Subaru IMPREZA GD 2007 Series Manual page 161

asieps_tobira_IM_US.book 52 ページ ２０１２年１月１７日 火曜日 午後３時４８分
ENGINE (DIAGNOSTICS)
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 POOR CONTACT.
Check for poor connection by shaking or pulling
ECM connector and harness.
3 CHECK ECM CONNECTOR.
Check the connection 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-11, 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 — (i12) No. 6:
5 CHECK POOR CONTACT.
Check poor contact of 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
(i11) No. 7 (+) — Chassis ground (–):
Malfunction Indicator Light
Check
Is the voltage less than 1 V?
Does the malfunction indicator
light illuminate?
Is the ECM connector correctly
connected?
Is the resistance less than 1 Ω? Go to step 5.
Is there poor contact in combi-
nation meter connector?
Is the voltage 10 V or more?
EN(H4SO)(diag)-52
Yes No
Go to step 4. Go to step 2.
Repair poor con- Go to step 3.
tact of the ECM
connector.
Replace the ECM. Repair the connec-
<Ref. to tion of ECM con-
FU(H4SO)-39, nector.
Engine Control
Module (ECM).>
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and combi-
nation meter con-
nector
• Poor contact of
coupling connector
Repair the poor Go to step 6.
contact of combi-
nation meter con-
nector.
Replace the com- Check the follow-
bination meter cir- ing item and repair
cuit board. <Ref. to if necessary.
IDI-11, Combina-
NOTE:
tion Meter.>
• Blown out of fuse
(No. 13)
• Open or short
circuit of harness
between fuse (No.
13) and battery ter-
minal
• Poor contact of
ignition switch con-
nector