Subaru Legacy III (2000-2003 year). Service manual — part 326
EN(H6DO)-106
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B137) No. 4 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
8 V
2
CHECK OUTPUT SIGNAL FROM ECM.
Measure voltage between ECM connector and
chassis ground.
Connector & terminal
(B137) No. 5 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the specified
value?
8 V
3
CHECK FRONT OXYGEN (A/F) SENSOR
HEATER CURRENT.
1) Turn ignition switch to OFF.
2) Repair battery short circuit in harness
between ECM and front oxygen (A/F) sen-
sor connector.
3) Turn ignition switch to ON.
4) Read data of front oxygen (A/F) sensor
heater current using Subaru Select Monitor
or the OBD-II general scan tool.
Does the measured value exceed the spec-
ified value?
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H6DO)-34, Subaru Select Moni-
tor.>
• OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-II General Scan Tool Instruction Manual.
2.3 A
Replace ECM.
<Ref. to
FU(H6DO)-46,
Engine Control
Module.>
END
4
CHECK OUTPUT SIGNAL FROM ECM.
Measure voltage between ECM connector and
chassis ground.
Connector & terminal
(B137) No. 4 (+) — Chassis ground (
−−−−
):
Does the voltage change more than the speci-
fied value by shaking harness and connector
of ECM while monitoring the value with voltage
meter?
8 V
Repair battery
short circuit in har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
5
CHECK OUTPUT SIGNAL FROM ECM.
Measure voltage between ECM connector and
chassis ground.
Connector & terminal
(B137) No. 5 (+) — Chassis ground (
−−−−
):
Does the voltage change more than the speci-
fied value by shaking harness and connector
of ECM while monitoring the value with voltage
meter?
8 V
Repair battery
short circuit in har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
END
EN(H6DO)-107
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H6DO)-108
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
D: DTC P0037 — HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)
—
• 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-01088
BATTERY
F44
B61
6
T5
B19
B47
MAIN RELAY
2
1
3
5
4
6
F44
1 2 3 4
5 6 7 8
C13
B17
B19
B26
D21
D31
D9
D8
REAR
OXYGEN
SENSOR
5
3
6
4
1
3
4
2
1
5
B252
B83
B19
T5
T6
E49
B47
T6
B136
C:
D:
B135
B:
3
4
5
6
1
2
5
7
ECM
B135
B:
B136
C:
B137
D:
3
4
1
2
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
5 6
7 8
2
1
9
4
3
10
24
22
23
25
11 12 13 14 15
26 27 28
16 17 18 19
20 21
B137
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
RHD
LHD
LHD
RHD
B252
1 2 3 4
5 6 7 8
B19
4
1 2 3
6
5
2
B83
1 2 3 4
5 6 7 8 9 10
11 12
19
20
13 14 15 16 17 18
EN(H6DO)-109
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK GROUND CIRCUIT OF ECM.
1) Turn ignition switch to OFF.
2) Disconnect ECM connector.
3) Measure resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B137) No. 31 — Chassis ground:
(B137) No. 21 — Chassis ground:
(B137) No. 8 — Chassis ground:
(B137) No. 9 — Chassis ground:
Is the measured value less than the speci-
fied value?
5
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and engine
ground terminal
• Poor contact in
ECM connector
• Poor contact in
coupling connector
2
CHECK CURRENT DATA.
1) Start engine.
2) Read data of rear oxygen sensor heater
current using Subaru Select Monitor or
OBD-II general scan tool.
Does the measured value exceed the spec-
ified value?
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H6DO)-34, Subaru Select Moni-
tor.>
• OBD-II scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
0.2 A
Repair connector.
NOTE:
In this case, repair
the following:
• Poor contact in
rear oxygen sen-
sor connector
• Poor contact in
rear oxygen sen-
sor connecting
harness connector
• Poor contact in
ECM connector
3
CHECK OUTPUT SIGNAL FROM ECM.
1) Start and idle the engine.
2) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 13 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
1.0 V
4
CHECK OUTPUT SIGNAL FROM ECM.
Measure voltage between ECM connector and
chassis ground.
Connector & terminal
(B136) No. 13 (+) — Chassis ground (
−−−−
):
Does the voltage change less than the speci-
fied value by shaking harness and connector
of ECM while monitoring the value with voltage
meter?
1.0 V
Repair poor con-
tact in ECM con-
nector.
5
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from rear oxygen
sensor.
3) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 13 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
1.0 V
Contact SUARU
distributor service.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
Repair battery
short circuit in har-
ness between
ECM and rear oxy-
gen sensor con-
nector. After
repair, replace
ECM. <Ref. to
FU(H6DO)-46,
Engine Control
Module.>
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