Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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
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