Subaru 2009 IMPREZA Service Manual page 1678

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)
(A) To knock sensor harness
(1) Case
(2) Weight
3. ENABLE CONDITIONS
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(4) (5)
(3) Piezoelectric element
(4) Nut
Enable Condition
GD(H4DOTC)-90
(A)
(5) Resistance
EN-01707