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 Post subject: spare knock testing
PostPosted: Thu Feb 20, 2014 4:48 pm 
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Clubman

Joined: Mon Jan 04, 2010 9:07 pm
Posts: 65
Car Model: None
ive got a spare knock sensor, but im unsure if its a working spare or not
obviously without test fitting it to see if its working
(I don't really want to go to that much trouble if possible?)
is there a sure way of testing them ? Ive read that you can hear a rattle when shaken
but its not a definitive method

(this can be merged with my other code 52 post if the staff see fit)


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 Post subject: Re: spare knock testing
PostPosted: Thu Feb 20, 2014 5:08 pm 
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Club Staff
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Joined: Wed Jul 13, 2005 12:14 am
Posts: 3265
Location: Camberley, Surrey
Car Model: ST205
Seems a useful thing to know how to do if its possible. No need to merge posts :)

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 Post subject: Re: spare knock testing
PostPosted: Thu Feb 20, 2014 5:16 pm 
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Group B
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Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3679
Location: Bournemouth
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Not aware that it's posible, not electrically with a meter anyway.

In theory, place on a loudspeaker driven at the resonance frequency (6-8KHzx from memory) and measure the AC voltage out. Not actually set this up to try so unsure of the sound levels required.

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 Post subject: Re: spare knock testing
PostPosted: Thu Feb 20, 2014 11:57 pm 
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Club Staff
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Joined: Wed Jul 13, 2005 12:14 am
Posts: 3265
Location: Camberley, Surrey
Car Model: ST205
I'm now envisaging Marcus testing in something like the first scene from Back to the Future where he plugs the guitar into all those amplifiers! :D

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1996 ST205 UK


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 Post subject: Re: spare knock testing
PostPosted: Fri Feb 21, 2014 9:07 am 
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Junior WRC

Joined: Fri Jan 29, 2010 10:39 pm
Posts: 514
Location: Bournemouth
Car Model: ST205
If you have an oscilloscope, you can wire it up and set the volts/div to 500mV (or less) then tap it gently and see if you get and output..

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 Post subject: Re: spare knock testing
PostPosted: Fri Feb 21, 2014 9:07 am 
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Junior WRC

Joined: Fri Jan 29, 2010 10:39 pm
Posts: 514
Location: Bournemouth
Car Model: ST205
http://stevehackett4826.blogspot.co.uk/

(see last photo)

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 Post subject: Re: spare knock testing
PostPosted: Fri Feb 21, 2014 12:02 pm 
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Clubman

Joined: Mon Jan 04, 2010 9:07 pm
Posts: 65
Car Model: None
thanks for the detailed replys, i had looked into it before hand
and it seems its like niblettr explained and a little beyond the average DIY`er
even in the toyota repair manual, im sure its more of a swap-out part rather than test part
i think when i come to changeing mine and checking the wire, i will try the one i have
and have a new one to order on standy
in my mind its one of those parts that needs to be brand new, just to rule out its working 100%


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