Subaru IMPREZA GD 2007 Series Manual page 1264

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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 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)-36, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
2 CHECK POWER SUPPLY OF TUMBLE GEN-
ERATOR VALVE POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve position sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between tumble gener-
ator valve position sensor connector and engine
ground.
Connector & terminal
(E50) No. 1 (+) — Engine ground (–):
3 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance of harness between
ECM and tumble generator valve position sen-
sor connector.
Connector & terminal
(B134) No. 16 — (E50) No. 3:
4 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 16 — Chassis ground:
5 CHECK POOR CONTACT.
Check for poor contact in ECM and tumble gen-
erator valve position sensor 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 Ω? Go to step 4.
Is the resistance 1 MΩ or
more?
Is there poor contact in ECM
and tumble generator valve
position sensor connector?
EN(H4DOTC)(diag)-313
ENGINE (DIAGNOSTICS)
Yes No
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.
Go to step 3. 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 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 of
coupling connector
Go to step 5. Repair short cir-
cuit of the harness
to ground between
ECM and tumble
generator valve
position sensor
connector.
Repair the poor Replace the tum-
contact in ECM or ble generator valve
tumble generator position sensor.
valve position sen- <Ref. to
sor connector. FU(H4DOTC)-44,
Tumble Generator
Valve Position
Sensor.>