Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 383

GD(H4DOTC)-284

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FP: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 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

Secondary Parameters

Enable Conditions

Engine speed

< 300 rpm

Vehicle speed

< 1 km/h (0.6 MPH)

After secondary air system stops

≥ 2976 ms

Judgment Value

Malfunction Criteria

Threshold Value

|Secondary air pipe pressure – Intake
manifold pressure|

≥ 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)

Judgment Value

Malfunction Criteria

Threshold Value

|Secondary air pipe pressure – Intake
manifold pressure|

< 26.7 kPa (200 mmHg, 7.9 inHg)

GD(H4DOTC)-285

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FQ: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 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: 500 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

Secondary Parameters

Enable Conditions

None

Judgment Value

Malfunction Criteria

Threshold Value

Ignition switch

ON

Output voltage

< 0.573 V

Judgment Value

Malfunction Criteria

Threshold Value

Ignition switch

ON

Output voltage

≥ 0.573 V

GD(H4DOTC)-286

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FR:DTC P2433 SECONDARY AIR INJECTION SYSTEM AIR FLOW /PRESSURE

SENSOR CIRCUIT HIGH

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 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: 500 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

Secondary Parameters

Enable Conditions

None

Judgment Value

Malfunction Criteria

Threshold Value

Ignition switch

ON

Output voltage

> 4.916 V

Judgment Value

Malfunction Criteria

Threshold Value

Ignition switch

ON

Output voltage

≤ 4.916 V

GD(H4DOTC)-287

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FS:DTC P2440 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE

STUCK OPEN (BANK1)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0410. <Ref. to GD(H4DOTC)-139, DTC P0410 SECONDARY AIR

INJECTION SYSTEM, Diagnostic Trouble Code (DTC) Detecting Criteria.>

FT:DTC P2441 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE

STUCK CLOSED (BANK1)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0410. <Ref. to GD(H4DOTC)-139, DTC P0410 SECONDARY AIR

INJECTION SYSTEM, Diagnostic Trouble Code (DTC) Detecting Criteria.>

FU:DTC P2442 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE

STUCK OPEN (BANK2)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0410. <Ref. to GD(H4DOTC)-139, DTC P0410 SECONDARY AIR

INJECTION SYSTEM, Diagnostic Trouble Code (DTC) Detecting Criteria.>

FV:DTC P2443 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE

STUCK CLOSED (BANK2)

1. OUTLINE OF DIAGNOSIS

NOTE:

For the detection standard, refer to DTC P0410. <Ref. to GD(H4DOTC)-139, DTC P0410 SECONDARY AIR

INJECTION SYSTEM, Diagnostic Trouble Code (DTC) Detecting Criteria.>