Subaru Legacy IV (2008 year). Service manual — part 1180
LAN(diag)-54
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
17
CHECK DTC.
Connect the Subaru Select Monitor and read
the Diagnostic Trouble Code (DTC) of ECM.
<Ref. to EN(H6DO)(diag)-43, OPERATION,
Read Diagnostic Trouble Code (DTC).>
Is DTC other than “CAN com-
munication” displayed?
Perform the diag-
nosis according to
DTC.
Go to step 18.
18
CHECK DTC.
Connect the Subaru Select Monitor and read
the Diagnostic Trouble Code (DTC) of VDC/
ABS CM. <Ref. to VDC(diag)-14, HOW TO USE
SUBARU SELECT MONITOR, OPERATION,
Subaru Select Monitor.>
Is DTC other than “CAN com-
munication” or “C0057” dis-
played?
Perform the diag-
nosis according to
DTC.
Go to step 19.
19
CHECK DTC.
Connect the Subaru Select Monitor and read
the Diagnostic Trouble Code (DTC) of TCM.
<Ref. to 5AT(diag)-18, READ DIAGNOSTIC
TROUBLE CODE (DTC), OPERATION, Subaru
Select Monitor.>
Is DTC other than “CAN com-
munication” displayed?
Perform the diag-
nosis according to
DTC.
Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>
Step
Check
Yes
No
LAN(diag)-55
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
J: DTC U1211 CAN-HS ECM DATA ABNORMAL
DTC DETECTING CONDITION:
Defective data from ECM.
TROUBLE SYMPTOM:
“Er HC” or “Er EG” is displayed in odo/trip meter. (Except for meter with MID)
WIRING DIAGRAM:
LAN00382
B40
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
B280
B:
5
4
6 7
8
2
1
9
3
10
22
23
11 12 13 14 15
24 25
26 27
16 17 18
28 29
19 20
21
30
B231
1 2 3 4
A: B54
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B310
4 5 6 7 8 9
26 27 28 29 30
2 3
1
31 32 33 34 35 36
10 11
14 15 16 17 18 19
37 38 39 40
12 13
41 42 43 44 45 46
20 21
23
24
22
25
B230
1
2
3
4
B170
3 4
5 6
1 2
7 8
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
B365
B301
4 5 6 7 8 9
16 17 18 19 20
2 3
1
21 22 23 24 25 26
10 11
13
14
12
15
C: B136
B:
B55
5
6
7
2
1
3
4
29
10 11 12 13 14 15
25
24
16
30
9
8
17 18 19
20
28
21 22 23
32
31
26 27
33
34 35
2
3
B230
YAW RATE
SENSOR
B231
2
1
STEERING
ANGLE
SENSOR
VDCCM & H/U
B310
35
10
ECM
B136
27
35
B30
B20
BODY
INTEGRATED UNIT
B280
B:
6
14
B170
B365
B40
CAN JOINT
CONNEC-
TOR
CAN JOINT
CONNECTOR
DATA LINK
CONNECTOR
2
*
1
*
2
*
1
*
3
*
4
*
2
*
1
*
2
*
1
*
2
*
1
*
2
*
1
*
3
*
4
*
3
*
4
*
VDC
VDC
VDC
VDC
ABS
ABS
ABS
ABS
ABSCM & H/U
B301
26
11
VDC
ABS
ABS
TCM
B54
A:
4AT MODEL
5AT MODEL
B21
B20
A18
A17
B55
B:
VDC
*
1
*
2
*
3
*
4
: WITHOUT VDC
ABS
VDC
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 3, 11, 12 AND 13
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 8, 9, 10, 18, 19 AND 20
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 5 AND 6
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 3, 4, 7 AND 8
: WITH VDC
LAN(diag)-56
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK DTC.
Connect the Subaru Select Monitor and read all
DTCs.
Is there any DTC other than for
the body integrated unit?
Perform the diag-
nosis according to
the DTC of other
control modules.
Go to step 2.
