Subaru Legacy 2003 Service Manual page 529

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
6 CHECK HARNESS BETWEEN ECM AND
THROTTLE POSITION SENSOR CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from throttle posi-
tion sensor.
3) Turn ignition switch to ON.
4) Measure voltage between throttle position
sensor connector and engine ground.
Connector & terminal
(E13) No. 4 (+) — Engine ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
7 CHECK HARNESS BETWEEN ECM AND
THROTTLE POSITION SENSOR CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Measure resistance of harness between
ECM connector and throttle position sensor
connector.
Connector & terminal
(B135) No. 13 — (E13) No. 3:
Is the measured value less than the speci-
fied value?
8 CHECK HARNESS BETWEEN ECM AND
THROTTLE POSITION SENSOR CONNEC-
TOR.
Measure resistance of harness between throt-
tle position sensor connector and engine
ground.
Connector & terminal
(E13) No. 3 — Engine ground:
Does the measured value exceed the specified
value?
9 CHECK POOR CONTACT.
Check poor contact in throttle position sensor
connector.
Is there poor contact in throttle position sensor
connector?
Step
EN(H4SO)-132
Value
4.5 V
1 Ω
1 MΩ
There is poor contact.
Yes
Go to step 7. 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
• Poor contact in
joint connector
Go to step 8. 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
ECM connector
• Poor contact in
throttle position
sensor connector
• Poor contact in
coupling connector
Go to step 9. Repair ground
short circuit in har-
ness between
throttle position
sensor and ECM
connector.
Repair poor con- Replace throttle
tact in throttle posi- position sensor.
tion sensor <Ref. to
connector. FU(H4SO)-30,
Throttle Position
Sensor.>
No