Subaru Legacy III (2000-2003 year). Service manual — part 130
EN(H4SO)-132
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
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?
4.5 V
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
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?
1
Ω
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
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?
1 M
Ω
Repair ground
short circuit in har-
ness between
throttle position
sensor and ECM
connector.
9
CHECK POOR CONTACT.
Check poor contact in throttle position sensor
connector.
Is there poor contact in throttle position sensor
connector?
There is poor contact.
Repair poor con-
tact in throttle posi-
tion sensor
connector.
Replace throttle
position sensor.
<Ref. to
FU(H4SO)-30,
Throttle Position
Sensor.>
Step
Value
Yes
No
EN(H4SO)-133
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H4SO)-134
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
P: DTC P0123 — THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT
HIGH INPUT —
• DTC DETECTING CONDITION:
• Immediately at fault recognition
• TROUBLE SYMPTOM:
• Erroneous idling
• Engine stalls.
• Poor driving performance
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01126
19
13
3
9
11
12
2
3
4
E2
B21
E13
THROTTLE
POSITION
SENSOR
B21
1 2
3 4
5
6 7
8
9 10
11 12
13
14 15
16
17 18
19 20
B135 ECM
5 6 7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26
27 28
16 17 18 19
20 21
B135
B83
1 2 3 4 5 6
E13
1 2 3 4
B83
3
1
FG
2
4
EG
: FOR G.C.C COUNTRIES MODEL
: EXCEPT FOR G.C.C COUNTRIES MODEL
FG
EG
EN(H4SO)-135
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK CURRENT DATA.
1) Start engine.
2) Read data of throttle position sensor signal
using Subaru Select Monitor or OBD-II gen-
eral scan tool.
Does the measured value exceed the spec-
ified value?
NOTE:
•Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H4SO)-32, Subaru Select Moni-
tor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
4.9 V
Even if MI 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
2
CHECK HARNESS BETWEEN THROTTLE
POSITION SENSOR AND ECM CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from throttle position
sensor.
3) Measure resistance of harness between
throttle position sensor connector and
engine ground.
Connector & terminal
(E13) No. 2 — Engine ground:
Is the measured value less than the speci-
fied value?
5
Ω
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
coupling connector
• Poor contact in
joint connector
3
CHECK HARNESS BETWEEN THROTTLE
POSITION SENSOR AND ECM CONNEC-
TOR.
1) Turn ignition switch to ON.
2) Measure voltage between throttle position
sensor connector and engine ground.
Connector & terminal
(E13) No. 3 (+) — Engine ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
4.9 V
Repair battery
short circuit in har-
ness between
throttle position
sensor and ECM
connector. After
repair, replace
ECM. <Ref. to
FU(H4SO)-45,
Engine Control
Module.>
Replace throttle
position sensor.
<Ref. to
FU(H4SO)-30,
Throttle Position
Sensor.>
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