Subaru Legacy IV (2008 year). Service manual — part 185
GD(H4SO)-42
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Z: DTC P0126 INSUFFICIENT ENGINE COOLANT TEMPERATURE FOR STABLE
OPERATION
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of the engine coolant temperature sensor characteristics.
Memorize the engine coolant temperature and fuel temperature at the last engine stop, and use them to
judge as NG when the engine coolant temperature does not decrease when it should.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once after starting the engine.
(A)
Resistance value (k
:)
(B)
Temperature °C (°F)
(1)
Connector
(2)
Thermistor element
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Refueling from the last engine stop till
the current engine start
None
Fuel level
t 15
2 (3.96 US gal,
3.3 Imp gal)
Engine coolant temperature at the last
engine stop
t 75 °C (167 °F)
EN-02917
(A)
(2)
(1)
(B)
GD(H4SO)-43
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Engine coolant temperature at the last
engine stop — Minimum engine coolant
temperature after the engine start
< 2.5 °C (36.5 °F)
Fuel temperature at the last engine stop
— fuel temperature
t 5 °C (41 °F)
Intake air temperature — fuel temperature
< 2.5 °C (36.5 °F)
Fuel temperature
< 35 °C (95 °F)
Judgement Value
Malfunction Criteria
Threshold Value
Engine coolant temperature at the last
engine stop — Minimum engine coolant
temperature after the engine start
t 2.5 °C (36.5 °F)
GD(H4SO)-44
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AA:DTC P0128 COOLANT THERMOSTAT (ENGINE COOLANT TEMPERATURE
BELOW THERMOSTAT REGULATING TEMPERATURE)
1. OUTLINE OF DIAGNOSIS
Detect malfunctions of the thermostat function.
Judge as NG when the engine coolant temperature is lower than the estimated engine coolant temperature
and the difference between them is large. Judge as OK when the engine coolant temperature becomes to
75°C (167°F), and the difference is small, before judging NG.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(1)
Valve
(4)
Piston
(7)
Stop ring
(2)
Spring
(5)
Guide
(8)
Wax element
(3)
Stopper
(6)
Rubber seal
(9)
Jiggle valve
Secondary Parameters
Enable Conditions
None
EN-01692
(9)
(2)
(6)
(8)
(7)
(5)
(4)
(3)
(1)
(2)
GD(H4SO)-45
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis:64 ms × 3 time(s) × 152 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Estimate ambient temperature
t –7 °C (19.4 °F)
Thermostat malfunction diagnosis
Incomplete
Engine coolant temperature at engine
starting
< 55 °C (131 °F)
Estimated coolant temperature
t 75 °C (167 °F)
Engine coolant temperature
d 75 °C (167 °F)
(Estimated – Measured) Engine coolant
temperature
> 30 °C (86 °F)
Vehicle speed
t 30 km/h (18.6 MPH)
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Estimate ambient temperature
t –7 °C (19.4 °F)
Thermostat malfunction diagnosis
Incomplete
Engine coolant temperature at engine
starting
< 55 °C (131 °F)
Engine coolant temperature
t 75 °C (167 °F)
(Estimated – Measured) Engine coolant
temperature
d 30 °C (86 °F)
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