Subaru Legacy (2005 year). Service 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
EN(H4SO 2.5)(diag)-146
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
13
CHECK FUEL LEVEL.
Is the fuel gauge indication
higher than the “Lower” level?
Replenish fuel so
fuel gauge indica-
tion is higher than
the “Lower” level.
After replenishing
fuel, Go to step 14.
14
CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Perform the clear memory mode using
Subaru Select Monitor.
<Ref. to EN(H4SO 2.5)(diag)-40, Clear Mem-
ory Mode.>
2) Start the engine, and drive the vehicle more
than 10 minutes.
Does the malfunction indicator
light illuminate or blink?
15
CHECK CAUSE OF MISFIRE DIAGNOSED.
Has the cause of misfire been
detected while running the
engine? EX. Disconnection of
spark plug cord.
Finish diagnostics
operation, if the
engine has no
abnormality.
Repair the poor
contact.
NOTE:
In this case, repair
the following:
• Poor contact in
ignition coil con-
nector
• Poor contact in
fuel injector con-
nector on faulty
cylinders
• Poor contact in
ECM connector
• Poor contact in
coupling connector
16
CHECK AIR INTAKE SYSTEM.
Is there any fault in air intake
system?
Repair the air
intake system.
NOTE:
Check the follow-
ing items.
• Are there air
leaks or air suction
caused by loose or
dislocated nuts
and bolts?
• Are there cracks
or any disconnec-
tion of hoses?
17
CHECK MISFIRE SYMPTOM.
1) Turn the ignition switch to ON.
2) Read the DTC.
• Subaru Select Monitor
<Ref. to EN(H4SO 2.5)(diag)-25, Subaru
Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
NOTE:
Perform diagnosis according to the items listed
below.
Does the Subaru Select Moni-
tor or general scan tool display
only one DTC?
18
CHECK ANY OTHER DTC ON DISPLAY.
Are DTC P0301 and P0302
displayed?
19
CHECK DTC ON DISPLAY.
Are DTC P0303 and P0304
displayed?
Step
Check
Yes
No
EN(H4SO 2.5)(diag)-147
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
20
CHECK DTC ON DISPLAY.
Are DTC P0301 and P0303
displayed?
21
CHECK DTC ON DISPLAY.
Are DTC P0302 and P0304
displayed?
22
ONLY ONE CYLINDER
Is there any fault in the cylin-
der?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Spark plug cord
• Fuel injector
• Compression
ratio
Go to DTC P0171.
<Ref. to EN(H4SO
2.5)(diag)-134,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
23
GROUP OF #1 AND #2 CYLINDERS
Are there any faults in #1 and
#2 cylinders?
Repair or replace
faulty parts.
NOTE:
(1) Check the fol-
lowing items.
• Spark plug
• Fuel injector
• Ignition coil
• Compres-
sion ratio
(2) If no abnormal
is discovered,
check for “IGNI-
TION CONTROL
SYSTEM” of #1
and #2 cylinders
side. <Ref. to
EN(H4SO
2.5)(diag)-60,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Failure.>
Go to DTC P0171.
<Ref. to EN(H4SO
2.5)(diag)-134,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
24
GROUP OF #3 AND #4 CYLINDERS
Are there any faults in #3 and
#4 cylinders?
Repair or replace
faulty parts.
NOTE:
(1) Check the fol-
lowing items.
• Spark plug
• Fuel injector
• Ignition coil
(2) If no abnormal
is discovered,
check for “16. D:
IGNITION CON-
TROL SYSTEM”
of #3 and #4 cylin-
ders side. <Ref. to
EN(H4SO
2.5)(diag)-60,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Failure.>
Go to DTC P0171.
<Ref. to EN(H4SO
2.5)(diag)-134,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Step
Check
Yes
No
EN(H4SO 2.5)(diag)-148
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
25
GROUP OF #1 AND #3 CYLINDERS
Are there any faults in #1 and
#3 cylinders?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Skipping timing
belt teeth
Go to DTC P0171.
<Ref. to EN(H4SO
2.5)(diag)-134,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
26
GROUP OF #2 AND #4 CYLINDERS
Are there any faults in #2 and
#4 cylinders?
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression
ratio
• Skipping timing
belt teeth
Go to DTC P0171.
<Ref. to EN(H4SO
2.5)(diag)-134,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
27
CYLINDER AT RANDOM
Is the engine idle rough?
Go to DTC P0171.
<Ref. to EN(H4SO
2.5)(diag)-134,
DTC P0171 SYS-
TEM TOO LEAN
(BANK 1), Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>
Repair or replace
faulty parts.
NOTE:
Check the follow-
ing items.
• Spark plug
• Fuel injector
• Compression
ratio
Step
Check
Yes
No
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст