Subaru IMPREZA GD 2007 Series Manual page 1899

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AX:DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH (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)
(1) Case
(2) Weight
(3) Piezoelectric element
3. ENABLE CONDITION
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(4) (5)
(4) Nut
(5) Resistance
Enable Conditions
GD(H4DOTC)-108
(A)
EN-01707
(A) To knock sensor harness