Subaru 2009 IMPREZA Service Manual page 480

Step
1 CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(B136) No. 11 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the combination meter. <Ref. to
IDI-16, Combination Meter.>
3) Disconnect the connector from ECM and
combination meter.
4) Measure the resistance of harness between
ECM and combination meter connector.
Connector & terminal
(B136) No. 11 — (i10) No. 38:
3 CHECK POOR CONTACT.
Check for poor contact of combination meter
connector.
4 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
(i10) No. 2 (+) — Chassis ground (–):
5 CHECK POOR CONTACT.
Check for poor connection by shaking or pulling
ECM connector and harness.
6 CHECK ECM CONNECTOR.
Check the connection of ECM connector.
Malfunction Indicator Light
Is the voltage 10 V or more?
Is the resistance less than 1 ? Go to step 3.
Is there poor contact of combi-
nation meter connector?
Is the voltage 10 V or more?
Does the malfunction indicator
light illuminate?
Is the ECM connector correctly
connected?
EN(H4SO)(diag)-63
Check Yes
Go to step 5.
Repair the poor
contact of combi-
nation meter con-
nector.
Replace the com-
bination meter cir-
cuit board. <Ref. to
IDI-16, Combina-
tion Meter.>
Repair the poor
contact of ECM
connector.
Replace the ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module (ECM).>
ENGINE (DIAGNOSTICS)
No
Go to step 2.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and combi-
nation meter con-
nector
• Poor contact of
coupling connector
Go to step 4.
Check the follow-
ing item and repair
if necessary.
NOTE:
• Blown out of fuse
(No. 5)
• Open or short
circuit in harness
between fuse (No.
5) and battery ter-
minal
• Poor contact of
ignition switch con-
nector
Go to step 6.
Repair the connec-
tion of ECM con-
nector.