Subaru 2009 IMPREZA Service Manual page 671

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK HARNESS BETWEEN ECM AND
PRESSURE CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and pressure 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 (–):
2 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:
Check
Is the voltage 10 V or more?
Is the resistance less than 1 ? Replace the pres-
EN(H4SO)(diag)-254
Yes No
Repair the short Go to step 2.
circuit to power in
the harness
between ECM and
pressure control
solenoid valve con-
nector.
Repair the poor
sure control sole- contact of ECM
noid valve. <Ref. to connector.
EC(H4SO)-16,
Pressure Control
Solenoid Valve.>