Subaru Legacy IV (2008 year). Service manual — part 133
EN(H4SO)(diag)-135
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Y: DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP
FUEL CONTROL
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-40, DTC P0125 INSUFFICIENT COOLANT TEMPERA-
TURE FOR CLOSED LOOP FUEL CONTROL, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Engine does not return to idle.
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
Step
Check
Yes
No
1
CHECK TIRE SIZE.
Is the tire size as specified and
the same size as three other
wheels?
Go to step 2.
Replace the tire.
2
CHECK ENGINE COOLANT.
Check the following items:
• Amount of engine coolant
• Engine coolant freeze
• Contamination of engine coolant
Is the engine coolant normal?
Go to step 3.
Fill or replace the
engine coolant.
<Ref. to
CO(H4SO)-13,
REPLACEMENT,
Engine Coolant.>
3
CHECK THERMOSTAT.
Does the thermostat remain
opened?
Replace the ther-
mostat. <Ref. to
CO(H4SO)-17,
Thermostat.>
Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO)-22,
Engine Coolant
Temperature Sen-
sor.>
EN(H4SO)(diag)-136
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Z: DTC P0126 INSUFFICIENT ENGINE COOLANT TEMPERATURE FOR STABLE
OPERATION
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-42, DTC P0126 INSUFFICIENT ENGINE COOLANT
TEMPERATURE FOR STABLE OPERATION, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Hard to start
• Improper idling
• Poor driving performance
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-04033
29
34
19
8
B134
ECM
1
2
E2
B21
E8
E8
B21
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44
45
47
46
49
48
51
50
53
52
54
B134
ENGINE
COOLANT
TEMPERATURE
SENSOR
1 2
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
33 34
29
32
30 31
EN(H4SO)(diag)-137
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK ENGINE COOLANT TEMPERATURE
SENSOR.
Measure the resistance between engine cool-
ant temperature sensor terminals when the
engine coolant is cold and after warmed up.
Terminals
No. 1 — No. 2:
Is the resistance of engine cool-
ant temperature sensor differ-
ent between when engine
coolant is cold and after
warmed up?
Repair the poor
contact of ECM
connector.
Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO)-22,
Engine Coolant
Temperature Sen-
sor.>
EN(H4SO)(diag)-138
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
AA:DTC P0128 COOLANT THERMOSTAT (ENGINE COOLANT TEMPERATURE
BELOW THERMOSTAT REGULATING TEMPERATURE)
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-44, DTC P0128 COOLANT THERMOSTAT (ENGINE
COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE), Diagnostic Trouble
Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Thermostat remains open.
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
Step
Check
Yes
No
1
CHECK ENGINE COOLANT.
Are the coolant level and mix-
ture ratio of engine coolant to
anti-freeze solution correct?
Go to step 2.
Replace the
engine coolant.
<Ref. to
CO(H4SO)-13,
REPLACEMENT,
Engine Coolant.>
2
CHECK RADIATOR FAN.
1) Start the engine.
2) Check the radiator fan operation.
Does the radiator fan continu-
ously rotate for 3 minutes or
more during idling?
Repair radiator fan
circuit. <Ref. to
CO(H4SO)-24,
Radiator Main Fan
and Fan Motor.>
and <Ref. to
CO(H4SO)-26,
Radiator Sub Fan
and Fan Motor.>
Replace the ther-
mostat. <Ref. to
CO(H4SO)-17,
Thermostat.>
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