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Subaru 2009 IMPREZA Service Manual page 1524

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1
CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of tumble generator valve
position sensor signal (LH) using Subaru Select
Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
2
CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
LH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve assembly LH.
3) Start the engine.
4) Read the data of tumble generator valve
position sensor signal (LH) using Subaru Select
Monitor or general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4DOTC)(diag)-34, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedures, refer to the
general scan tool operation manual.
3
CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
LH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
tumble generator valve assembly LH connector
and engine ground.
Connector & terminal
(E51) No. 2 — Engine ground:
4
CHECK POOR CONTACT.
Check for poor contact of tumble generator
valve assembly LH connector.
Check
Is the voltage 5 V or more?
Is the voltage 5 V or more?
Is the resistance less than 5 ? Go to step 4.
Is there poor contact of the tum-
ble generator valve assembly
LH connector?
EN(H4DOTC)(diag)-303
ENGINE (DIAGNOSTICS)
Yes
No
Go to step 2.
Even if DTC is
detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.
Repair the short
Go to step 3.
circuit to power in
harness between
ECM and tumble
generator valve
assembly LH con-
nector.
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
ECM connector
• Poor contact of
coupling connector
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

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