Subaru 2006 Legacy, Manual

Page: 1664 / 4302

EN(H4DOTC)(diag)-162
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
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 (–):
Is the voltage more than 10 V? Repair the poor
contact of all con-
nectors in fuel
injector circuit.
Repair the har-
ness and connec-
tor.
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
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 (B136) No. 6 (+) — Chassis ground (–):
#2 (B136) No. 5 (+) — Chassis ground (–):
#3 (B136) No. 4 (+) — Chassis ground (–):
#4 (B136) No. 3 (+) — Chassis ground (–):
Is the voltage more than 10 V? Repair the battery
short circuit of har-
ness between
ECM and fuel
injector. After
repair, replace the
ECM. <Ref. to
FU(H4DOTC)-38,
Engine Control
Module (ECM).>
Go to step
8
.
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:
Is the resistance between 5 —
20
Ω
?
Go to step
9
. Replace the faulty
fuel injector and
ECM. <Ref. to
FU(H4DOTC)-28,
Fuel Injector.>
<Ref. to
FU(H4DOTC)-38,
Engine Control
Module (ECM).>
9 CHECK INSTALLATION OF CAMSHAFT PO-
SITION SENSOR/CRANKSHAFT POSITION
SENSOR.
Is the camshaft position sensor
or crankshaft position sensor
loosely installed? Tighten the cam-
shaft position sen-
sor or crankshaft
position sensor. Go to step
10
.
10 CHECK CRANKSHAFT SPROCKET.
Remove the timing belt cover.
Is the crank sprocket rusted or
does it have broken teeth? Replace the crank-
shaft sprocket.
<Ref. to
ME(H4DOTC)-51,
Crank Sprocket.> Go to step 11 .
11 CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft, and align alignment mark
on crank sprocket with alignment mark on cyl-
inder block.
Is the timing belt dislocated
from its proper position? Repair the installa-
tion condition of
timing belt. <Ref.
to ME(H4DOTC)-
42, Timing Belt.> Go to step 12 .
Step Check Yes No
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