Subaru 2009 IMPREZA Service Manual page 1520

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 (RH) 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
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve assembly RH.
3) Start the engine.
4) Read the data of tumble generator valve
position sensor signal (RH) 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
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
tumble generator valve assembly RH connector
and engine ground.
Connector & terminal
(E55) No. 2 — Engine ground:
4 CHECK POOR CONTACT.
Check for poor contact of tumble generator
valve assembly RH 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
RH connector?
EN(H4DOTC)(diag)-299
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 RH 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 RH 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 RH.
assembly RH con- <Ref. to
nector. FU(H4DOTC)-44,
Tumble Generator
Valve Assembly.>
valve