Subaru LEGACY 2004 Service Manual page 764

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
1 CHECK TCM.
1) Disconnect the TCM connector (B54).
2) Perform the clear memory of body inte-
grated unit. <Ref. to LAN(diag)-20, CLEAR
MEMORY MODE, OPERATION, Subaru
Select Monitor.>
3) Read DTC of body integrated unit.
2 CHECK STEERING ANGLE SENSOR.
1) Disconnect the steering angle sensor con-
nector (B231).
2) Perform the clear memory mode of body
integrated unit. <Ref. to LAN(diag)-20, CLEAR
MEMORY MODE, OPERATION, Subaru
Select Monitor.>
3) Read DTC of body integrated unit.
3 CHECK BODY INTEGRATED UNIT.
1) Disconnect the body integrated unit con-
nector (B280).
2) Read the data between VDC/ABSCM and
ECM.
Check item:
• Engine speed
• Average front wheel speed (value on con-
stant driving)
4 CHECK HARNESS.
1) Disconnect the body integrated unit con-
nector (B280).
2) Measure the resistance between harness
connector terminals.
Connector & terminal
(B280) No. 20 — No. 30:
5 CHECK HARNESS.
1) Disconnect the body integrated unit con-
nector (B280).
2) Measure the resistance between harness
connector terminals.
Connector & terminal
(B280) No. 20 — No. 30:
6 CHECK HARNESS.
1) Disconnect the harness connector of body
integrated unit.
2) Measure the resistance between harness
connector terminals.
Connector & terminal
(B280) No. 20 — No. 30:
7 CHECK HARNESS.
1) Disconnect the VDC/ABSCM connector
(ABS:B301, VDC:310).
2) Measure the resistance between harness
connector terminals.
Connector & terminal
ABS
(B301) No. 11 — No. 26:
VDC
(B310) No. 13 — No. 29:
Check
Is DTC (B0202) displayed?
Is DTC (B0202) displayed?
Engine speed, front wheel
speed is correctly communi-
cated. (Appears same value)
Is the resistance 55 — 65 "?
Is the resistance 115 — 125
"?
Is the resistance more than 30
M"?
Is the resistance 115 — 125
"?
LAN(diag)-48
Yes
Go to step 2. Replace the TCM.
<Ref. to 4AT-140,
Transmission Con-
trol Device.> <Ref.
to 5AT-61, Trans-
mission Control
Module (TCM).>
Go to step 3. Replace the steer-
ing angle sensor.
<Ref. to VDC-16,
REPLACEMENT,
Steering Angle
Sensor.>
Replace the body Go to step 4.
integrated unit.
<Ref. to SL-46,
Body Integrated
Unit.>
Go to step 10. Go to step 5.
Go to step 7. Go to step 6.
Open harness on Go to step 7.
related line of body
integrated unit.
Repair or replace
the open circuit of
harness.
Go to step 8. Go to step 9.
No