Subaru LEGACY 2006 Manual page 213

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
6 CHECK POWER SUPPLY LINE.
1) Turn the ignition switch to ON.
2) Measure the voltage between fuel injector
and engine ground on faulty cylinders.
Connector & terminal
#1 (E5) No. 2 (+) — Engine ground (–):
#2 (E16) No. 2 (+) — Engine ground (–):
#3 (E6) No. 2 (+) — Engine ground (–):
#4 (E17) No. 2 (+) — Engine ground (–):
7 CHECK HARNESS BETWEEN FUEL INJEC-
TOR AND ECM CONNECTOR.
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 ECM con-
nector and chassis ground on 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 (–):
8 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:
9 CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOR/CRANKSHAFT POSITION
SENSOR.
10 CHECK CRANK SPROCKET.
Remove the timing belt cover.
11 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cyl-
inder block.
12 CHECK FUEL LEVEL.
Check
Is the voltage more than 10 V? Repair the poor
Is the voltage more than 10 V? Repair the battery
Is the resistance less than 1
Ω?
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?
Is the fuel meter indication
higher than the "Lower" level?
EN(H4SO)(diag)-176
Yes No
Repair the har-
contact of all con- ness and connec-
nectors in fuel tor.
injector circuit.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
main relay and fuel
injector connector
on faulty cylinders
• Poor contact of
coupling connector
• Poor contact of
main relay connec-
tor
• Poor contact of
fuel injector con-
nector on faulty
cylinders
Go to step 8.
short circuit of har-
ness between
ECM and fuel
injector. After
repair, replace the
ECM. <Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>
Replace the faulty Go to step 9.
fuel injector <Ref.
to FU(H4SO)-27,
Fuel Injector.> and
ECM. <Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>
Tighten the cam- Go to step 10.
shaft position sen-
sor or crankshaft
position sensor.
Replace the crank Go to step 11.
sprocket. <Ref. to
ME(H4SO)-46,
Crank Sprocket.>
Repair the installa- Go to step 12.
tion condition of
timing belt. <Ref.
to ME(H4SO)-40,
Timing Belt.>
Go to step 13.
Refill the fuel so
that fuel meter
indication is higher
than the "Lower"
level. After filling
fuel, Go to step 13.