Subaru Legacy 2004 Service Manual page 480

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 CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness
between test mode connector and chassis
ground.
Connector & terminal
(B76) No. 1 — Chassis ground:
4 CHECK POOR CONTACT.
Check poor contact in ECM connector.
5 CHECK HARNESS BETWEEN ECM AND
TEST MODE CONNECTOR.
1) Connect the test mode connector.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B135) No. 24 — Chassis ground:
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
&?
Is there poor contact in ECM
connector?
Is the resistance less than 1
&?
Is there poor contact in ECM
connector?
EN(H4SO 2.0)(diag)-48
Check Yes
Go to step 2.
Repair the short
circuit in harness
between combina-
tion meter and
ECM connector.
Go to step 4.
Repair the poor
contact in ECM
connector.
Go to step 6.
Repair the poor
contact in ECM
connector.
No
Repair the mal-
function indictor
light circuit. <Ref.
to EN(H4SO
2.0)(diag)-43,
MALFUNCTION
INDICATOR
LIGHT DOES
NOT COME ON,
Malfunction Indica-
tor Light.>
Go to step 3.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
test mode connec-
tor and chassis
ground
Go to step 5.
Repair the open
circuit in harness
between ECM and
test mode connec-
tor.
Replace the ECM.
<Ref. to FU(H4SO
2.0)-34, Engine
Control Module
(ECM).>