Subaru Legacy IV (2008 year). Service manual — part 1182
LAN(diag)-62
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
3
CHECK DTC.
Turn the ignition switch to OFF and read DTCs
again.
Is the DTC displayed a current
malfunction?
Go to step 5.
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 HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280).
2) Measure the resistance between harness
connectors.
Connector & terminal
(B280) No. 20 — No. 30:
Is the resistance 55 — 65
:?
(Specification 60
:)
Go to step 8.
Go to step 6.
6
CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280).
2) Measure the resistance between harness
connectors.
Connector & terminal
(B280) No. 20 — No. 30:
Is the resistance 115 — 125
:?
(End resistance or main wiring
harness is open.)
Go to step 7.
If the resistance is
1 M
: or larger, a
line related to the
body integrated
unit is open. Repair
the open circuit of
harness or replace
harness.
7
CHECK ECM.
Read the DTC of ECM using the Subaru Select
Monitor. <Ref. to EN(H6DO)(diag)-43, SUB-
ARU SELECT MONITOR (NORMAL MODE),
OPERATION, Read Diagnostic Trouble Code
(DTC).>
Are there any DTCs other than
one for “CAN communication”?
Perform the diag-
nosis according to
DTC. <Ref. to
EN(H6DO)(diag)-
43, SUBARU
SELECT MONI-
TOR (NORMAL
MODE), OPERA-
TION, Read Diag-
nostic Trouble
Code (DTC).>
Go to step 8.
8
CHECK BODY INTEGRATED UNIT.
1) Connect all the control module connectors.
2) Check the data of “body integrated unit data
received” on the current data display of ECM
using Subaru Select Monitor.
Is the “ON” displayed?
Go to step 9.
Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>
9
CHECK BODY INTEGRATED UNIT.
Check the data of “body integrated unit counter
update” on the data display of ECM.
Is the “ON” displayed?
Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>
Inspect the ECM.
<Ref. to
FU(H4SO)-39,
REMOVAL, Engine
Control Module
(ECM).> <Ref. to
FU(H4DOTC)-52,
REMOVAL, Engine
Control Module
(ECM).> <Ref. to
FU(H6DO)-38,
REMOVAL, Engine
Control Module
(ECM).>
Step
Check
Yes
No
LAN(diag)-63
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
N: DTC U1222 CAN-HS TCM NO-RECEIVE DATA
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:
• Malfunction indicator light illuminates.
• “Er HC” 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)-64
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 3.
3
CHECK DTC.
Turn the ignition switch to OFF and read DTCs
again.
Is the DTC displayed a current
malfunction?
Go to step 5.
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 HARNESS.
1) Disconnect the TCM connector (B54 or
B55).
2) Measure the resistance between harness
connector terminals.
Connector & terminal
4AT model:
(B54) No. 17 — No. 18:
5AT model:
(B55) No. 20 — No. 21:
Is the resistance 1 M
: or
more?
Open circuit in
related lines of
TCM. Repair the
open circuit of har-
ness or replace
harness.
Go to step 6.
6
CHECK TCM.
Read the DTC of the TCM using Subaru Select
Monitor. <Ref. to 5AT(diag)-18, OPERATION,
Subaru Select Monitor.>
Is DTC other than “CAN com-
munication” displayed?
Perform the diag-
nosis according to
DTC.
Go to step 7.
7
CHECK BODY INTEGRATED UNIT.
1) Connect all the control module connectors.
2) Check the data of “body integrated unit data
received” on the current data display of ECM
using Subaru Select Monitor.
Is the “ON” displayed?
Go to step 8.
Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>
8
CHECK BODY INTEGRATED UNIT.
Check the data of “body integrated unit counter
update” on the data display of ECM.
Is the “ON” displayed?
Replace the TCM.
<Ref. to 4AT-61,
REMOVAL, Trans-
mission Control
Module (TCM).>
<Ref. to 5AT-60,
REMOVAL, Trans-
mission Control
Module (TCM).>
Replace the body
integrated unit.
<Ref. to SL-56,
REMOVAL, Body
Integrated Unit.>
LAN(diag)-65
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
O: DTC U1223 CAN-HS VDC/ABS NO-RECEIVE DATA
DTC DETECTING CONDITION:
Defective VDC/ABSCM. (If error is in the main harness, DTC P0600 High-speed CAN circuit is input at the
same time.
TROUBLE SYMPTOM:
• ABS warning light and VDC warning light come on.
• “Er HC” 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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