Hall effect speed sensor wiring

Hi,

I would like to use a hall effect speed sensor in my bike with an aftermarket ecu.

The sensor is from another bike and I have also attached the oem wiring file for that.

My question is that the sensor is a 12 volts so it's better to connect the ground in power ground or in sensor ground?

I would use the power ground -- if you were to have a short between power and ground, that would only fry the wire, instead of potentially damaging a ground trace in the ECU.

I think I will use a 5v Hall effect sensor instead 12v taking power from ecu 5v witch is stable voltage and use the sensor ground.

You'll be find using the power ground with a digital sensor like this. My general rule is that I'll use the power ground if the sensors take 12V power, and the sensor ground if it takes 5v power.

Many thanks both of you.

Sorry to revive an old thread, but hoping for some clarification: I'm about to wire a pair of hall effect sensors for cam and crank trigger. The sensor being used is a a ZF GS100701. It states operating voltage to be 5-24V. (data sheet here https://www.farnell.com/datasheets/2118253.pdf)

ECU being used is EMU Black.

At this point, I have wired the ecu 5V supply to the 2 sensors, and have the grounds going back to Sensor Ground on the ECU.

However reading the HPA website, there seems to be a 50:50 as to where to ground it: to sensor ground or to engine ground.

My harness is not 100% complete so I could pick it apart and change to 12V and engine ground if need be.

Hey Michael,

The way I see it is that if the Power Supply is the ECU (like the 5v+ you are using), I use the sensor ground for the return. If the power is from the Chassis (12v+) I use an engine ground.

For this ZF sensor, I usually connect them to ignition 12v+ as I use them on Nissan RB (PRP trigger kits) and it's the way that the OEM CAS is wired, but wiring them to 5v+ should be okay!

Thanks for the reply Frank. I'll go ahead and use the 5V and sensor ground as original intended.

Cheers

Mike