Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 350
GD(H4DOTC)-152
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CO:DTC P0441 EVAPORATIVE EMISSION CONT. SYS. INCORRECT PURGE
FLOW
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of purge flow by the change of ELCM pressure sensor output value before/after purge
introduction.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Perform the diagnosis only once after engine start.
Secondary Parameters
Enable Conditions
<Common conditions>
Battery voltage
≥ 10.9 V
Atmospheric pressure
> 75 kPa (563 mmHg, 22.2 inHg)
<First diagnosis>
Learning value of EVAP conc. during purge
< 1
Total time of canister purge operation
≥ 120 s
<Second diagnosis>
Time after cancel of second diagnosis
≥ 60000 ms
Total time of canister purge operation
≥ 120 s
Intake manifold pressure (absolute pressure)
> 13.3 kPa (100 mmHg, 3.9 inHg)
Engine speed
≥ 0 rpm
Intake manifold pressure (relative pressure)
< 13.3 kPa (100 mmHg, 3.9 inHg)
Vehicle speed
≥ 30 km/h (18.6 MPH)
Closed air/fuel ratio control
In operation
Air fuel ratio
> 0
and
< 2
Main feedback compensation coefficient
> 0
Learning value of EVAP conc. during purge
< 1
GD(H4DOTC)-153
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
4. DIAGNOSTIC METHOD
First diagnosis
Pressure decreases when the purge is introduced compared with when the purge is not performed. By using
this, judge if the purge is correctly performed. If there is no pressure decrease, go to the second diagnosis.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 26 seconds
• Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 26 seconds
(1)
0.0045 V
(2)
2000 ms
Judgment Value
Malfunction Criteria
Threshold Value
ELCM pressure sensor output voltage when purge is not performed –
ELCM pressure sensor output voltage when purge is performed
> 0.0045 V
The accumulated time while the above conditions are met: cpfokt
< 2000 ms
Judgment Value
Malfunction Criteria
Threshold Value
ELCM pressure sensor output voltage when purge is not performed –
ELCM pressure sensor output voltage when purge is performed
> 0.0045 V
The accumulated time while the above conditions are met: cpfokt
≥ 2000 ms
EN-08947
(1)
(2)
purge duty
cpfokt measuring time
Malfunction
Malfunction
Evap. Pressure
cpfokt (timer)
OK
OK
GD(H4DOTC)-154
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Second diagnosis
Close the ELCM switching valve, and close the fuel tank completely, and perform the forced purging. If pres-
sure change amount is 0.7 kPa (5 mmHg, 0.2 inHg) or less, judge as malfunction of purge flow.
• Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 21 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.
Time Needed for Diagnosis: Less than 21 second
(1)
0.7 kPa (5 mmHg, 0.2 inHg)
Judgment Value
Malfunction Criteria
Threshold Value
ELCM pressure sensor output voltage when purge is not performed –
ELCM pressure sensor output voltage when purge is performed
< 0.7 kPa (5 mmHg,
0.2 inHg)
Time of negative pressure introduction
≥ 30000 ms
Judgment Value
Malfunction Criteria
Threshold Value
ELCM pressure sensor output voltage when purge is not performed –
ELCM pressure sensor output voltage when purge is performed
≥ 0.7 kPa (5 mmHg,
0.2 inHg)
EN-08948
(1)
purge duty
monitoring
Malfunction
OK
ON (Close)
Switching Valve
Evap. Pressure
GD(H4DOTC)-155
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CP:DTC P0451 EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/
SWITCH RANGE/PERFORMANCE
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of ELCM pressure sensor output properties.
Judge as NG when the ELCM pressure sensor output value is largely different from the intake manifold pres-
sure when the ignition switch is ON.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Perform the diagnosis once at ignition ON.
(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
Ignition switch
ON
Engine speed
< 300 rpm
Vehicle speed
< 1 km/h (0.621 MPH)
Soaking time
≥ 60 s
Variation value of intake manifold pressure (absolute
pressure) since ignition switch is turned to ON
< 1.332 kPa (9.99 mmHg, 0.39 inHg)
ELCM vacuum pump
Not in operation
ELCM switching valve
Open
Purge control
Not in operation
EN-08957
M
(10)
(8)
(6)
(5)
(2)
(3)
(4)
(1)
(7)
(9)
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