Subaru Legacy 2004 Service Manual page 1328

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 ECU.
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 malfunction indicator
light illuminate?
Does malfunction indicator
light illuminate?
Is the resistance less than 1
'?
Is the poor contact in ECM
connector?
Is the resistance less than 1
'?
Is the poor contact in ECM
connector?
EN(H4DOTC)(diag)-39
Check Yes
Go to step 2.
Repair the ground
short circuit in 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.
ENGINE (DIAGNOSTICS)
No
Repair the mal-
function indictor
light circuit.
<Ref. to
EN(H4DOTC)(diag
)-35, MALFUNC-
TION INDICA-
TOR 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 in
harness between
test mode connec-
tor and ECM
• Poor contact in
joint connector
Go to step 5.
Repair the open
circuit in harness
between ECM and
test mode connec-
tor.
Replace the ECM.
<Ref. to
FU(H4DOTC)-35,
Engine Control
Module (ECM).>