Subaru 2002 IMPREZA Service Manual page 339

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENG I NE (DIAGNOSTICS)
Yes
20 to step 9.
Step
CHECK CURRENT DATA.
1 )Start the engine.
2)Read the data of intake manifold absolute
pressure signal using Subaru Select Monitor or
OBD-II general scan tool.
NOTE:
Gubaru 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-ll General Scan Tool Instruction Manual.
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8135)
No. 9 (+)
-
Chassis ground (- ) :
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
gnd chassis ground.
,
Connector & terminal
(8135)
No.
9
(+)
-
Chassis ground (-):
No
Go to step 2.
1
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8135)
No. 8 (+)
-
Chassis ground ( - ) :
I
I
CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from pressure
sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between pressure sen-
sor connector and engine ground.
Connector & terminal
(E21)
No. 3 (+)
-
Engine ground (-):
i
CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
. 2)Disconnect the connector from ECM.
3)Measure the resistance of harness between
ECM and pressure sensor connector.
Connector & terminal
(8135) NO. 8
-
(E21) NO. 1:
3epair poor con-
act in ECM con-
lector.
30 to step 5.
30 to step 6.
Check
s the value more than 282 kPa
2121 mmHg, 83.50 inHg)?
Contact with SOA
(distributor) ser-
vice.
NOTE:
Inspection by DTk
is required, be
cause probable
cause is deteriora
tion of multiple
parts.
Contact with SOA
(distributor) ser-
vice.
NOTE:
Inspection by DTk
is required, be
cause probablt
cause is deteriora
tion of multiplt
parts.
Repair open circuil
in harness
between ECM and
pressure sensor
connector.
s the voltage more than 4.5 V?
30 to step 7.
Ioes the voltage change more
han 4.5 V by shaking harness
n d connector of ECM while
nonitoring the value with volt-
tge meter?
Repair open circuil
in harness
between ECM and
pressure sensor
connector.
s
the voltage less than 0.7 V?
s the voltage more than 4.5 V S
s
the resistance less than 1
2?
EN(D0HC TURBO)-1 15