Subaru 2002 IMPREZA Service Manual page 499

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK CURRENT DATA.
1)Start the engine.
2)Read the data of tumble generator valve
position sensor signal using Subaru Select
Monitor or OBD-ll general scan tool.
NOTE:
*Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(D0HC TURBO)-38, Subaru Select Mon-
itor.>
*OBD-ll general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
!
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground while tumble generator
valve is fully closed.
'Connector & terminal
(8135) No. 9 (+)
-
Chassis ground ( -):
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
I
Connector & terminal
(8135) No. 9 (+)
-
Chassis ground (-):
I
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8 135) No. 13 (+)
-
Chassis ground ( - ) :
I
CHECK INPUT SIGNAL FOR ECM. (USING
SUBARU SELECT MONITOR.)
Measure the voltage between ECM connector
and chassis ground.
Check
s the value less than 0.1 V?
s the voltage more than 4.5 V?
loes the voltage change more
han 4.5 V by shaking harness
md connector of ECM while
nonitoring the value with volt-
ige meter?
s
the voltage less than 0.1 V?
loes the voltage change more
han 0.1 V by shaking harness
md connector of ECM while
nonitoring the value with Sub-
3ru Select Monitor?
Yes
30 to step 2.
20
to step 4.
3epair poor con-
act in ECM con-
lector.
30 to step 6.
3epair poor con-
:act in ECM con-
lector.
No
Even if MIL lights
up, 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, repaii
the following:
Poor contact in
throttle position
sensor connector
Poor contact in
ECM connector
Poor contact in
coupling connect0
Go to step 3.
Contact with SOA
(distributor) ser-
vice.
NOTE:
Inspection by DTk
is required, be
cause probable
cause is deteriora
tion of multiple
parts.
Go to step 5.
Go to step 6.
EN(D0HC TURBO)-275