Subaru 2002 IMPREZA Service Manual page 360

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE IDIAGNOSTICS)
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. 1 (+)
-
Engine ground (-):
THROTTLE POSITION SENSOR CONNEC-
Connector & terminal
CHECK HARNESS BETWEEN ECM AND
THROTTLE 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
(8135)
NO.
7
-
(E13) NO. 3:
I
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
(E13) No. 3
-
Engine ground:
1
CHECK POOR CONTACT.
Check poor contact in throttle position sensor
connector.
Check
s the voltage more than 4.5 V'
s the resistance less than 1
2?
s the resistance less than 10
3?
s there poor contact in throttle
iosition sensor connector?
Yes
30 to step 7.
30 to step 8.
3epair ground
short circuit in har-
less between
hrottle position
sensor and ECM
:onnector.
3epair poor con-
act in throttle posi,
ion sensor
:onnector.
No
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
throttle position
sensor connector
Poor contact in
ECM connector
Poor contact in
coupling connectoi
Poor contact in
joint connector
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 connectoi
Go to step 9.
Replace the throt-
tle position sen-
sor. <Ref. to
FU(D0HC
Throttle Position
Sensor.>
TURBO)-33,
EN(D0HC TURBO)-136