Subaru Legacy III (2000-2003 year). Service manual — part 131
EN(H4SO)-136
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Q: DTC P0125 — INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED
LOOP FUEL CONTROL —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Engine would not return to idling.
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-01125
19
12
9
13
B135 ECM
2
1
E2
B21
E8
ENGINE
COOLANT
TEMPERATURE
SENSOR
E8
B21
1 2
3 4
5
6 7
8
9 10
11 12
13
14 15
16
17 18
19 20
1 2
3
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
B83
3
1
FG
2
4
EG
: FOR G.C.C COUNTRIES MODEL
: EXCEPT FOR G.C.C COUNTRIES MODEL
FG
EG
EN(H4SO)-137
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?
DTC indicated.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0125.
2
CHECK THERMOSTAT.
Does thermostat remain opened?
Thermostat remains opened.
Replace thermo-
stat. <Ref. to
CO(H4SO)-21,
Thermostat.>
Replace engine
coolant tempera-
ture sensor. <Ref.
to FU(H4SO)-26,
Engine Coolant
Temperature Sen-
sor.>
EN(H4SO)-138
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
R: DTC P0129 — BAROMETRIC PRESSURE TOO LOW —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
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.> .
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Does the Subaru Select Monitor or OBD-II
general scan tool indicate DTC P0129?
DTC P0129 indicated.
Replace ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module.>
NOTE:
Atmospheric pres-
sure sensor is built
into ECM.
It is not necessary
to inspect DTC
P0129.
EN(H4SO)-139
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
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