Subaru IMPREZA 2002 Service Manual page 453

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Check
Step
CHECK CURRENT DATA.
1)Start the engine.
2)Read the data of throttle position sensor sig-
nal using Subaru Select Monitor or OBD-11
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-I1 General Scan Tool Instruction Manual.
Yes
No
I
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
end chassis ground while throttle valve is fully
closed.
Connector & terminal
(6136) No. 15 (+)
-
Chassis ground (-):
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
1
Connector & terminal
(6136) No. 15 (+)
-
Chassis ground ( - ) :
s the value less than 0.1 V? IGo to step 2.
s the voltage more than 4.5 V? Go to step 4.
loes the voltage change more Repair poor con-
han 4.5 V by shaking harness tact in ECM con-
and connector of ECM while nector.
I
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8136) No. 17 (+)
-
Chassis ground ( - ) :
CHECK INPUT SIGNAL FOR ECM. (USING
SUBARU SELECT MONITOR.)
Measure the voltage between ECM connector
and chassis ground.
1
Even if MIL lights
up, the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector
may be the cause.
NOTE:
In this case, repair
the following:
Poor contact in
throttle position
sensor connector
Poor contact in
ECM connector
Poor contact in
coupling connector
Go to step 3 .
(B21)
Contact with SOA
(distributor) ser-
vice.
nonitoring the value with volt-
age meter?
s
the voltage less than 0.1 V?
9oes the voltage change more
:han 0.1 V by shaking harness
and connector of ECM while
nonitoring the value with Sub-
aru Select Monitor?
NOTE:
Inspection by DTM
is required, be.
cause probable
cause is deteriora.
tion of multiple
parts.
tact in ECM con-
nector.
EN(S0HC)-129