Subaru 2002 IMPREZA Service Manual page 335

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK CURRENT DATA.
1)Start the engine.
2)Read the data of intake manifold absolute
pressure signal using Subaru Select Monitor or
OBD-ll general scan tool.
NOTE:
OSubaru 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 poor contact in ECM and pressure sen-
sor connector.
I
CHECK POOR CONTACT.
I
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(6135) No. 9 (+)
-
Chassis ground ( - ) :
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(6135) No. 9 (+)
-
Chassis ground ( - ) :
1
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(8135) No. 8 (+)
-
Chassis ground ( - ) :
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 ( -) :
Check
s the value less than -7.2 kPa
-54 mmHg, -2.1 inHg)?
s there poor contact in ECM or
)ressure sensor connector?
s the voltage more than 4.5 V?
loes the voltage change more
han 4.5 V by shaking harness
ind connector of ECM while
nonitoring the value with volt-
ige meter?
s
the voltage less than 0.7
V?
s
the voltage more than 4.5 VS
Yes
20 to step
3.
3epair poor con-
act in ECM or
iressure sensor
:onnector.
30 to step 5.
'lepair poor con-
act in ECM con-
lector.
30 to step 6.
30 to step 7.
No
30
to step 2.
Even if MIL lights
~ p , the circuit has
.eturned to a nor-
nal condition at
his time.
20
to step 4.
Zontact with SOA
:distributor) ser-
{ice.
VOTE:
'nspection by DTk
s
required, be,
:ause probablc
:ause is deteriora,
:ion of multiplc
Darts.
Zontact with SOA
:distributor) ser-
dice.
VOTE:
Inspection by DThr
s required, be
zause probablt
zause is deteriora
tion of multiplt
Darts.
Repair open circuii
n harness
Detween ECM and
Dressure sensor
zonnector.
EN(D0HC TURBO)-1 11