Subaru LEGACY 2004 Service Manual page 762

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
J: DTC B0201 CAN-HS COUNTER ABNORMAL
DTC DETECTING CONDITION:
High speed CAN communication of body integrated unit which monitoring the error data and non-received
data are faulty.
TROUBLE SYMPTOM:
• "Er HC" is displayed in odo/trip meter.
• Engine malfunction indicator light illuminates.
Step
1 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:
2 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:
3 CHECK HARNESS.
1) Disconnect the body integrated unit con-
nector (B280).
2) Measure the input voltage between har-
ness connector and chassis ground while turn-
ing the ignition switch to ON.
Connector & terminal
(B280) No. 20 (+) — Chassis ground (
(B280) No. 30 (+) — Chassis ground (
4 CHECK HARNESS.
1) Disconnect the body integrated unit con-
nector (B280).
2) Measure the resistance between harness
connector and chassis ground.
Connector & terminal
(B280) No. 20 — Chassis ground:
(B280) No. 30 — Chassis ground:
5 CHECK BODY INTEGRATED UNIT.
Read the data of "body integrated unit data
received" on ECM data display using Subaru
Select Monitor.
6 CHECK BODY INTEGRATED UNIT.
Read the data of "body integrated unit counter
update" on ECM data display using Subaru
Select Monitor.
Check
Is the resistance 55 — 65 "?
Is the resistance more than 30
M"?
Is the voltage more than 6 V?
!
):
!
):
Is the resistance less than 10
"?
Is the "Yes" displayed?
Is the "Yes" displayed?
LAN(diag)-46
Yes
Temporary poor Go to step 2.
contact occurs.
Repair or replace Go to step 3.
the open circuit of
harness.
Repair or replace Go to step 4.
the short circuit of
harness.
Repair or replace Go to step 5.
the short circuit of
harness.
Go to step 6. Replace the body
integrated unit.
<Ref. to SL-46,
Body Integrated
Unit.>
Temporary poor Replace the body
contact occurs. integrated unit.
Check the con- <Ref. to SL-46,
nected condition of Body Integrated
connector, read Unit.>
the DTC again to
make sure that the
DTC is not output.
No