
ME(H4SO)-50,
Crank Sprocket.>
Repair the installa-
tion condition of
timing belt. <Ref. to
ME(H4SO)-43,
Timing Belt.>
Go to step 12.
No
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
Go to step 11.
Replenish fuel so
that fuel meter indi-
cation is higher
than the "Lower"
level. After replen-
ishing fuel, Go to
step 12.