Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 354

GD(H4DOTC)-168

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CU:DTC P0458 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE 

CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the purge control solenoid valve.

Judge as NG when the ECM output level differs from the actual terminal level.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis after starting the engine.

(A)

To canister

(B)

To intake manifold

 

 

Secondary Parameters

Enable Conditions

Battery voltage

≥ 10.9 V

Elapsed time after starting the engine

≥ 1 second

(A)

(B)

EN-02197

GD(H4DOTC)-169

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 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: Less than 1 second

Judgment Value

Malfunction Criteria

Threshold Value

Duty ratio of “ON”

< 0.75 

Terminal output voltage

Low

Judgment Value

Malfunction Criteria

Threshold Value

Terminal output voltage

High

GD(H4DOTC)-170

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CV:DTC P0459 EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE 

CIRCUIT HIGH

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the purge control solenoid valve.

Judge as NG when the ECM output level differs from the actual terminal level.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis after starting the engine.

(A)

To canister

(B)

To intake manifold

 

 

Secondary Parameters

Enable Conditions

Battery voltage

≥ 10.9 V

Elapsed time after starting the engine

≥ 1 second

(A)

(B)

EN-02197

GD(H4DOTC)-171

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 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: Less than 1 second

Judgment Value

Malfunction Criteria

Threshold Value

Duty ratio of “ON”

≥ 0.25 

Terminal output voltage

High

Judgment Value

Malfunction Criteria

Threshold Value

Terminal output voltage

Low