Subaru IMPREZA 2002 Service Manual page 433

I
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:
*Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE. <Ref.
to EN(S0HC)-32, Subaru Select Monitor.>
*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
(6136) No. 15 (+)
-
Chassis ground ( - ) :
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
-
Connector & terminal
(6136) No. 15 (+)
-
Chassis ground (-):
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(6136) No. 5 (+)
-
Chassis ground (-):
CHECK INPUT SIGNAL FOR ECM. (USING
SUBARU SELECT MONITOR.)
Read the data of atmospheric absolute pres-
sure signal using Subaru Select Monitor.
NOTE:
*Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(S0HC)-32, Subaru Select Monitor.>
TAKE AIR TEMPERATURE AND PRESSURE
SENSOR CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from intake air
temperature and pressure sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between intake air tem,
perature and pressure sensor connector and
engine ground.
CHECK HARNESS BETWEEN ECM AND IN.
Connector & terminal
(E20) No. 3 (+)
-
Engine ground (-):
Check
s the value more than 11 9.5
:Pa (896.5 mmHg, 35.29
nHg)?
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 0.2 V?
Ioes the value change more
han 13.3 kPa (100 mmHg,
3.94 inHg) by shaking harries
ind connector of ECM while
nonitoring the value with Sub-
iru Select Monitor?
s the voltage more than 4.5 V'
Yes
i o to step 10.
i o to step 4.
lepair poor con-
act in ECM con-
lector.
io
to step 6.
Iepair poor con-
act in ECM con-
lector.
; o to step 7.
No
; o to step 2.
io
to step 3.
:ontact with SOA
distributor) ser-
ice.
JOTE:
nspection by DTh
s required, be
:ause probablt
:ause is deteriora
ion of multiplc
)arts.
; o
to step 5.
; o to step 6.
3epair open circui
n harness
letween ECM anc
ntake air tempera
ure and pressure
iensor connector.
EN(S0HC)-109