Subaru 2009 IMPREZA Service Manual page 808

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AX:DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW (BANK 1 OR SINGLE SENSOR)
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of knock sensor.
Judge as NG if out of specification.
2. COMPONENT DESCRIPTION
(1)
(2)
(3)
(A) To knock sensor harness
(1) Case
(2) Weight
3. ENABLE CONDITION
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Output voltage
Time Needed for Diagnosis: 1000 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.
Judgement Value
Malfunction Criteria
Output voltage
Time Needed for Diagnosis: Less than 1 second
(4)
(3) Piezoelectric element
(4) Nut
Enable Condition
Threshold Value
< 0.243 V
Threshold Value
0.243 V
GD(H4SO)-84
(5)
(5) Resistance
(A)
EN-01707