Piezo Electric accelerometer??

[Scott Shotton]

I am familliar with the Piezo electric model.  It generates a frequency
and sends it to the ECM.  The ecm determines if it is a knok or not.

I'm not sure about the latter.

Scott

Shannen Durphey wrote:
> 
> Reading through a GM shop manual I found this :
> "The ESC sensor is an accelerometer or Piezo Electric
> device, mounted at the rear of the engine block...."
> 
> Am I correct in reading this to mean one or the other,
> depending on application?  The Piezo electric device acts
> like a microphone, correct?  Or can it be called an
> accelerometer, and if so, why?
> 
> Shannen