Subaru IMPREZA GD 2007 Series Manual page 1635

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of tumble generator valve
position sensor signal 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(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
2 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve position sensor.
3) Start the engine.
4) Read the data of tumble generator valve
position sensor signal 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(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
3 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
tumble generator valve position sensor connec-
tor and engine ground.
Connector & terminal
(E81) No. 2 — Engine ground:
4 CHECK POOR CONTACT.
Check for poor contact in the tumble generator
valve position sensor connector.
Check
Is the voltage 5 V or more?
Is the voltage 5 V or more?
Is the resistance less than 5 Ω? Go to step 4.
Is there poor contact in the tum-
ble generator valve position
sensor connector?
EN(STI)(diag)-304
Yes No
Go to step 2. Even if the malfunc-
tion indicator light
illuminates, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the fault con-
dition, and
reperform the
check.
NOTE:
In this case, there
may be a tempo-
rary connector
contact failure.
Repair the short Go to step 3.
circuit to power in
the harness
between ECM and
tumble generator
valve position sen-
sor connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and tumble
generator valve
position sensor
connector
• Poor contact in
ECM connector
• Poor contact of
coupling connector
Repair the poor Replace the tumble
contact of the tum- generator valve
ble generator valve position sensor.
position sensor <Ref. to
connector. FU(H4DOTC)-44,
Tumble Generator
Valve Position Sen-
sor.>