Subaru Legacy III (2000-2003 year). Service manual — part 490
EN(H4DOSTC)-130
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
V: DTC P0261 — CYLINDER 1 INJECTOR CIRCUIT LOW —
NOTE:
For the diagnostic procedure, refer to DTC P0270. <Ref. to EN(H4DOSTC)-132, DTC P0270 — CYLINDER
4 INJECTOR CIRCUIT LOW —, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
W: DTC P0264 — CYLINDER 2 INJECTOR CIRCUIT LOW —
NOTE:
For the diagnostic procedure, refer to DTC P0270. <Ref. to EN(H4DOSTC)-132, DTC P0270 — CYLINDER
4 INJECTOR CIRCUIT LOW —, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
X: DTC P0267 — CYLINDER 3 INJECTOR CIRCUIT LOW —
NOTE:
For the diagnostic procedure, refer to DTC P0270. <Ref. to EN(H4DOSTC)-132, DTC P0270 — CYLINDER
4 INJECTOR CIRCUIT LOW —, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
EN(H4DOSTC)-131
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H4DOSTC)-132
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Y: DTC P0270 — CYLINDER 4 INJECTOR CIRCUIT LOW —
• TROUBLE SYMPTOM:
• Engine stalls.
• Erroneous idling
• Rough driving
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOSTC)-35,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-00940
BATTERY
FUEL INJECTORS
MAIN RELAY
E
#4
1
2
SBF-5
#3
1
2
#2
1
2
#1
1
2
1
9
10
11
12
1 2
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
6
4
5
3
2
1
B22
B22
B136
B137
E5
E5
E3
E6
E6
E16
E16
E17
B47
E17
C :
D :
D1
C6
C5
C4
B136
B137
ECM
B47
3
4
1
2
5
6
EN(H4DOSTC)-133
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK OPERATION OF EACH FUEL INJEC-
TOR.
While cranking the engine, check that each
fuel injector emits “operating” sound. Use a
sound scope or attach a screwdriver to injector
for this check.
Does the fuel injector operate?
Operates.
Check the fuel
pressure. <Ref. to
ME(H4DOSTC)-
26, FUEL PRES-
SURE, .>
2
CHECK POWER SUPPLY TO EACH FUEL
INJECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from #1 cylinder
fuel injector.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between
the fuel injector terminal and engine
ground.
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 (–):
Does the measured value exceed the spec-
ified value?
10 V
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact in
main relay con-
nector
• Poor contact in
coupling connector
• Poor contact in
fuel injector con-
nector
3
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and fuel injector connector.
Connector & terminal
(B137) No. 1 — (E5) No. 1:
(B136) No. 6 — (E16) No. 1:
(B136) No. 5 — (E6) No. 1:
(B136) No. 4 — (E6) No. 1:
Is the measured value less than the speci-
fied value?
1
Ω
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
the harness
between ECM and
fuel injector con-
nector
• Poor contact in
the coupling con-
nector
4
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B137) No. 1 — Chassis ground:
(B136) No. 6 — Chassis ground:
(B136) No. 5 — Chassis ground:
(B136) No. 4 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair the ground
short circuit in har-
ness between
ECM and fuel
injector connector.
5
CHECK EACH FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between each fuel
injector terminals.
Terminals
No. 1 — No. 2:
Is the measured value within the specified
value?
5 — 20
Ω
Replace the faulty
fuel injector.
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