Hombre XS Space Cab 2WD V6-4.3L (1998)
Knock Sensor: Description and Operation
Knock Sensor (KS) Sensor
The Knock Sensor (KS) system is used in order to detect the engine detonation. The VCM will retard the spark timing based on the signals from
the KS module. The Knock Sensor(s) produce an AC voltage that is sent to the KS module. The amount of the AC voltage produced is
proportional to the amount of knock.
An operating engine produces a normal amount of engine mechanical vibration (Noise). The knock sensor(s) will produce an AC voltage signal
from this Noise. When an engine is operating, the VCM will learn the minimum and maximum frequency of the noise that the engine produces.
When the VCM determines that this frequency is less than or greater than the expected amount, a knock sensor DTC will set.
