Subaru 2002 IMPREZA Service Manual page 503

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
s the value more than 4.9 V?
!
Yes
Go to step 2.
~~
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.
s the resistance less than 5
3?
CHECK HARNESS BETWEEN TUMBLE
GENERATOR VALVE POSITION SENSOR
4ND ECM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from tumble gen-
erator valve position sensor.
3)Measure the resistance of harness between
throttle position sensor connector and engine
ground.
Connector & terminal
(€50) No. 2
-
Engine ground:
Go to step
3 .
I CHECK HARNESS BETWEEN TUMBLE
GENERATOR VALVE POSITION SENSOR
AND ECM CONNECTOR.
1)Turn the ignition switch to ON.
2)Measure the voltage between throttle posi-
tion sensor connector and engine ground.
(€50) No. 3 (+)
-
Engine ground ( - ) :
Connector & terminal
short circuit in har-
ness between tum-
ble generator valve
position sensor
and ECM connec-
tor. After repair,
replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
TURBO)-47,
No
Even if MIL lights
up, the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
Df
the connector
may be the cause.
NOTE:
In this case, repair
the following:
b
Poor contact in
tumble generator
valve position sen-
sor connector
b
Poor contact in
ECM connector
Poor contact in
soupling connectot
Repair harness
and connector.
NOTE:
In this case, repair
the following:
b
Open circuit in
harness between
tumble generator
valve position sen-
sor and ECM con-
nector
b
Poor contact in
soupling connector
b
Poor contact in
ioint connector
Replace the tum-
ble generator valve
assembly. <Ref. to
FU(D0HC
TURBO)-40, Tum-
ble Generator
Valve Assembly.>
EN(D0HC TURBO)-279