Subaru 2002 IMPREZA Service Manual page 505

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
I
CHECK CURRENT DATA.
1)Start the engine.
2)Read the data of tumble generator valve
position sensor signal using Subaru Select
Monitor or OBD-II 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-II 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 throttle valve is fully
clised.
Connector & terminal
(8135) No. 9 (+)
-
Chassis ground (-):
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
I
Connector & terminal
(6135) No. 9 (+)
-
Chassis ground ( - ) :
I
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8135) No. 23 (+)
-
Chassis ground ( - ) :
1
CHECK INPUT SIGNAL FOR ECM. (USING
SUBARU SELECT MONITOR.)
Measure the voltage between ECM connector
and chassis ground.
Check
the value less than 0.1 V?
the voltage more than 4.5 V?
)es the voltage change more
%n 4.5 V by shaking harness
d connector of ECM while
mitoring the value with volt-
e meter?
the voltage less than 0.1 V?
)es the voltage change more
%n 0.1 V by shaking harness
d connector of ECM while
mitoring the value with Sub-
J
Select Monitor?
Yes
20 to step 2.
30 to step 4.
3epair poor con-
act in ECM con-
lector.
;o 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
tumble generator
valve position sen-
sor connector
8
Poor contact in
ECM connector
-
Poor contact in
coupling connectoi
Go to step 3.
Contact with SOA
(distributor) ser-
vice.
NOTE:
Inspection by DTM
is required, be.
cause probable
cause is deteriora.
tion of multiple
parts.
Go to step 5.
Go to step 6.
EN(D0HC TURBO)-281