FLA -46
FUEL SYSTEM
KNOCK SENSOR (KS)
INSPECTION
EC4B1DA6
FUNCTION AND OPERATION PRICIPLE
Knocking is a phenomenon characterized by undesirable
vibration and noise and can cause engine damage. Knock
Sensor (KS) senses engine knocking and the two sensors
are installed inside the V-valley of the cylinder block. When
knocking occurs, the vibration from the cylinder block is
applied as pressure to the piezoelectric element. At this
time, this sensor transfers the voltage signal higher than
the specified value to the PCM and the PCM retards the
ignition timing. If the knocking disappears after retarding
the ignition timing, the PCM will advance the ignition tim-
ing. This sequential control can improve engine power,
torque and fuel economy.
Sensor
Connector
EGRF251A
Housing
Connector
Nut
Spring Washer
Load Washer
Insulator
Terminal
Piezo-electricity element
Insulator
Sleeve
EGRF252A
SPECIFICATION
Item
Specification
Capacitance (pF)
950 ~ 1,350pF