Subaru Legacy IV (2008 year). Manual - part 444

 

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Subaru Legacy IV (2008 year). Manual - part 444

 

 

GD(H4DOTC)-226

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

EI: DTC P2419 EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CONTROL 

CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the purge control solenoid valve 2.
Judge as NG when the ECM output level differs from the actual terminal level.

2. ENABLE CONDITIONS

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

• Abnormality Judgement

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 Judgement

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

Secondary Parameters

Enable Conditions

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Terminal output voltage when ECM out-
puts OFF signal

Low

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Terminal output voltage when ECM out-
puts OFF signal

High

GD(H4DOTC)-227

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

EJ:DTC P2420 EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CONTROL 

CIRCUIT HIGH

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the purge control solenoid valve 2.
Judge as NG when the ECM output level differs from the actual terminal level.

2. ENABLE CONDITIONS

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

• Abnormality Judgement

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 Judgement

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

Secondary Parameters

Enable Conditions

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Terminal output voltage when ECM out-
puts ON signal

High

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Terminal output voltage when ECM out-
puts ON signal

Low

GD(H4DOTC)-228

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

EK:DTC P2431 SECONDARY AIR INJECTION SYSTEM AIR FLOW /PRESSURE 

SENSOR CIRCUIT RANGE/PERFORMANCE

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of secondary air pressure sensor output property.
Judge as NG when the secondary air pressure sensor output is largely different from the intake manifold
pressure at engine start.

2. ENABLE CONDITIONS

3. GENERAL DRIVING CYCLE

Perform the diagnosis with ignition switch ON.

4. DIAGNOSTIC METHOD

• Abnormality Judgement

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 Judgement

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

Secondary Parameters

Enable Conditions

Engine speed

< 300 rpm

Vehicle speed

< 1 km/h (0.6 MPH)

After secondary air system stops

t 2976 ms

Judgement Value

Malfunction Criteria

Threshold Value

|Secondary air pipe pressure – Intake 
manifold pressure|

t 26.7 kPa (200 mmHg, 
7.9 inHg)

|Intake manifold pressure at engine start 
– Intake manifold pressure|

< 1.3 kPa (9.99 mmHg, 
0.4 inHg)

Judgement Value

Malfunction Criteria

Threshold Value

|Secondary air pipe pressure – Intake 
manifold pressure|

< 26.7 kPa (200 mmHg, 
7.9 inHg)

GD(H4DOTC)-229

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

EL:DTC P2432 SECONDARY AIR INJECTION SYSTEM AIR FLOW /PRESSURE 

SENSOR CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

Judge as NG if out of specification.

2. ENABLE CONDITIONS

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

• Abnormality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

• Normality Judgement

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

Secondary Parameters

Enable Conditions

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Ignition switch

ON

Output voltage

< 0.568 V

Judgement Value

Malfunction Criteria

Threshold Value

Ignition switch

ON

Output voltage

t 0.568 V

 

 

 

 

 

 

 

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