Subaru 2006 Legacy, Manual

Page: 2604 / 4302

EN(H6DO)(diag)-2 88
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
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. Regarding the procedures, refer to “Com-
pulsory Valve Operation Check Mode”. <Ref. to
EN(H6DO)(diag)-46, Compulsory Valve Opera-
tion Check Mode.>
Connector & terminal
(B136) No. 28 (+) — Chassis ground (–):
Does the voltage change
between 0 — 10 V? 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.
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 (–):
Is the voltage more than 10 V? Go to step
4
. Go to step
3
.
3 CHECK POOR CONTACT.
Check the poor contact of ECM connector.
Is there poor contact in ECM
connector? Repair the poor
contact of ECM
connector. Replace the ECM.
<Ref. to
FU(H6DO)-33,
Engine Control
Module (ECM).>
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 (–):
Is the voltage more than 10 V? Repair the battery
short circuit of har-
ness between
ECM and pressure
control solenoid
valve connector.
After repair,
replace the ECM.
<Ref. to
FU(H6DO)-33,
Engine Control
Module (ECM).>
Go to step 5 .
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:
Is the resistance less than 1
Ω
?
Replace the purge
control solenoid
valve <Ref. to
EC(H6DO)-11,
Pressure Control
Solenoid
Valve.>and ECM
<Ref. to
FU(H6DO)-33,
Engine Control
Module (ECM).> Go to step
6
.
6 CHECK POOR CONTACT.
Check the poor contact of ECM connector.
Is there poor contact in ECM
connector? Repair the poor
contact of ECM
connector. Replace the ECM.
<Ref. to
FU(H6DO)-33,
Engine Control
Module (ECM).>
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