Subaru IMPREZA 2002 Service Manual page 429

9
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
3epair open circu
n harness
ietween ECM and
ntake air tempera.
ure and pressure
:ensor connector.
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-II general scan tool
For detailed operation procedures, refer to the
OBD-ll General Scan Tool Instruction Manual.
CHECK POOR CONTACT.
Check poor contact in ECM and pressure sen.
sor connector.
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(8136) 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.>
CHECK HARNESS BETWEEN ECM AND IN
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 sensor and pressure sensor connec-
tor and engine ground.
Connector & terminal
(€20) No. 3 (+)
-
Engine ground (-):
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
.
Connector & terminal
(8136) No. 15 (+)
-
Chassis ground ( - ) :
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8136) No. 15 (+)
-
Chassis ground ( - ) :
Check
s the value less than 13.3 kPa
100 mmHg, 3.94 inHg)?
s there poor contact in ECM or
iressure sensor connector?
s
the voltage more than 4.5 V I
)oes the vottage 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 0.2 V?
Ioes the value change more
han 13.3 kPa (100 mmHg,
3.94 inHg) by shaking harness
2nd connector of ECM while
nonitoring the value with Sub-
iru Select Monitor?
s the voltage more than 4.5 VI
Yes
io to step 3.
Iepair poor con-
act in ECM or
wessure sensor
:onnector.
30 to step 5.
iepair poor con-
act in ECM con-
ector.
i o to step 7.
lepair poor con-
act in ECM con-
)ector.
30 to step 8.
No
i o to step 2.
Iven if MIL lights
ip, the circuit has
eturned to a nor-
nal condition at
his time.
30 to step 4.
iontact with SOA
distributor) ser-
'ice.
JOTE:
nspection by DTF
j
required, be
:ause probabl
:ause is deteriorz
ion of multipl
)arts.
$0
to step 6.
20 to step 7.
EN(SOHC)-105