Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 353

 

  Index      Subaru     Subaru Impreza 3 / Impreza WRX / Impreza WRX STI - service repair manual 2008-2014 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  351  352  353  354   ..

 

 

Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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-

ria.>

 

 

 

 

 

 

 

Content   ..  351  352  353  354   ..