Subaru Legacy 2003 Service Manual page 851

ENGINE MALFUNCTION INDICATOR LAMP (MIL)
ENGINE (DIAGNOSTICS)
2 CHECK POOR CONTACT.
Does the MIL come on when shaking or pulling
ECM connector and harness?
3 CHECK ECM CONNECTOR.
Is ECM connector correctly connected?
4 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Remove combination meter. <Ref. to IDI-
14, Combination Meter Assembly.>
3) Disconnect connector from ECM and com-
bination meter.
4) Measure resistance of harness between
ECM and combination meter connector.
Connector & terminal
(B134) No. 11 — (i12) No. 5:
Is the measured value less than the speci-
fied value?
5 CHECK POOR CONTACT.
Check poor contact in combination meter con-
nector. <Ref. to IDI-14, Combination Meter
Assembly.>
Is there poor contact in combination meter
connector?
6 CHECK HARNESS BETWEEN COMBINA-
TION METER AND IGNITION SWITCH CON-
NECTOR.
1) Turn ignition switch to ON.
2) Measure voltage between combination
meter connector and chassis ground.
Connector & terminal
(i12) No. 3 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
Step
EN(H4SOw/oOBD)-32
Value
MIL illuminates.
ECM connector is connected
correctly.
1 Ω
There is poor contact.
10 V
Yes
Repair poor con- Go to step 3.
tact in ECM con-
nector.
Replace ECM. Repair connection
of ECM connector.
Go to step 5. Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and combi-
nation meter con-
nector
• Poor contact in
coupling connector
Repair poor con- Go to step 6.
tact in combination
meter connector.
Go to step 7. Check the follow-
ing and repair if
necessary.
NOTE:
• Broken down
ignition relay.
• Blown out fuse
(No. 5).
• If replaced fuse
(No. 5) blows eas-
ily, check the har-
ness for short
circuit of harness
between fuse (No.
5) and ignition
relay connector.
• Open or short
circuit in harness
between fuse (No.
5) and battery ter-
minal
• Open circuit in
harness between
fuse (No. 5) and
ignition relay con-
nector
• Poor contact in
ignition relay con-
nector
• Poor contact in
ignition switch
connector
No