Subaru Legacy 2003 Service Manual page 450

ENGINE MALFUNCTION INDICATOR LAMP (MI)
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM connector
and chassis ground.
Connector & terminal
(B134) No. 28 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
2 CHECK POOR CONTACT.
Does the MI 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. 28 — (i12) No. 12: (LHD
model)
(B134) No. 28 — (i12) No. 15: (RHD
model)
Is the measured value less than the speci-
fied value?
5 CHECK POOR CONTACT.
Check poor contact in combination meter con-
nector.
Is there poor contact in combination meter
connector?
Value
1 V
MI illuminates.
Connected.
1 Ω
There is poor contact.
EN(H4SO)-53
ENGINE (DIAGNOSTICS)
Yes
Go to step 4. Go to step 2.
Repair poor con- Go to step 3.
tact in ECM con-
nector.
Replace ECM. Repair connection
<Ref. to of ECM connector.
FU(H4SO)-45,
Engine Control
Module.>
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.
No