2
CHECK DTC.
Check the DTC displayed in the body integrated
unit.
Is the DTC displayed a current
malfunction?
Check the connec-
tion of harness
connectors. Go to
step 3.
Go to step 4.
3
CHECK DTC.
Turn the ignition switch to OFF and read DTCs
again.
Is the DTC displayed a current
malfunction?
Replace the ECM.
<Ref. to
FU(H4DOTC)-52,
REMOVAL, Engine
Control Module
(ECM).> <Ref. to
FU(H6DO)-38,
REMOVAL, Engine
Control Module
(ECM).> <Ref. to
FU(H4SO)-39,
REMOVAL, Engine
Control Module
(ECM).>
Go to step 4.
4
CHECK CURRENT DATA.
Using the Subaru Select Monitor, display
engine speed and vehicle speed signal from
ECM, TCM, VDC/ABS and body integrated unit
under the same conditions and compare data.
Do all data values match?
Temporary poor
contact occurs.
Perform the Clear
Memory operation.
Go to step 5.
5
CHECK ECM.
Read the DTC of ECM using the Subaru Select
Monitor. <Ref. to EN(H6DO)(diag)-43, OPERA-
TION, Read Diagnostic Trouble Code (DTC).>
Is DTC other than “CAN com-
munication” displayed?
Perform the diag-
nosis according to
DTC.
Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>
LAN(diag)-57
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
K: DTC U1212 CAN-HS TCM DATA ABNORMAL
DTC DETECTING CONDITION:
TCM has error, harness between the main harness splice and TCM is open or shorted, connectors are not
connected securely, or the terminal has poor crimping.
TROUBLE SYMPTOM:
• SPORT indicator light blinks.
• “Er HC” or “Er tC” is displayed in odo/trip meter. (Except for meter with MID)
WIRING DIAGRAM:
LAN00382
B40
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
B280
B:
5
4
6 7
8
2
1
9
3
10
22
23
11 12 13 14 15
24 25
26 27
16 17 18
28 29
19 20
21
30
B231
1 2 3 4
A: B54
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B310
4 5 6 7 8 9
26 27 28 29 30
2 3
1
31 32 33 34 35 36
10 11
14 15 16 17 18 19
37 38 39 40
12 13
41 42 43 44 45 46
20 21
23
24
22
25
B230
1
2
3
4
B170
3 4
5 6
1 2
7 8
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
B365
B301
4 5 6 7 8 9
16 17 18 19 20
2 3
1
21 22 23 24 25 26
10 11
13
14
12
15
C: B136
B:
B55
5
6
7
2
1
3
4
29
10 11 12 13 14 15
25
24
16
30
9
8
17 18 19
20
28
21 22 23
32
31
26 27
33
34 35
2
3
B230
YAW RATE
SENSOR
B231
2
1
STEERING
ANGLE
SENSOR
VDCCM & H/U
B310
35
10
ECM
B136
27
35
B30
B20
BODY
INTEGRATED UNIT
B280
B:
6
14
B170
B365
B40
CAN JOINT
CONNEC-
TOR
CAN JOINT
CONNECTOR
DATA LINK
CONNECTOR
2
*
1
*
2
*
1
*
3
*
4
*
2
*
1
*
2
*
1
*
2
*
1
*
2
*
1
*
3
*
4
*
3
*
4
*
VDC
VDC
VDC
VDC
ABS
ABS
ABS
ABS
ABSCM & H/U
B301
26
11
VDC
ABS
ABS
TCM
B54
A:
4AT MODEL
5AT MODEL
B21
B20
A18
A17
B55
B:
VDC
*
1
*
2
*
3
*
4
: WITHOUT VDC
ABS
VDC
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 3, 11, 12 AND 13
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 8, 9, 10, 18, 19 AND 20
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 2, 5 AND 6
: TERMINAL No. OPTIONAL ARRANGEMENT
AMONG 3, 4, 7 AND 8
: WITH VDC
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