knock sensor L.E.D

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es - 01 Dec 2005 03:22 GMT

Hi i have a 1990 saab 9000 cd 2.0 turbo APC/DI and i was wondering what
was the easiest way to hook up a L.E.D to the knock sensor so i know
when it is knocking.

thanx

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Henrik B. - 03 Dec 2005 22:07 GMT

> Hi i have a 1990 saab 9000 cd 2.0 turbo APC/DI and i was wondering what
> was the easiest way to hook up a L.E.D to the knock sensor so i know
> when it is knocking.

I believe it's pin 17 in the APC-box, and then ground. But google it. :o)

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es - 03 Dec 2005 23:24 GMT

thanx Henrik B

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Paul Halliday - 04 Dec 2005 12:03 GMT

>> Hi i have a 1990 saab 9000 cd 2.0 turbo APC/DI and i was wondering what
>> was the easiest way to hook up a L.E.D to the knock sensor so i know
>> when it is knocking.
>
> I believe it's pin 17 in the APC-box, and then ground. But google it. :o)

Pin 19 on the later 25 pin APC boxes.

Pin 19 goes to ground (through pin 5 IIRC) when knock is detected, so the
anode side of the LED needs to be supplied with +12V, say, from the stereo
head unit's permanent live.

I'm not sure which pin it is on the older 14 pin APC units, though.

Paul

1989 900 Turbo S
http://saab.go.dyndns.org/

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