Subaru Impreza 2003, Service Manual

Page: 1230 / 3610

EN(H4DOTC)-54
ENGINE (DIAGNOSTICS)
MALFUNCTION INDICATOR LIGHT
3 CHECK ECM CONNECTOR. Is the ECM connector correctly
connected? Replace the ECM.
<Ref. to
FU(H4DOTC)-49,
Engine Control
Module (ECM).> Repair the con-
nection of ECM
connector.
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-
14, Combination Meter Assembly.>
3)Disconnect the connector from ECM and
combination meter.
4)Measure the resistance of harness between
ECM and combination meter connector.
Connector & terminal
(B84) No. 15 — (i12) No. 6:
Is the resistance less than 1
Ω
?
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
5 CHECK POOR CONTACT.
Check poor contact in combination meter con-
nector.
Is there poor contact in combi-
nation meter connector? Repair the poor
contact in combi-
nation meter con-
nector. Go to step 6.
6 CHECK HARNESS BETWEEN COMBINA-
TION METER AND IGNITION SWITCH CON-
NECTOR.
1)Turn the ignition switch to ON.
2)Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i11) No. 7 (+) — Chassis ground (
−−−−
):
Is the voltage more than 10 V? Replace the com-
bination meter cir-
cuit board. <Ref.
to IDI-14, Combi-
nation Meter
Assembly.>
Check the follow-
ing and repair if
necessary.
NOTE:
• Blown out fuse
(No. 14)
• Open or short
circuit in harness
between fuse (No.
14) and battery
terminal
• Poor contact in
ignition switch
connector
Step Check Yes No