Subaru Forester 2004 Service Manual page 49

ENGINE (DIAGNOSTIC)
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
(B134) No. 17 (+) — Chassis ground (
2 CHECK POOR CONTACT.
3 CHECK 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-10, 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
(B134) No. 17 — (i12) No. 1:
5 CHECK POOR CONTACT.
Check poor contact in combination meter con-
nector.
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
(i10) No. 9 (+) — Chassis ground (
Malfunction Indicator Light
Is the voltage less than 1 V?
−
):
Does the malfunction indicator
light come on when shaking or
pulling the ECM connector and
harness?
Is the ECM connector correctly
connected?
Is the resistance less than 1
Ω?
Is there poor contact in combi-
nation meter connector?
Is the voltage more than 10 V? Replace the board
−
):
EN(H4DOTC 2.5)-48
Check
Go to step 4.
Repair the poor
contact in ECM
connector.
Replace the ECM.
<Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
Go to step 5.
Repair poor con-
tact in combination
meter connector.
of combination
meter. <Ref. to IDI-
10, Combination
Meter Assembly.>
Yes No
Go to step 2.
Go to step 3.
Repair the con-
nection of ECM
connector.
Repair the 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
Go to step 6.
Check the follow-
ing and repair if
necessary.
NOTE:
• Blown out of
fuse (No. 14)
• Open or short
circuit in harness
between fuse (No.
14) and battery
terminal
• Poor contact in
ignition switch con-
nector