Subaru Legacy 2003 Service Manual page 1880

ENGINE MALFUNCTION INDICATOR LAMP (MI)
Step
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B137) No. 15 (+) — 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 the ECM connector correctly connected?
4 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the combination meter. <Ref. to
IDI-15, Combination Meter Assembly.>
3) Disconnect the connector from ECM and
combination meter.
4) Measure the resistance of harness
between ECM and combination meter con-
nector.
Connector & terminal
(B137) No. 15 — (i11) No. 10:
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(H4DOSTC)-41
ENGINE (DIAGNOSTICS)
Yes
Go to step 4. Go to step 2.
Repair the poor Go to step 3.
contact in ECM
connector.
Replace the ECM. Repair the con-
<Ref. to nection of ECM
FU(H4DOSTC)- connector.
40, Engine Con-
trol Module.>
Go to step 5. Repair the har-
ness and connec-
tor.
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 the poor Go to step 6.
contact in combi-
nation meter con-
nector.
No