Subaru Legacy 2001 Service Manual page 66

ENGINE MALFUNCTION INDICATOR LAMP (MIL)
Engine (DIAGNOSTICS)
No.
1 CHECK STATUS OF CHECK ENGINE MAL-
FUNCTION INDICATOR LAMP (MIL).
1) Turn ignition switch to OFF.
2) Disconnect test mode connector.
3) Turn ignition switch to ON. (engine OFF)
2 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Turn ignition switch to ON.
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
(B134) No. 5 — Chassis ground:
6 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Step
Does the MIL come on?
Does the MIL come on?
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(H6)-64
Check Yes
Go to step 2.
Repair ground
short circuit in
harness between
combination meter
and ECM connec-
tor.
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 the MIL
circuit. <Ref. to
EN(H6)-56
CHECK ENGINE
MALFUNCTION
INDICATOR
LAMP (MIL)
DOES NOT
COME ON.,
Engine Malfunc-
tion Indicator
Lamp (MIL).>
Go to step 3.
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(H6)-
46, Engine Con-
trol Module.>