Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 351

GD(H4DOTC)-156

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: 328 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: 262 ms

Judgment Value

Malfunction Criteria

Threshold Value

|ELCM pressure sensor output value – intake manifold pressure 
(absolute pressure) when ignition switch is ON|

> 6531.7 Pa (49 mmHg, 1.9 inHg)

Judgment Value

Malfunction Criteria

Threshold Value

|ELCM pressure sensor output value – intake manifold pressure 
(absolute pressure) when ignition switch is ON|

≤ 6531.7 Pa (49 mmHg, 1.9 inHg)

GD(H4DOTC)-157

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CQ:DTC P0452 EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/

SWITCH LOW

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the ELCM pressure sensor.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(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

None

 

EN-08957

M

(10)

(8)

(6)

(5)

(2)

(3)

(4)

(1)

(7)

(9)

GD(H4DOTC)-158

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: 1000 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• 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

Output voltage

< 0.973 V

Judgment Value

Malfunction Criteria

Threshold Value

Output voltage

≥ 0.973 V

GD(H4DOTC)-159

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CR:DTC P0453 EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/

SWITCH HIGH

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the ELCM pressure sensor.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(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

None

 

EN-08957

M

(10)

(8)

(6)

(5)

(2)

(3)

(4)

(1)

(7)

(9)