Subaru Legacy 2002 Service Manual page 1472

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 23 (+) — Chassis ground
(−):
2 CHECK HARNESS BETWEEN INDUCTION
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from induction con-
trol solenoid valve and ECM.
3) Measure resistance of harness between
induction control solenoid valve connector and
engine ground.
Connector & terminal
(E30) No. 2 — Engine ground:
3 CHECK HARNESS BETWEEN INDUCTION
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
Measure resistance of harness between ECM
and induction control solenoid valve of har-
ness connector.
Connector & terminal
(B137) No. 23 — (E30) No. 2:
4 CHECK INDUCTION CONTROL SOLENOID
VALVE.
1) Remove induction control solenoid valve.
2) Measure resistance between induction con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
5 CHECK POWER SUPPLY TO INDUCTION
CONTROL SOLENOID VALVE.
1) Turn ignition switch to ON.
2) Measure voltage between induction control
solenoid valve and engine ground.
Connector & terminal
(E30) No. 1 (+) — Engine ground (−):
Step
Is the voltage more than 10
V?
Is the resistance less than
10 Ω?
Is the resistance less than
1 Ω?
Is the resistance between
37 and 44 Ω?
Is the voltage more than 10
V?
EN(H6)-265
Check Yes
Even if MIL lights
up, the circuit has
returned to a nor-
mal condition at
this time. Contact
your Subaru dis-
tributor.
NOTE:
Inspection by
DTM is required,
because probable
cause is deterio-
ration of multiple
parts.
Repair ground
short circuit in
harness between
ECM and induc-
tion control sole-
noid valve con-
nector.
Go to step 4.
Go to step 5.
Go to step 6.
Engine (DIAGNOSTICS)
No
Go to step 2.
Go to step 3.
Repair open cir-
cuit in harness
between ECM
and induction con-
trol solenoid valve
connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ECM and induc-
tion control sole-
noid valve con-
nector
¼ Poor contact in
coupling connec-
tor
Replace induction
control solenoid
valve. <Ref. to
FU(H6)-38, Induc-
tion Valve Control
Solenoid.>
Repair open cir-
cuit in harness
between main
relay and induc-
tion control sole-
noid valve con-
nector.