Subaru Legacy 2003 Service Manual page 2051

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
5 CHECK POWER SUPPLY TO EXHAUST
VALVE CONTROL SOLENOID VALVE (NEG-
ATIVE PRESSURE).
1) Turn the ignition switch to ON.
2) Measure the voltage between exhaust
valve control solenoid valve (negative pres-
sure) and engine ground.
Connector & terminal
(B220) No. 5 (+) — Engine ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
6 CHECK POOR CONTACT.
Check poor contact in exhaust valve control
solenoid valve (negative pressure) and ECM
connectors.
Are there poor contact in exhaust valve control
solenoid valve (negative pressure) and ECM
connectors?
Step
EN(H4DOSTC)-212
Value
10 V
There are poor contacts.
Yes
Go to step 6. Repair the open
circuit in harness
between main
relay and exhaust
valve control sole-
noid valve (nega-
tive pressure)
connector.
Repair the poor Contact SUBARU
contact in exhaust distributor service.
valve control sole-
NOTE:
noid valve (nega-
Inspection by DTM
tive pressure) and
is required,
ECM connectors.
cause
cause is deteriora-
tion of
parts.
No
be-
probable
multiple