Subaru Legacy 2003 Service Manual page 2060

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK INPUT SIGNAL TO ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 12 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
2 CHECK HARNESS BETWEEN RELIEF
VALVE CONTROL SOLENOID VALVE 1 AND
ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from relief valve
control solenoid valve 1 and ECM.
3) Measure the resistance of harness
between relief valve control solenoid valve
1 connector and engine ground.
Connector & terminal
(B220) No. 4 — Engine ground:
Does the measured value exceed the spec-
ified value?
3 CHECK HARNESS BETWEEN RELIEF
VALVE CONTROL SOLENOID VALVE 1 AND
ECM CONNECTOR.
Measure the resistance of harness between
ECM and relief valve control solenoid valve 1
of harness connector.
Connector & terminal
(B136) No. 12 — (B220) No. 4:
Is the measured value less than the specified
value?
4 CHECK RELIEF VALVE CONTROL SOLE-
NOID VALVE 1.
Measure the resistance between relief valve
control solenoid valve 1 terminals.
Terminals
No. 3 — No. 4:
Is the measured value within the specified
value?
5 CHECK POWER SUPPLY TO RELIEF VALVE
CONTROL SOLENOID VALVE 1.
1) Turn the ignition switch to ON.
2) Measure the voltage between relief valve
control solenoid valve 1 and engine ground.
Connector & terminal
(B220) No. 3 (+) — Engine ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
Value
10 V
1 MΩ
1 Ω
37 — 44 Ω
10 V
EN(H4DOSTC)-221
ENGINE (DIAGNOSTICS)
Yes
Even if MI lights Go to step 2.
up, the circuit has
returned to a nor-
mal condition at
this time. Contact
with your Subaru
distributor.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
Go to step 3. Repair the ground
short circuit in har-
ness between
ECM and relief
valve control sole-
noid valve 1 con-
nector.
Go to step 4. Repair the open
circuit in harness
between ECM and
relief valve control
solenoid valve 1
connector.
Go to step 5. Replace the relief
valve control sole-
noid valve 1.
<Ref. to
IN(H4DOSTC)-19,
Solenoid Box
Assembly.>
Go to step 6. Repair the open
circuit in harness
between main
relay and relief
valve control sole-
noid valve 1 con-
nector.
No