Subaru 2009 IMPREZA Service Manual page 1518

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 POWER SUPPLY OF TUMBLE GEN-
ERATOR VALVE ASSEMBLY RH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve assembly RH.
3) Turn the ignition switch to ON.
4) Measure the voltage between tumble gener-
ator valve assembly RH connector and engine
ground.
Connector & terminal
(E55) No. 3 (+) — Engine ground (–):
3 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance of harness between
ECM and tumble generator valve assembly RH.
Connector & terminal
(B134) No. 26 — (E55) No. 1:
4 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ASSEMBLY
RH CONNECTOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 26 — Chassis ground:
5 CHECK POOR CONTACT.
Check for poor contact of tumble generator
valve assembly RH connector.
Check
Is the voltage less than 0.2 V? Go to step 2.
Is the voltage 4.5 V or more?
Is the resistance less than 1 ? Go to step 4.
Is the resistance 1 M or
more?
Is there poor contact of ECM or
the tumble generator valve
assembly RH connector?
EN(H4DOTC)(diag)-297
ENGINE (DIAGNOSTICS)
Yes No
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.
Go to step 3. 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 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
coupling connector
Go to step 5. Repair the short
circuit to ground in
harness between
ECM and tumble
generator valve
assembly RH con-
nector.
Repair the poor Replace the tum-
contact of ECM or ble generator valve
tumble generator assembly RH.
valve assembly RH <Ref. to
connector. FU(H4DOTC)-44,
Tumble Generator
Valve Assembly.>
valve
valve