Subaru IMPREZA 2002 Service Manual page 454

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Yes
i o to step 7.
$0
to step 8.
Step
CHECK HARNESS BETWEEN ECM AND
TOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from throttle posi-
tion sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between throttle posi-
tion sensor connector and engine ground.
(€13) No. 4 (+)
-
Engine ground (-):
THROTTLE POSITION SENSOR CONNEC-
Connector & terminal
No
Repair harness
and connector.
NOTE:
In this case, repair
the following:
Open circuit in
harness between
throttle position
sensor and ECM
connector
Poor contact in
throttle position
sensor connector
Poor contact in
ECM connector
Poor contact in
coupling connector
(821
1
Poor contact in
joint connector
(8122)
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
ECM connector
Poor contact in
throttle position
sensor connector
Poor contact in
coupling connector
(B21)
.CHECK HARNESS BETWEEN ECM AND
THROlTLE POSITION SENSOR CONNEC-
TOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance of harness between
ECM connector and throttle position sensor
connector.
Connector & terminal
(8136) NO. 17
-
(€13) NO. 3:
CHECK HARNESS BETWEEN ECM AND
THROlTLE POSITION SENSOR CONNEC-
TOR.
Measure the resistance of harness between
throttle position sensor connector and engine
ground.
Connector & terminal
CHECK POOR CONTACT.
Check poor contact in throttle position sensor
connector.
(E13) No. 3
-
Engine ground:
Check
s the voltage more than 4.5 VS
s the resistance less than 1
3?
I
R? short circuit in har-
ness between
throttle position
sensor and ECM
connector.
s
there poor contact in throttle Repair poor con-
losition sensor connector? tact in throttle posi-
tion sensor
7
connector.
Replace the throt-
tle position sen-
sor. <Ref. to
Throttle Position
Sensor.>
FU(S0HC)-31,
EN(S0HC)-130