Subaru Legacy (2005 year). Manual - part 215
EN(H4SO 2.5)(diag)-145
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7
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 in all con-
nectors in fuel
injector circuit.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
main relay and fuel
injector connector
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
8
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(H4SO 2.5)-37,
Engine Control
Module (ECM).>
9
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 less than 1
Ω?
Replace the faulty
fuel injector and
ECM. <Ref. to
FU(H4SO 2.5)-32,
Fuel Injector.>
<Ref. to FU(H4SO
2.5)-37, Engine
Control Module
(ECM).>
10
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.
11
CHECK CRANK SPROCKET.
Remove the timing belt cover.
Is the crank sprocket rusted or
does it have broken teeth?
Replace the crank
sprocket. <Ref. to
ME(H4SO 2.0)-50,
Crank Sprocket.>
12
CHECK INSTALLATION CONDITION OF
TIMING BELT.
Turn the crankshaft to align the alignment mark
on crank sprocket with the alignment mark on
cylinder block.
Is the timing belt dislocated
from its proper position?
Correct the instal-
lation condition of
timing belt. <Ref.
to ME(H4SO 2.0)-
43, Timing Belt.>
Step
Check
Yes
No