Subaru 2009 IMPREZA Service Manual page 1514

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
LH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
tumble generator valve assembly LH.
3) Measure the resistance of harness between
ECM and tumble generator valve assembly LH.
Connector & terminal
(B137) No. 12 — (E51) No. 5:
(B137) No. 13 — (E51) No. 4:
2 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
LH CONNECTOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B137) No. 12 — Chassis ground:
(B137) No. 13 — Chassis ground:
3 CHECK POOR CONTACT.
Check for poor contact of tumble generator
valve assembly LH connector.
Check
Is the resistance less than 1 ? Go to step 2.
Is the resistance 1 M or
more?
Is there poor contact of the tum-
ble generator valve assembly
LH connector?
EN(H4DOTC)(diag)-293
ENGINE (DIAGNOSTICS)
Yes No
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and tumble
generator
assembly LH con-
nector
• Poor contact of
coupling connector
Go to step 3. Repair the short
circuit to ground in
harness between
ECM and tumble
generator valve
assembly LH con-
nector.
Repair the poor Replace the tum-
contact of tumble ble generator valve
generator valve assembly LH.
assembly LH con- <Ref. to
nector. FU(H4DOTC)-44,
Tumble Generator
Valve Assembly.>
valve