Subaru Legacy III (2000-2003 year). Service manual — part 122
EN(H4SO)-100
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
6
CHECK POWER SUPPLY TO REAR OXY-
GEN SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from rear oxygen
sensor.
3) Turn ignition switch to ON.
4) Measure voltage between rear oxygen sen-
sor connector and engine ground or chas-
sis ground.
Connector & terminal
(T6) No. 2 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair power sup-
ply line.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
main relay and
rear oxygen sen-
sor connector
• Poor contact in
rear oxygen sen-
sor connector
• Poor contact in
coupling connector
7
CHECK REAR OXYGEN SENSOR.
1) Turn ignition switch to OFF.
2) Measure resistance between rear oxygen
sensor connector terminals.
Terminals
No. 1 — No. 2:
Is the measured value less than the speci-
fied value?
30
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
rear oxygen sen-
sor and ECM con-
nector
• Poor contact in
rear oxygen sen-
sor connector
• Poor contact in
ECM connector
• Poor contact in
coupling connector
Replace rear oxy-
gen sensor. <Ref.
to FU(H4SO)-43,
Rear Oxygen Sen-
sor.>
Step
Value
Yes
No
EN(H4SO)-101
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H4SO)-102
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
E: DTC P0038 — HO2S HEATER CONTROL CIRCUIT HIGH (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(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01122
BATTERY
F44
B61
6
T5
B19
2
B47
MAIN RELAY
1
2
3
5
4
6
F44
1 2 3 4
5 6 7 8
C4
B14
B19
D15
C16
C5
REAR
OXYGEN SENSOR
ECM
4
1
3
1
4
3
2
8
B22
B83
B19
T5
T6
E3
B47
B19
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
3
4
5
6
1
2
T6
4 3
2 1
2
1
FG
3
B135
B:
C: B136
D: B137
SBF-5
B136
5 6
7
2
1
9
8
4
3
23
21 22
24
10 11 12 13 14
25 26
15 16 17
18 19 20
B137
4
1
5
3
2
6
18
15
16
7 8 9 10 11
17
19 20
12 13
14
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
B135
B83
1 2 3 4 5 6
4
EG
: FOR G.C.C COUNTRIES MODEL
: EXCEPT FOR G.C.C COUNTRIES MODEL
FG
EG
EN(H4SO)-103
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK INPUT SIGNAL FOR ECM.
Measure voltage between ECM connector and
chassis ground.
Connector & terminal
(B136) No. 4 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the specified
value?
8 V
2
CHECK CURRENT DATA.
1) Turn ignition switch to OFF.
2) Repair battery short circuit in harness
between ECM and rear oxygen sensor con-
nector.
3) Turn ignition switch to ON.
4) Read data of rear oxygen 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(H4SO)-32, Subaru Select Moni-
tor.>
•OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-II General Scan Tool Instruction Manual.
7 A
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
END
3
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
END
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст