Subaru Legacy III (2000-2003 year). Service manual — part 338
EN(H6DO)-154
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
S: 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(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
EN-00814
19
7
9
13
15
16
1
2
3
E1
B20
E13
THROTTLE
POSITION
SENSOR
E13
1 2 3
5
8
B83
B20
B135
ECM
B83
B135
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
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
1 2 3 4
5 6 7 8 9 10
11 12
19 20
13 14 15 16 17 18
EN(H6DO)-155
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(H6DO)-34, Subaru Select Moni-
tor.>
• OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
4.75 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(H6DO)-46,
Engine Control
Module.>
Replace throttle
position sensor.
<Ref. to
FU(H6DO)-33,
Throttle Position
Sensor.>
EN(H6DO)-156
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
T: DTC P0125 — INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED
LOOP FUEL CONTROL —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Engine does not return to idle.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
EN-00813
19
18
12
5
B135 ECM
2
1
E2
B21
E8
ENGINE
COOLANT
TEMPERATURE
SENSOR
E8
5
6
B83
B21
1 2
3 4
5
6 7
8
9 10
11 12
13
14 15
16
17 18
19 20
1 2
3
B83
B135
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
1 2 3 4
5 6 7 8 9 10
11 12
19 20
13 14 15 16 17 18
EN(H6DO)-157
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Another DTC is displayed.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0125.
2
CHECK TIRE SIZE.
Is the tire size the same as designated tire and
four-wheel tire?
Same.
Replace tire.
3
CHECK ENGINE COOLANT.
Check the following items.
• Engine coolant volume
• Engine coolant freezing
• Contamination in engine coolant
Is the engine coolant normal?
Normal.
Refill or replace
coolant. <Ref. to
CO(H6DO)-23,
INSPECTION,
Engine Coolant.>
4
CHECK THERMOSTAT.
Does thermostat remain open?
Remains open.
Replace thermo-
stat. <Ref. to
CO(H6DO)-25,
Thermostat.>
Replace engine
coolant tempera-
ture sensor. <Ref.
to FU(H6DO)-29,
Engine Coolant
Temperature Sen-
sor.>
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