Subaru Legacy 2002 Service Manual page 1476

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK INPUT SIGNAL OF 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 POOR CONTACT.
Check poor contact in ECM connector.
3 CHECK HARNESS BETWEEN INDUCTION
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from induction con-
trol solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B134) No. 23 (+) — Chassis ground
(−):
4 CHECK INDUCTION CONTROL SOLENOID
VALVE.
1) Turn ignition switch to OFF.
2) Measure resistance between induction con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
5 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Step
Is the voltage more than 10
V?
Is there poor contact in
ECM connector?
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
Is there poor contact in
ECM connector?
EN(H6)-269
Check Yes
Go to step 3.
Repair poor con-
tact in ECM con-
nector.
Repair battery
short circuit in
harness between
ECM and induc-
tion control sole-
noid valve con-
nector. After
repair, replace
ECM. <Ref. to
FU(H6)-47,
Engine Control
Module.>
Replace induction
control solenoid
valve <Ref. to
FU(H6)-38, Induc-
tion Valve Control
Solenoid.> and
ECM <Ref. to
FU(H6)-47,
Engine Control
Module.>
Repair poor con-
tact in ECM con-
nector.
Engine (DIAGNOSTICS)
No
Go to step 2.
Replace ECM.
<Ref. to FU(H6)-
47, Engine Con-
trol Module.>
Go to step 4.
Go to step 5.
Replace ECM.
<Ref. to FU(H6)-
47, Engine Con-
trol Module.>