Subaru LEGACY 2004 Service Manual page 792

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
1 CHECK COMMUNICATION LINE.
1) Warm up the engine.
2) Compare the data of body integrated unit
and combination meter using Subaru Select
Monitor.
Check item:
• Engine speed
• Each door switch
• P switch
2 CHECK HARNESS.
1) Disconnect the body integrated unit, combi-
nation meter connector.
2) Measure the resistance between harness
connectors.
Connector & terminal
(i10) No. 21 — (i84) No. 27:
(i10) No. 26 — (i84) No. 26:
3 CHECK HARNESS.
1) Disconnect the CAN joint connector (i77)
with connector of unit is disconnected.
2) Measure the resistance between harness
connector.
Connector & terminal
(i10) No. 21 — (i77) No. 1:
(i10) No. 26 — (i77) No. 7:
(i84) No. 27 — (i77) No. 2:
(i84) No. 26 — (i77) No. 8:
4 CHECK HARNESS.
Measure the resistance between harness con-
nector (i77) and chassis ground.
Connector & terminal
(i77) No. 1 — Chassis ground:
(i77) No. 7 — Chassis ground:
(i77) No. 2 — Chassis ground:
(i77) No. 8 — Chassis ground:
5 CHECK HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between harness con-
nector (i77) and chassis ground.
Connector & terminal
(i77) No. 1 (+) — Chassis ground (
(i77) No. 7 (+) — Chassis ground (
(i77) No. 2 (+) — Chassis ground (
(i77) No. 8 (+) — Chassis ground (
6 CHECK COMBINATION METER.
Perform the self-diagnosis for combination
meter. <Ref. to IDI-3, SELF-DIAGNOSIS,
INSPECTION, Combination Meter System.>
Check
Is the data displayed same?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is the resistance less than 10
"?
Is the voltage more than 6 V?
!
):
!
):
!
):
!
):
Is the self-diagnosis OK?
LAN(diag)-76
Yes
Go to step 2. Perform the self-
diagnosis for com-
bination meter.
<Ref. to IDI-3,
SELF-DIAGNO-
SIS, INSPEC-
TION,
Combination
Meter System.>
Go to step 4. Go to step 3.
Go to step 4. Repair or replace
the open circuit of
harness.
Repair or replace Go to step 5.
the short circuit of
harness.
Repair or replace Go to step 6.
the short circuit of
harness.
Temporary poor Check the connec-
contact occurs. tion of connector.
Replace the com-
bination meter.
<Ref. to IDI-16,
Combination
Meter Assembly.>
No