Freestar V6-4.2L VIN 2 (2004)
Knock Sensor: Description and Operation
KNOCK SENSOR
Two Types Of Knock Sensor (KS)
The knock sensor (KS) (Figure 41) is a tuned accelerometer on the engine which converts engine vibration to an electrical signal. The PCM uses this
signal to determine the presence of engine knock and to retard spark timing.
