Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 382

GD(H4DOTC)-280

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FN:DTC P2419 EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CON-

TROL CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the ELCM switching valve.

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)-281

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 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

Battery voltage

≥ 10.9

Terminal output voltage when ECM outputs OFF signal Low

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9

Terminal output voltage when ECM outputs OFF signal High

GD(H4DOTC)-282

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FO:DTC P2420 EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CON-

TROL CIRCUIT HIGH

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of the ELCM switching valve.

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)-283

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 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

Battery voltage

≥ 10.9

Terminal output voltage when ECM out-
puts ON signal

High

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9

Terminal output voltage when ECM out-
puts ON signal

Low