3 wire sensor connections

stevesingo

20 May 2010 19:03

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

Related to

• Forum Archive

0

• 

  Mazi

  21 May 2010 13:54

  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.

  0
• 

  stevesingo

  23 May 2010 15:36

  Thanks.

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

  Steve

  0
• 

  Mazi

  23 May 2010 17:44

  3 wire differential design is by definition less sensitive to the EMI noise.

  0
• 

  stevesingo

  23 May 2010 19:14

  Thanks.

  So the better option then?

  Steve

  0
• 

  Wolf_Tm250

  02 December 2012 18:23

  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

  0
• 

  YuriK

  03 December 2012 05:38

  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!

  0
• 

  Wolf_Tm250

  03 December 2012 07:03

  "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

  0
• 

  YuriK

  03 December 2012 22:44

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

  Regards

  0
• 

  Wolf_Tm250

  04 December 2012 08:32

  "YuriK" wrote:

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

  Regards

  Thanks a lot!

  Regards

  0
• 

  Holmz

  04 December 2012 10:03

  Wolf

  "YuriK" wrote:

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

  Regards

  But it says "OR" not 'and".
  Generally you want one side of the shield grounded and not both, to prevent ground loops. (although you may not see an issue in this case).

  0
• 

  Wolf_Tm250

  04 December 2012 10:42

  "Holmz" wrote:

  Wolf

  "YuriK" wrote:

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

  Regards

  But it says "OR" not 'and".
  Generally you want one side of the shield grounded and not both, to prevent ground loops. (although you may not see an issue in this case).

  Sure, Holmz!

  Thanks

  0

Please sign in to leave a comment.