Subaru Legacy IV (2008 year). Service manual — part 638
GD(H6DO)-172
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
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(H6DO)-173
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DJ:DTC P1443 VENT CONTROL SOLENOID VALVE FUNCTION PROBLEM
1. OUTLINE OF DIAGNOSIS
Detect the abnormal function (stuck closed) of the drain valve.
Judge as NG when fuel tank pressure is low.
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
Drain valve
Open
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg,
22.2 inHg)
Tank pressure when starter is OFF
o
ON
–0.4 kPa (–3.2 mmHg,
–0.1 inHg)
and
1.4 kPa (10.7 mmHg,
0.4 inHg)
EN-02294
( 1 )
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
( 7 )
( 8 )
( 9 )
(10)
(11)
(12)
(13)
(17)
(14)
(15)
(16)
(18)
(19)
(19)
GD(H6DO)-174
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: 3000 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
Fuel tank pressure
d –4 kPa (–30 mmHg,
–1.2 inHg)
Judgement Value
Malfunction Criteria
Threshold Value
Fuel tank pressure
> –4 kPa (–30 mmHg,
–1.2 inHg)
Cumulative time when all the malfunction
criteria below are met.
t 30000 ms
Purge control solenoid valve duty
Not = 0
Fuel temperature
–10 °C (14 °F) — 55 °C
(131 °F)
Intake manifold relative pressure
t –26.7 kPa (–200 mmHg,
–7.9 inHg)
GD(H6DO)-175
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DK:DTC P1492 EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION
(LOW INPUT)
1. OUTLINE OF DIAGNOSIS
• Detects open or short circuit of EGR.
• Judge as NG when the ECM output level differs from the actual terminal level.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously during EGR operation.
(1)
Engine control module (ECM)
(3)
Detecting circuit
(5)
Battery voltage
(2)
Computer unit (CPU)
(4)
Switch circuit
(6)
Main relay
Secondary Parameters
Enable Conditions
Elapsed time after starting the engine
t 1 second
EGR valve target position
> 0 step
Battery voltage
t 10.9 V
EN-02051
(1)
(2)
(3)
(4)
(5)
(6)
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