Subaru 2004 LEGACY Service Manual page 111

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 (
#5 (E43) No. 2 (+) — Engine ground (
#6 (E44) 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 cylinder.
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 (
#5 (B136) No. 2 (+) — Chassis ground (
#6 (B136) No. 1 (+) — 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 PLATE.
11 CHECK INSTALLATION CONDITION OF
TIMING CHAIN.
Turn the crankshaft using ST, and align align-
ment mark on crank sprocket with alignment
mark on cylinder block.
ST 18252AA000
Is the voltage more than 10 V? Repair the poor
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Is the voltage more than 10 V? Repair the battery
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Is the resistance less than 1
Ω?
Is the camshaft position sensor
or crankshaft position sensor
loosely installed?
Is the crank sprocket rusted or
the teeth of crank plate bro-
ken?
Is the timing chain dislocated
from its proper position?
CRANKSHAFT SOCKET
EN(H6DO)(diag)-180
Check
contact in all con-
nectors in fuel
injector circuit.
short circuit in har-
ness between
ECM and fuel
injector. After
repair, replace the
ECM. <Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>
Replace the faulty
fuel injector and
ECM. <Ref. to
FU(H6DO)-26,
Fuel Injector.>
<Ref. to
FU(H6DO)-34,
Engine Control
Module (ECM).>
Tighten camshaft
position sensor or
crankshaft posi-
tion sensor.
Replace the crank
plate. <Ref. to
ME(H6DO)-63,
Cylinder Block.>
Repair installation
condition of timing
chain. <Ref. to
ME(H6DO)-45,
Timing Chain
Assembly.>
Yes No
Repair the har-
ness and connec-
tor.
NOTE:
In this case repair
the following:
• Open circuit in
harness between
main relay and fuel
injector on faulty
cylinders
• Poor contact in
coupling connector
• Poor contact in
main relay connec-
tor
• Poor contact in
fuel injector con-
nector on faulty
cylinders
Go to step 8.
Go to step 9.
Go to step 10.
Go to step 11.
Go to step 12.