Subaru IMPREZA GD 2007 Series Manual page 1181

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 29 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN ECM AND
PURGE CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
purge control solenoid valve.
3) Measure the resistance between the purge
control solenoid valve connector and engine
ground.
Connector & terminal
(E4) No. 2 — Engine ground:
3 CHECK HARNESS BETWEEN ECM AND
PURGE CONTROL SOLENOID VALVE.
Measure the resistance of harness between
ECM and purge control solenoid valve.
Connector & terminal
(B137) No. 29 — (E4) No. 2:
4 CHECK PURGE CONTROL SOLENOID
VALVE.
1) Remove the purge control solenoid valve.
2) Measure the resistance between purge con-
trol solenoid valve terminals.
Terminals
No. 1 — No. 2:
5 CHECK POWER SUPPLY TO PURGE CON-
TROL SOLENOID VALVE.
1) Turn the ignition switch to ON.
2) Measure the voltage between purge control
solenoid valve and engine ground.
Connector & terminal
(E4) No. 1 (+) — Engine ground (–):
Check
Is the voltage 10 V or more?
Is the resistance 1 MΩ or
more?
Is the resistance less than 1 Ω? Go to step 4.
Is the resistance between 10 —
100 Ω?
Is the voltage 10 V or more?
EN(H4DOTC)(diag)-230
Yes No
Repair poor con- Go to step 2.
tact of the ECM
connector.
Go to step 3. Repair short cir-
cuit of the harness
to ground between
ECM and purge
control solenoid
valve connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and purge
control solenoid
valve connector
• Poor contact of
coupling connector
Go to step 5.
Replace the purge
control solenoid
valve. <Ref. to
EC(H4DOTC)-8,
Purge Control
Solenoid Valve.>
Repair the poor Repair the harness
contact of purge and connector.
control solenoid
NOTE:
valve connector.
In this case, repair
the following item:
• Open circuit of
harness between
the main relay and
purge control sole-
noid valve
• Poor contact of
coupling connector
• Poor contact of
main relay connec-
tor