Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 380

GD(H4DOTC)-272

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

4. DIAGNOSTIC METHOD

• Abnormality Judgment
Judge as NG when the following conditions are established.

Judgment Value

Time Needed for Diagnosis: 1000 engine revs.

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-

cles.

Models without SI-DRIVE

Malfunction Criteria

Threshold Value

Rich

Main feedback learning value

< –0.16

Sub feedback learning value

< –0.0124

When any one of the followings is established.

• Any one of the rich side misfire counters for each cylinder when in idling

> 8 time(s)

• Total of the rich side misfire counters for each cylinder when in idling

> 8 time(s)

• Any one of the rich side misfire counters for each cylinder when not in idling > 18 time(s)
• Total of the rich side misfire counters for each cylinder when not in idling

> 18 time(s)

Lean

Main feedback learning value

> 0.075

Sub feedback learning value

< 0

When any one of the followings is established.

• Any one of the lean side misfire counters for each cylinder when in idling

> 113 time(s)

• Total of the lean side misfire counters for each cylinder when in idling

> 65535 time(s)

• Any one of the lean side misfire counters for each cylinder when not in
idling

> 127 time(s)

• Total of the lean side misfire counters for each cylinder when not in idling

> 65535 time(s)

Models with SI-DRIVE

Malfunction Criteria

Threshold Value

Rich

Main feedback learning value

< –0.14

Sub feedback learning value

< –0.017

When any one of the followings is established.

• Any one of the rich side misfire counters for each cylinder when in idling

> 9 time(s)

• Total of the rich side misfire counters for each cylinder when in idling

> 9 time(s)

• Any one of the rich side misfire counters for each cylinder when not in idling > 20 time(s)
• Total of the rich side misfire counters for each cylinder when not in idling

> 20 time(s)

Lean

Main feedback learning value

> 0

Sub feedback learning value

< 100

When any one of the followings is established.

• Any one of the lean side misfire counters for each cylinder when in idling

> 177 time(s)

• Total of the lean side misfire counters for each cylinder when in idling

> 65535 time(s)

• Any one of the lean side misfire counters for each cylinder when not in
idling

> 192 time(s)

• Total of the lean side misfire counters for each cylinder when not in idling

> 65535 time(s)

GD(H4DOTC)-273

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

• Normality Judgment
Judge as OK and clear the NG if the following conditions are established.

Judgment Value

Time Needed for Diagnosis: 1000 engine revs.

Models without SI-DRIVE

Malfunction Criteria

Threshold Value

Rich

Main feedback learning value

≥ –0.16

or

Sub feedback learning value

≥ –0.0124

or

All of the following conditions are established.

• Any one of the rich side misfire counters for each cylinder when in idling

≤ 8 time(s)

• Total of the rich side misfire counters for each cylinder when in idling

≤ 8 time(s)

• Any one of the rich side misfire counters for each cylinder when not in idling ≤ 18 time(s)
• Total of the rich side misfire counters for each cylinder when not in idling

≤ 18 time(s)

Lean

Main feedback learning value

≤ 0.075

or

Sub feedback learning value

≥ 0

or

All of the following conditions are established.

• Any one of the lean side misfire counters for each cylinder when in idling

≤ 113 time(s)

• Total of the lean side misfire counters for each cylinder when in idling

≤ 65535 time(s)

• Any one of the lean side misfire counters for each cylinder when not in idling

≤ 127 time(s)

• Total of the lean side misfire counters for each cylinder when not in idling

≤ 65535 time(s)

Models with SI-DRIVE

Malfunction Criteria

Threshold Value

Rich

Main feedback learning value

≥ –0.14

or

Sub feedback learning value

≥ –0.017

or

All of the following conditions are established.

• Any one of the rich side misfire counters for each cylinder when in idling

≤ 9 time(s)

• Total of the rich side misfire counters for each cylinder when in idling

≤ 9 time(s)

• Any one of the rich side misfire counters for each cylinder when not in idling ≤ 20 time(s)
• Total of the rich side misfire counters for each cylinder when not in idling

≤ 20 time(s)

Lean

Main feedback learning value

≤ 0

or

Sub feedback learning value

≥ 100

or

All of the following conditions are established.

• Any one of the lean side misfire counters for each cylinder when in idling

≤ 177 time(s)

• Total of the lean side misfire counters for each cylinder when in idling

≤ 65535 time(s)

• Any one of the lean side misfire counters for each cylinder when not in idling

≤ 192 time(s)

• Total of the lean side misfire counters for each cylinder when not in idling

≤ 65535 time(s)

GD(H4DOTC)-274

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FI: DTC P2257 AIR SYSTEM CONTROL "A" CIRCUIT LOW

1. OUTLINE OF DIAGNOSIS

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 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

Secondary Parameters

Enable Conditions

None

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9 V

Ignition

ON

Terminal output voltage when ECM outputs OFF signal LOW

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9 V

Ignition

ON

Terminal output voltage when ECM outputs OFF signal HIGH

GD(H4DOTC)-275

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

FJ: DTC P2258 AIR SYSTEM CONTROL "A" CIRCUIT HIGH

1. OUTLINE OF DIAGNOSIS

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 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

Secondary Parameters

Enable Conditions

None

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9 V

Ignition

ON

Terminal output voltage when ECM outputs ON signal

HIGH

Judgment Value

Malfunction Criteria

Threshold Value

Battery voltage

≥ 10.9 V

Ignition

ON

Terminal output voltage when ECM outputs ON signal

LOW