KNOCK SENSOR on '88-5KCSTQ

[Ti Kan]

luke writes:
> [ knock sensor ]
> havent found how to test one in the bently...
> but i know there is infinite resistance between all 3 prongs.
> im guessing when banged it opens a circuit between prongs
> 1 and 2.

The knock sensor is a piezo-electric transducer element similar to
a microphone.  However it has very high internal impedance and you
won't really be able to test it with a multimeter.  Maybe if you
have an oscilloscope with high input sensitivity and high input
impedance, you could watch for a waveform while you tap on it with
a screwdriver or something.

Be sure it's secured to the block with the correct torque.  Too loose
or too tight and it won't work right.

-Ti
2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
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