Subaru IMPREZA 2002 Service Manual page 581

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
Yes
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-II General Scan Tool Instruction Manual.
CHECK POOR CONTACT.
Check poor contact in ECM and pressure sen-
sor connector.
-
1
-
2
3
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.
4
Connector & terminal
(6136) No. 15 (+)
-
Chassis ground (-):
nmHg, 0 inHg)?
5 CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(8136) No. 29 (+)
-
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.>
6
~
s there poor contact in ECM or
xessure sensor connector?
Repair poor con-
tact in ECM or
atmospheric pres-
sure sensor con-
s the voltage more than 4.5 V?
nector.
Go to step 5.
Ioes the voltage change more
han 4.5 V by shaking harness
ind connector of ECM while
nonitoring the value with volt-
ige meter?
Repair poor con-
tact in ECM con-
nector.
s the voltage less than 0.2 V?
No
; o
to step 2.
Go to step 7.
Iven if MIL lights
ip, the circuit has
eturned to a nor-
nal condition at
his time.
20 to step 4.
Ioes the value change more
han 0 kPa (0 mmHg, 0 inHg)
iy shaking harness and con-
lector of ECM while monitor-
ng the value with Subaru
;elect monitor?
>ontact with SOA
distributor) ser-
rice.
dOTE:
nspection by DTh
s required, be
:awe probablc
:ause is deteriora
ion of multiplc
)arts.
30 to step 6.
Repair poor con-
tact in ECM con-
nector.
30 to step 7.
EN(S0HC)-257