Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 353
GD(H4DOTC)-164
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Mode A (Vacuum pump operation confirmation and characteristics stability)
Purpose: Detect the vacuum pump operation trouble.
Judge as NG when the following conditions are established.
Judge as OK if the following conditions are not established, and warm up for five minutes to stabilize the vac-
uum pump characteristics.
Mode B (Measurement of reference pressure for setting the target negative pressure)
1. Purpose: Judge the reference pressure stability.
Judge as NG when the following conditions are established.
2. Purpose: Judge whether the reference pressure is within the normal range, and detect the vacuum pump
and orifice malfunctions.
Judge as NG when the following conditions are established.
Mode C (Switching valve operation confirmation)
Purpose: Measure the pressure increase when switching valve is changed from open to close, and detect the
stuck to open/close malfunctions of the switching valve.
Judge as NG when the following conditions are established.
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Pressure sensor output value
> –0.2 kPa (–1.68 mmHg, –0.1 inHg)
P2404
Judgment Value
Malfunction Criteria
Threshold Value
DTC
|Pressure sensor maximum output value – Pressure sensor minimum
output value|
> 0.3 kPa (2.355 mmHg, 0.1 inHg)
P2404
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Reference pressure for setting the target negative pressure
< Value of Map 2
or
> Value of Map 3
P2404
Map 2
Atmospheric pressure
kPa (mmHg, inHg)
70 (525, 20.7)
80 (600, 23.6)
90 (675, 26.6)
100 (750, 29.5)
Reference pressure for
setting the target negative
pressure
kPa (mmHg, inHg)
–4 (–29.79, –1.2)
–4.1 (–30.593, –1.2)
–4.2 (–31.395, –1.2)
–4.3 (–32.19, –1.3)
Map 3
Atmospheric pressure
kPa (mmHg, inHg)
70 (525, 20.7)
80 (600, 23.6)
90 (675, 26.6)
100 (750, 29.5)
Reference pressure for
setting the target negative
pressure
kPa (mmHg, inHg)
–0.9 (–7.065, –0.3)
–1 (–7.86, –0.3)
–1.2 (–8.663, –0.3)
–1.3 (–9.465, –0.4)
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Pressure sensor output value – Reference pressure for setting the
target negative pressure
< 0.2 kPa (1.68 mmHg, 0.1 inHg)
P2404
GD(H4DOTC)-165
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Mode D (Clogging of pipe diagnosis and leak pressure measurement)
1.
Clogging of pipe
Purpose: Measure the time required for the evaporative emission system to reach the target negative
pressure by the vacuum pump, and detect the clogging of pipe trouble.
Judge as clogging of pipe malfunction if the evaporative emission system reaches to the target negative
pressure within the specified time.
2.
Leak pressure measurement
Purpose: Measure the pressure (leak pressure) when the evaporative emission system becomes the neg-
ative pressure by the vacuum pump.
Store the pressure as a leak pressure while the following conditions are met.
Mode E (Measurement of reference pressure for judgment)
1. Purpose: Judge the reference pressure stability.
Judge as NG when the following conditions are established.
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Time required to reach to the target negative pressure
≤ 30000 ms
P1451
For target vacuum, use one of the followings.
• Reference pressure for target vacuum setting – value of Map 4
• –5 kPa (–37.298 mmHg, –1.5 inHg)
Map 4
Time of
negative
pressure
introduction
ms
0
100000 200000 300000 400000 500000 600000 700000 800000 900000 1000000 1100000 1200000
Reference
pressure
for setting
the target
negative
pressure –
Pressure
sensor out-
put value
kPa
(mmHg,
inHg)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
0.9
(7.058,
0.3)
Judgment Value
Conditions for storing the leak pressure
Threshold Value
When any one of the followings is established:
• Reference pressure for setting the target negative pressure – Pres-
sure sensor output value
≥ Value of Map 4
• Pressure sensor output value
< –5 kPa (–37.298 mmHg, –1.5 inHg)
• Time of negative pressure introduction
≥ 900000 ms
Judgment Value
Malfunction Criteria
Threshold Value
DTC
|Pressure sensor maximum output value – Pressure sensor minimum
output value|
> 0.3 kPa (2.355 mmHg, 0.1 inHg)
P2404
GD(H4DOTC)-166
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
2. Purpose: Judge whether the reference pressure is within the normal range, and detect the vacuum pump
and orifice malfunctions. Judge the vacuum pump performance stability.
Judge as NG when the following conditions are established.
3. Purpose: Judge the presence of evaporative emission system leak.
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: Approx. 23 min
• Abnormality Judgment
At next engine start, confirm whether the enable conditions are satisfied even though refueling has been
done during soaking, and determine the malfunction.
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgment
At next engine start, confirm whether the enable conditions are satisfied even though refueling has been
done during soaking, then, if the following conditions are established, judge as OK and clear the NG.
Judgment Value
Malfunction Criteria
Threshold Value
DTC
Reference pressure for judgment
< Value of Map 5
or
> Value of Map 6
P2404
Map 5
Atmospheric pressure
kPa (mmHg, inHg)
70 (525, 20.7)
80 (600, 23.6)
90 (675, 26.6)
100 (750, 29.5)
Reference pressure for
judgment
kPa (mmHg, inHg)
–4.5 (–34.02, –1.3)
–4.6 (–34.815, –1.4)
–4.7 (–35.618, –1.4)
–4.9 (–36.42, –1.4)
Map 6
Atmospheric pressure
kPa (mmHg, inHg)
70 (525, 20.7)
80 (600, 23.6)
90 (675, 26.6)
100 (750, 29.5)
Reference pressure for
judgment
kPa (mmHg, inHg)
–0.8 (–6.18, –0.2)
–0.9 (–6.983, –0.3)
–1 (–7.785, –0.3)
–1.1 (–8.58, –0.3)
Judgment Value
Malfunction Criteria
Threshold Value
DTC
<Large leak (0.04 inch)>
P0455
Leak pressure
lleakjdg = (Reference pressure for judgment) × 0.377 – (–45.5 Pa)
≥ lleakjdg (Pa)
<Very small leak (0.02 inch)>
P0456
Leak pressure
< lleakjdg (Pa)
Judgment Value
Malfunction Criteria
Threshold Value
DTC
NG flag
Not set
P0455
P0456
P1451
P2404
GD(H4DOTC)-167
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CT:DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECT-
ED (VERY SMALL LEAK)
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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