Subaru LEGACY 2006 Manual page 294

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to OFF.
2) Connect the test mode connector at the
lower portion of instrument panel (on the
driver's side).
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground while operating the pressure
control solenoid valve.
NOTE:
The pressure control solenoid valve operation
can be executed using the Subaru Select Mon-
itor. For procedure, refer to "Compulsory Valve
Operation Check Mode".
<Ref. to EN(H4SO)(diag)-44, Compulsory
Valve Operation Check Mode.>
Connector & terminal
(B136) No. 28 (+) — Chassis ground (–):
2 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 28 (+) — Chassis ground (–):
3 CHECK POOR CONTACT.
Check poor contact of ECM connector.
4 CHECK HARNESS BETWEEN PRESSURE
CONTROL SOLENOID VALVE AND ECM
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the pres-
sure control solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 28 (+) — Chassis ground (–):
5 CHECK PRESSURE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between pressure
control solenoid valve terminals.
Terminals
No. 1 — No. 2:
6 CHECK POOR CONTACT.
Check poor contact of ECM connector.
Check
Is the voltage 0 — 10 V?
Is the voltage more than 10 V? Go to step 4.
Is there poor contact in ECM
connector?
Is the voltage more than 10 V? Repair the battery
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
EN(H4SO)(diag)-257
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair the
poor contact in
ECM connector.
Go to step 3.
Repair the poor Replace the ECM.
contact of ECM <Ref. to
connector. FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 5.
short circuit of har-
ness between
ECM and pressure
control solenoid
valve connector.
After repair,
replace the ECM.
<Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 6.
Replace the pres-
sure control sole-
noid valve <Ref. to
EC(H4SO)-12,
Pressure Control
Solenoid Valve.>
and ECM <Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>.
Repair the poor Replace the ECM.
contact of ECM <Ref. to
connector. FU(H4SO)-36,
Engine Control
Module (ECM).>