Subaru Legacy III (2000-2003 year). Service manual — part 380
EN(H6DO)-322
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
CO:DTC P1560 — BACK-UP VOLTAGE CIRCUIT MALFUNCTION —
• DTC DETECTING CONDITION:
• Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
EN-01083
D10
A14
D2
A2
D3
E49
B252
D9
C8
D8
D31
D21
5
1
3
B47
BATTERY
MAIN RELAY
1
2
3
5
6
4
F44
B61
SBF-5
6
F46
B108
2
SBF-4
SBF-1
4
1
B72
IGNITION
SWITCH
ECM
B134
A:
B136
C:
B137
D:
A22
7
B137
B136
C:
D:
A: B134
B47
3
4
1
2
5
6
B72
F44
F46
3 4
1 2
B252
C18
C17
TO FRONT OXYGEN (A/F) SENSOR
6
1 2 3 4
5 6 7 8
3 4
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
10 11 12
19 20 21
13
5
6
14 15
7
8 9
16 17
18
22
1 2 3 4
5 6 7 8
LHD
RHD
RHD
RHD
RHD
LHD
LHD
LHD
EN(H6DO)-323
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to OFF.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 10 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair poor con-
tact in ECM con-
nector.
2
CHECK HARNESS BETWEEN ECM AND
MAIN FUSE BOX CONNECTOR.
1) Disconnect connector from ECM.
2) Measure resistance of harness between
ECM and chassis ground.
Connector & terminal
(B137) No. 10 — Chassis ground:
Is the measured value less than the speci-
fied value?
10
Ω
Repair ground
short circuit in har-
ness between
ECM connector
and battery termi-
nal.
3
CHECK FUSE SBF-5.
Is fuse blown?
Fuse blown out.
Replace fuse.
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and battery
• Poor contact in
ECM connector
• Poor contact in
battery terminal
EN(H6DO)-324
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
CP:DTC P1698 — ENGINE TORQUE CONTROL CUT SIGNAL CIRCUIT MAL-
FUNCTION (LOW INPUT) —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
EN-01100
TCM
14
10
B136
B55
B55
B136
ECM
1 2 3 4
10 11 12
19 20 21
13
5 6
14 15
7
8
9
16
17
18
22
23
24
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
EN(H6DO)-325
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK OUTPUT SIGNAL FROM ECM.
1) Start engine, and warm-up the engine.
2) Turn ignition switch to OFF.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 14 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
3 V
Repair poor con-
tact in ECM con-
nector.
2
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and
TCM.
3) Measure resistance of harness between
ECM and chassis ground.
Connector & terminal
(B136) No. 14 — Chassis ground:
Is the measured value less than the speci-
fied value?
10
Ω
Repair ground
short circuit in har-
ness between
ECM and TCM
connector.
3
CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure resistance of harness between ECM
and TCM connector.
Connector & terminal
(B136) No. 14 — (B55) No. 10:
Is the measured value less than the specified
value?
1
Ω
Repair poor con-
tact in ECM or
TCM connector.
Repair open circuit
in harness
between ECM and
TCM connector.
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