Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 343

GD(H4DOTC)-124

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BR:DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW (BANK 1 OR SINGLE SEN-

SOR)

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of knock sensor.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(A)

To knock sensor harness

(1)

Case

(3)

Piezoelectric element

(5)

Resistance

(2)

Weight

(4)

Nut

Secondary Parameters

Enable Conditions

None

EN-01707

(1)

(2)

(3)

(4)

(5)

(A)

GD(H4DOTC)-125

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: 1000 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

Output voltage

< 0.243 V

Judgment Value

Malfunction Criteria

Threshold Value

Output voltage

≥ 0.243 V

GD(H4DOTC)-126

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

BS:DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH (BANK 1 OR SINGLE SEN-

SOR)

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of knock sensor.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITIONS

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(A)

To knock sensor harness

(1)

Case

(3)

Piezoelectric element

(5)

Resistance

(2)

Weight

(4)

Nut

Secondary Parameters

Enable Conditions

None

EN-01707

(1)

(2)

(3)

(4)

(5)

(A)

GD(H4DOTC)-127

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: 1000 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

Output voltage

≥ 4.709 V

Judgment Value

Malfunction Criteria

Threshold Value

Output voltage

< 4.709 V