Subaru Legacy 2005 Service Manual page 1286

ENGINE (DIAGNOSTICS)
Step
1 CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the test mode connectors.
3) Turn the ignition switch to ON. (engine
OFF)
2 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.
3 CHECK HARNESS BETWEEN TEST MODE
CONNECTOR AND ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness
between test mode connector and ECM.
Connector & terminal
(B76) No. 1 — (B136) No. 19:
4 CHECK POOR CONTACT.
Check poor contact in ECM connector.
5 CHECK HARNESS BETWEEN ECM AND
TEST MODE CONNECTOR.
Measure the resistance of harness between
ECM and test mode connector.
Connector & terminal
(B137) No. 15 — (B75) No. 1:
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Malfunction Indicator Light
Does the malfunction indicator
light illuminate?
Does the malfunction indicator
light illuminate?
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
EN(H4DOTC)(diag)-46
Check
Go to step 2.
Repair the ground
short circuit of har-
ness between
combination meter
and ECM connec-
tor.
Go to step 4.
Repair the poor
contact in ECM
connector.
Go to step 6.
Repair the poor
contact in ECM
connector.
Yes No
Repair the mal-
function indictor
light circuit. <Ref.
to
EN(H4DOTC)(diag
)-42, MALFUNC-
TION INDICATOR
LIGHT DOES NOT
COME ON, Mal-
function Indicator
Light.>
Go to step 3.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
test mode connec-
tor and ECM
• Poor contact in
joint connector
Go to step 5.
Repair the open
circuit of harness
between ECM and
test mode connec-
tor.
Replace the ECM.
<Ref. to
FU(H4DOTC)-34,
Engine Control
Module (ECM).>