GS 400 V8-4.0L (1UZ-FE) (1999)
Knock Sensor: Description and Operation
knock sensors are fitted one to the right bank and left bank of the cylinder block to detect engine knocking. This sensor contains a piezoelectric element
which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs,
ignition timing is retarded to suppress it.