Subaru B9 TRIBECA WX 2007 Manual page 625

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
1 CHECK DTC.
Check the DTC displayed in the body integrated
unit.
2 CHECK DTC.
Turn the ignition switch to OFF, and read the
DTC again.
3 CHECK CURRENT DATA.
On the Subaru Select Monitor, display engine
speed and vehicle speed at the ECM, TCM,
VDC/ABS and body integrated unit under the
same conditions, and compare the data.
4 CHECK TCM.
1) Disconnect the TCM connector (B54).
2) Clear the memory of the body integrated
unit. <Ref. to LAN(diag)-20, CLEAR MEMORY
MODE, OPERATION, Subaru Select Monitor.>
3) Read DTC of body integrated unit.
5 CHECK STEERING ANGLE SENSOR.
1) Disconnect the steering angle sensor con-
nector (B231).
2) Perform the Clear Memory Mode of the
body integrated unit. <Ref. to LAN(diag)-20,
CLEAR MEMORY MODE, OPERATION, Sub-
aru Select Monitor.>
3) Read DTC of body integrated unit.
6 CHECK YAW RATE SENSOR.
1) Disconnect the yaw rate sensor connector
(B359).
2) Perform the Clear Memory Mode of body
integrated unit.
3) Read DTC of body integrated unit.
7 CHECK BODY INTEGRATED UNIT.
1) Disconnect the body integrated unit connec-
tor (i84).
2) Read the data between VDC/ABSCM and
ECM.
Check item:
• Engine speed
• Average front wheel speed (value on con-
stant driving)
8 CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280).
2) Measure the resistance between harness
connector terminals.
Connector & terminal
(B280) No. 20 — No. 30:
9 CHECK HARNESS.
1) Disconnect the body integrated unit connec-
tor (B280).
2) Measure the resistance between harness
connector terminals.
Connector & terminal
(B280) No. 20 — No. 30:
Check
Is the DTC displayed a current
malfunction?
Is the DTC displayed a current
malfunction?
Do all data values match?
Is DTC U1202 displayed?
Is DTC U1202 displayed?
Is DTC U1202 displayed?
Engine speed and front wheel
speed are correctly communi-
cated. (Appears same value)
Is the resistance between 55 —
65 Ω?
Is the resistance between 115
— 125 Ω?
LAN(diag)-50
Yes No
Replace the body Go to step 2.
integrated unit.
Replace the body Go to step 3.
integrated unit.
A temporary poor Go to step 4.
contact has
occurred. Perform
the Clear Memory
operation.
Go to step 5. Check the TCM.
<Ref. to 5AT(diag)-
15, Subaru Select
Monitor.>
Go to step 6. Replace the steer-
ing angle sensor.
<Ref. to VDC-20,
REPLACEMENT,
Steering Angle
Sensor.>
Go to step 7. Check the yaw rate
sensor. <Ref. to
VDC(diag)-15,
READ DIAGNOS-
TIC TROUBLE
CODE (DTC),
OPERATION, Sub-
aru Select Moni-
tor.>
Replace the body Go to step 8.
integrated unit.
<Ref. to SL-51,
Body Integrated
Unit.>
Go to step 14. Go to step 9.
Go to step 11. Go to step 10.