Subaru IMPREZA 2002 Service Manual page 457

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK CURRENT DATA.
1)Start the engine.
2)Read the data of throttle position sensor sig-
nal 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(S0HC)-32, Subaru Select Monitor.>
*OBD-ll general scan
tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
CHECK HARNESS BETWEEN THROTTLE
POSITION SENSOR AND ECM CONNEC-
TOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from throttle posi-
tion sensor.
3)Measure the resistance of harness between
throttle position sensor connector and engine
ground.
Connector & terminal
(E 13) No. 2
-
Engine ground:
CHECK HARNESS BETWEEN THROlTLE
POSITION SENSOR AND ECM CONNEC-
TOR.
1)Turn the ignition switch to ON.
2)Measure the voltage between throttle posi-
tion sensor connector and engine ground.
(E13)
No. 3 (+)
-
Engine ground ( -):
Connector & terminal
Check
s
the value more than 4.9 V?
s the resistance less than
5
n?
Is the voltage more than 4.9 V'
Yes
i o to step 2.
20
to step 3.
3epair battery
;hort circuit in har
less between
hrottle position
sensor and ECM
:onnector. After
.epair, replace the
X M . <Ref. to
Engine Control
Module.>
'U(SOHC)-47,
No
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, repaii
the following:
Poor contact in
throttle position
sensor connector
8
Poor contact in
ECM connector
8
Poor contact in
coupling connector
(621
1
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
throttle position
sensor and ECM
connector
Poor contact in
coupling connectoi
Poor contact in
joint connector
(61 22)
Replace the throt-
tle position sen-
sor. <Ref. to
Throttle Position
Sensor.>
(821)
FU(S0HC)-31,
EN(S0HC)-133