Subaru 2009 IMPREZA Service Manual page 1676

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AW: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 CONDITIONS
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(4) (5)
(3) Piezoelectric element
(4) Nut
Enable Condition
GD(H4DOTC)-88
(A)
(5) Resistance
EN-01707