Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 365
GD(H4DOTC)-212
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
• Abnormality Judgment
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 Judgment
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
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 1 s
Terminal output voltage when ECM outputs ON signal
High
Judgment Value
Malfunction Criteria
Threshold Value
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 1 s
Terminal output voltage when ECM outputs ON signal
Low
GD(H4DOTC)-213
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DW:DTC P1449 EVAPORATIVE EMISSION CONT. SYS. AIR FILTER CLOG
1. OUTLINE OF DIAGNOSIS
Detect the drain filter clogging by the pressure change during purge introduction.
Judge as drain filter clogging malfunction if the pressure in the evaporative emission system piping suddenly
decreases by the purging.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously when purging is performed after 20000 ms have passed since the engine
started.
(1)
ELCM
(5)
Vacuum pump
(9)
Fuel tank
(2)
Switching valve
(6)
Drain filter
(10) Canister
(3)
Reference orifice (0.02 inch ori-
fice)
(7)
Purge control solenoid valve
(4)
Pressure sensor
(8)
Intake manifold
Secondary Parameters
Enable Conditions
Battery voltage
≥ 10.9 V
Elapsed time after starting the engine
≥ 20000 ms
Continuous time of |Pressure sensor output value – Pressure sensor
output value 64 ms ago| ≤ 0.7 kPa (5 mmHg, 0.2 inHg)
≥ 5120 ms + 13000 ms
Establishing time for following conditions
≥ 10000 ms
• ELCM vacuum pump
Not in operation
• ELCM switching valve
Open
EN-08957
M
(10)
(8)
(6)
(5)
(2)
(3)
(4)
(1)
(7)
(9)
GD(H4DOTC)-214
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Calculate the difference between the ELCM pressure sensor output value as of 5 seconds ago and the cur-
rent one, and if the value is greater than judgment value, detect and judge as filter clogging trouble.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: Approx. 5 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Judgment Value
Malfunction Criteria
Threshold Value
|Pressure sensor output value as of 5 seconds ago – Current pres-
sure sensor output value|
> Value from Map
Number of above conditions established
> 2 time(s)
Map
Vehicle speed
km/h (MPH)
0
(0)
20
(12.4)
40
(24.9)
60
(37.3)
80
(49.7)
100
(62.1)
120
(74.6)
300
(186.4)
|Pressure sensor output value as
of 5 seconds ago – Current pres-
sure sensor output value|
kPa (mmHg, inHg)
0.8
(5.864 ,
0.2)
0.8
(5.864 ,
0.2)
0.9
(6.757 ,
0.3)
1
(7.649 ,
0.3)
1
(7.649 ,
0.3)
1
(7.649 ,
0.3)
1
(7.649 ,
0.3)
1.6
(11.647 ,
0.5)
Judgment Value
Malfunction Criteria
Threshold Value
|Pressure sensor output value as of 5 seconds ago – Current pres-
sure sensor output value|
≤ Value from Map
EN-08951
purge duty
OK
Malfunction
Evap. Pressure
monitoring value
5 seconds
GD(H4DOTC)-215
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DX:DTC P1451 EVAPORATIVE EMISSION CONT. SYS.
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0455. <Ref. to GD(H4DOTC)-161, DTC P0455 EVAPORATIVE
EMISSION SYSTEM LEAK DETECTED (LARGE LEAK), Diagnostic Trouble Code (DTC) Detecting Crite-
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