3 wire sensor connections

[stevesingo]

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

[Mazi]

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.

[stevesingo]

Thanks.

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

Steve

[Mazi]

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

[stevesingo]

Thanks.

So the better option then?

Steve

[Wolf_Tm250]

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

[YuriK]

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!

[Wolf_Tm250]

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

[YuriK]

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

Regards

[Wolf_Tm250]

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

Regards

Thanks a lot!

Regards