Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 784
LAN(diag)-45
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
3
CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect all control module connectors
(B280, B310, B136, B230, B231, B380) that are
connected to high speed CAN communication
line.
3) Connect all the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
For models without
SI-DRIVE, Go to
step
For models with SI-
DRIVE, Go to step
4.
4
CHECK DCCD CM.
1) Turn the ignition switch to OFF.
2) Disconnect the DCCD CM connector
(B380).
3) Turn the ignition switch to ON.
4) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
5
CHECK STEERING ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the DCCD CM connector.
3) Disconnect the steering angle sensor con-
nector (B231).
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
6
CHECK YAW RATE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the steering angle sensor connec-
tor.
3) Disconnect the yaw rate sensor connector
(B230).
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
7
CHECK VDC/ABS CM.
1) Turn the ignition switch to OFF.
2) Connect the yaw rate sensor connector.
3) Disconnect the VDC/ABS CM connector
(B310).
4) Install the 120 Ω resistance to VDC/ABS
CM connector terminals.
Terminals
(B310) No. 10 — No. 35:
5) Using the tester, measure the resistance
between terminals of data link connector.
Terminals
(B40) No. 6 — No. 14:
Is the resistance 60 Ω?
8
CHECK DTC.
1) Turn the ignition switch to ON.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
9
CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1202 a current malfunc-
tion?
Step
Check
Yes
No
LAN(diag)-46
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
10
CHECK ECM.
1) Turn the ignition switch to OFF.
2) Connect the VDC/ABS CM.
3) Disconnect the ECM connector (B136).
4) Install the 120 Ω resistance to ECM connec-
tor.
Terminals
(B136) No. 17 — No. 28:
5) Using the tester, measure the resistance
between terminals of data link connector.
Connector & terminal
(B40) No. 6 — No. 14:
Is the resistance 60 Ω?
Repair or replace
the open circuit of
harness.
11
CHECK DTC.
1) Turn the ignition switch to ON.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
12
CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1202 a current malfunc-
tion?
13
CHECK DTC.
1) Turn the ignition switch to OFF.
2) Reconnect all the disconnected connectors.
3) Turn the ignition switch to ON.
4) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
Replace the body
integrated unit.
<Ref. to SL-48,
REMOVAL, Body
Integrated Unit.>
14
CHECK HARNESS.
1) Shake the instrument harness and bulk-
head harness, rear harness.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1201 a current malfunc-
tion?
Repair or replace
the harness.
15
CHECK CONNECTOR.
1) Disconnect the connector used for CAN cir-
cuit.
2) Check the connector terminal.
Is there poor contact of connec-
tor terminal?
Repair the connec-
tor terminal where
poor contact
exists, or replace
harness.
It is possible that
temporary poor
communication
occurs.
16
CHECK HARNESS.
Using the tester, check the open, short (power
supply-output short, GND-output short) in the
harness between data link connector and
DCCD CM terminals.
Connector & terminal
(B40) No. 14 — (B380) No. 18:
(B40) No. 6 — (B380) No. 2:
Is harness normal?
Repair or replace
the harness.
17
CHECK HARNESS.
Using the tester, check for open or short (power
supply-output short, GND-output short) in the
harness between terminals of data link connec-
tor and steering angle sensor.
Connector & terminal
(B40) No. 14 — (B231) No. 1:
(B40) No. 6 — (B231) No. 2:
Is harness normal?
Replace the steer-
ing angle sensor.
<Ref. to VDC-22,
REPLACEMENT,
Steering Angle
Sensor.>
Repair or replace
the harness.
Step
Check
Yes
No
LAN(diag)-47
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
18
CHECK HARNESS.
Using the tester, check for open or short (power
supply-output short, GND-output short) in the
harness between terminals of data link connec-
tor and yaw rate sensor.
Connector & terminal
(B40) No. 14 — (B230) No. 3:
(B40) No. 6 — (B230) No. 2:
Is harness normal?
Replace the yaw
rate sensor. <Ref.
to VDC-20,
REMOVAL, Yaw
Rate and G Sen-
sor.>
Repair or replace
the harness.
Step
Check
Yes
No
LAN(diag)-48
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
G: DTC U1202 CAN-HS BUS OFF
DTC DETECTING CONDITION:
Integrated unit communication is shut down because of high speed CAN error.
TROUBLE SYMPTOM:
Each warning light illuminates because the CAN communication (sending and receiving) is not normal.
WIRING DIAGRAM:
CAN communication system <Ref. to WI-171, WIRING DIAGRAM, CAN Communication System.>
Step
Check
Yes
No
1
Is any DTC other than for the
body integrated unit displayed?
Perform the diag-
nosis according to
displayed DTC.
2
CHECK DTC.
1) Turn the ignition switch to OFF → ON.
2) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is U1202 a current malfunc-
tion?
2
1
B231
1
8
2
B380
B3
B9
B280
B:
6
14
B40
B380
1 2 3 4
17 18 19 20
5 6 7 8
21 22 23 24
9 10 11 12
25 26 27 28
13 14 15 16
29 30 31 32
4 5 6 7 8 9
6
2
7
2
8
2
9
2
0
3
2 3
1
1
3
2
3
3
3
4
3
5
3
6
3
0
1
1
1
4
1
5
1
6
1
7
1
8
1
9
1
7
3
8
3
9
3
0
4
2
1
3
1
1
4
2
4
3
4
4
4
5
4
6
4
0
2
1
2
3
2
4
2
2
2
5
2
B310
B231
1 2 3 4
B230
1
2
3
4
C: B136
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
B280
B:
1 2 3
4 5 6
7 8 9 10 11 12 13 14 15 16 17
18 19 20
21 22 23 24
25 26
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
B40
C17
C28
C: B136
B230
3
2
B310
10
35
LAN00907
SI
SI
SI
VDC CM
ECM
DCCD CM
YAW RATE &
G SENSOR
: WITH SI-DRIVE
DATA LINK
CONNECTOR
BODY
INTEGRATED
UNIT
STEERING
ANGLE
SENSOR
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