3 wire sensor connections

SKM and OKM

3 wire sensor connections

Postby stevesingo on Fri May 21, 2010 5:03 am

I have a Bosch Knock sensor 0 261 231 047 which has 3 wires.

Pin 1 Sig +
Pin 2 Sig -
Pin 3 Shield.

Can this be connected to an SKM? I was thinking of either wiring the shield and Sig - together or connecting the Sig - to the ECU sensor 0v.

Any suggestions?

Thanks

Steve
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Re: 3 wire sensor connections

Postby Mazi on Fri May 21, 2010 11:54 pm

Sensor Pin 1 Sig+ --> Sensor 1 input SKM Pin 6
Sensor Pin 2 Sig- --> Sensor 3 input SKM Pin 8
Sensor Shield Pin 3 --> SKM sensor shield Pin 10

DM switch must be ON for Differential mode.
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Re: 3 wire sensor connections

Postby stevesingo on Mon May 24, 2010 1:36 am

Thanks.

Any Pros/Cons of 2 wire vs 3 wire sensors?

Steve
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Re: 3 wire sensor connections

Postby Mazi on Mon May 24, 2010 3:44 am

3 wire differential design is by definition less sensitive to the EMI noise.
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Re: 3 wire sensor connections

Postby stevesingo on Mon May 24, 2010 5:14 am

Thanks.

So the better option then?

Steve
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Re: 3 wire sensor connections

Postby Wolf_Tm250 on Mon Dec 03, 2012 4:23 am

Hi,
I'm trying to connect a 2 wires Bosch 0-261-231-006 ks, but SKM manual is not so clear.
I was told by the seller that the 2 wires are Sig+ & Sig-, as the shield is only in the cable, so does this mean it is a differential sensor too and have to connect the 2 wires to SKM input 1 and 3, or it is just Sig+ and ground?

Thanks in advance
Wolf_Tm
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Parma - Italy
http://www.youtube.com/user/WolfTm250
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Re: 3 wire sensor connections

Postby YuriK on Mon Dec 03, 2012 3:38 pm

Hi,
You need to wire the sensor exactly as it is shown in the SKM manual Signal goes into SKM pin 6 and 0V (or Sig-) goes into SKM pin 10.
BTW I checked come 3 wires Bosch knock sensors and they all seem to be just two wires and shield sensors, didn't see any truly differential knock sensors.

Regards!
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Re: 3 wire sensor connections

Postby Wolf_Tm250 on Mon Dec 03, 2012 5:03 pm

YuriK wrote:Hi,
You need to wire the sensor exactly as it is shown in the SKM manual Signal goes into SKM pin 6 and 0V (or Sig-) goes into SKM pin 10.

Regards!


Yuri,
as you can see in the manual, Pin 10 is "black/shield" and not "knock sensor ground", that's why I was unsure.
So if I wire 0v to Pion 10, where to wire cable shield?
Thanks in advance.

Wolf
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Re: 3 wire sensor connections

Postby YuriK on Tue Dec 04, 2012 8:44 am

Hi Wolf,
You can wire the sield to pin 13 or put it on chassi ground

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Re: 3 wire sensor connections

Postby Wolf_Tm250 on Tue Dec 04, 2012 6:32 pm

YuriK wrote:Hi Wolf,
You can wire the sield to pin 13 or put it on chassi ground

Regards



Thanks a lot!

Regards
Wolf_Tm
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