Subaru Legacy 2002 Service Manual page 573

ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (Diagnostics)
No.
3 CHECK HARNESS BETWEEN TEST MODE
CONNECTOR AND CHASSIS GROUND.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure 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 test mode connector.
2) Measure resistance of harness between
ECM and chassis ground.
Connector & terminal
(B135) No. 14 — Chassis ground:
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Step
Is resistance less than 1
Ω?
Is there poor contact in
ECM connector?
Is resistance less than 1
Ω?
Is there poor contact in
ECM connector?
EN-56
Check Yes
Go to step 4.
Repair poor con-
tact in ECM con-
nector.
Go to step 6.
Repair poor con-
tact in ECM con-
nector.
No
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
test mode con-
nector and chas-
sis ground
Go to step 5.
Repair open cir-
cuit in harness
between ECM
and test mode
connector.
Replace ECM.
<Ref. to FU-51,
Engine Control
Module.>