Subaru Legacy IV (2008 year). Service manual — part 419
GD(H4DOTC)-126
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BN:DTC P0448 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL
CIRCUIT SHORTED
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the drain valve.
Judge as NG when the ECM output level differs from the actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(1)
Bobbin
(8)
Magnetic plate
(14)
Retainer
(2)
Coil
(9)
Shaft
(15)
Diaphragm
(3)
Diode
(10)
Plate
(16)
Movable core
(4)
Stator core
(11)
Valve
(17)
Spring
(5)
End plate
(12)
Housing
(18)
Cover
(6)
Body
(13)
Filter
(19)
O-ring
(7)
Yoke
Secondary Parameters
Enable Conditions
None
EN-02294
( 1 )
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
( 7 )
( 8 )
( 9 )
(10)
(11)
(12)
(13)
(17)
(14)
(15)
(16)
(18)
(19)
(19)
GD(H4DOTC)-127
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 as soon as a malfunction occurs.
• 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
Elapsed time after starting the engine
t 1 second
Terminal output voltage when ECM out-
puts ON signal
High
Judgement Value
Malfunction Criteria
Threshold Value
Battery voltage
t 10.9 V
Elapsed time after starting the engine
t 1 second
Terminal output voltage when ECM out-
puts ON signal
Low
GD(H4DOTC)-128
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BO:DTC P0451 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE
SENSOR
1. OUTLINE OF DIAGNOSIS
Detect the tank pressure sensor output property abnormality.
Judge as NG when there is no pressure variation, which should exist in the tank, considering the engine sta-
tus.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
• Perform the diagnosis continuously after 60 s have passed since the engine started.
• Pay attention to the fuel level and temperature.
(A)
Output voltage
(B)
Input voltage
(C)
To fuel tank
(1)
Connector
(2)
Terminals
Secondary Parameters
Enable Conditions
Elapsed time after starting the engine
t 60 s
Fuel level
t 9.6
2 (2.54 US gal,
2.11 Imp gal)
Fuel temperature
< 35 °C (95 °F)
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg,
22.2 inHg)
EN-04462
(A)
(B)
(2)
(1)
(C)
GD(H4DOTC)-129
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.
If the difference between the Max. fuel level every 60 s and Min. fuel level every 60 s is less than 2
2 (0.53
US gal, 0.44 Imp gal), extend 60 s and make judgement with the Max. and Min. values for the fuel level in 60
s × 2. 60 s If a difference does not appear, extend the time (60 s × 3, 60 s × 4, 60 s × 5) and continue the
judgement. If the difference between the Max. fuel level every 60 s and Min. fuel level every 60 s is 2
2 (0.53
US gal, 0.44 Imp gal) or more, the diagnosis counter counts up.
Time Needed for Diagnosis: 60 s × 16 time(s) or more
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
Number of times that the difference
between the Max. fuel level every 60 s
and Min. fuel level every 60 s is 2
2
(0.53 US gal, 0.44 Imp gal) or more (with
enable condition established)
t 16 time(s)
Maximum – Minimum tank pressure
(with enable condition completed)
< 0 kPa (0.375 mmHg,
0 inHg)
Maximum – Minimum fuel temperature
(with enable condition completed)
t 7 °C (44.6 °F)
Judgement Value
Malfunction Criteria
Threshold Value
Maximum — Minimum tank pressure
t 0 kPa (0.375 mmHg,
0 inHg)
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