Subaru 2006 Legacy, Manual

Page: 1761 / 4302

EN(H4DOTC)(diag)-259
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step Check Yes No
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 procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-24, Subaru Select Mon-
itor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the voltage less than 0.1 V? Go to step
2
. Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector
may be the cause.
NOTE:
In this case, repair
the following item:
• Poor contact of
tumble generator
valve position sen-
sor connector
• Poor contact in
ECM connector
• Poor contact of
coupling connector
2 CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 16 (+) — Chassis ground (–):
Is the voltage more than 4.5 V? Go to step 4 . Go to step 3 .
3 CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 16 (+) — Chassis ground (–):
Does the voltage change when
shaking the harness and con-
nector of the ECM while moni-
toring the value with a voltage
meter? Repair the poor
contact of ECM
connector. Contact with SOA
Service Center.
4 CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 27 (+) — Chassis ground (–):
Is the voltage less than 0.1 V? Go to step 6 . Go to step 5 .
5 CHECK INPUT SIGNAL FOR ECM (USING
SUBARU SELECT MONITOR).
Measure the voltage between ECM connector
and chassis ground.
Does the voltage change by
shaking the harness and con-
nector of the ECM while moni-
toring the value with Subaru
Select Monitor? Repair the poor
contact of ECM
connector. Go to step 6 .
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