Trigger wheel wiring

[monkeyboy04]

I have a 36-1 trigger wheel and the following sensor from DIYAutotune.

http://www.diyautotune.com/catalog/hall ... p-479.html

I am also running their Microsquirt 3.0 brain and harness. I have everything hooked up but I do not get a signal from the crank sensor. I am pretty sure I have it wired wrong. I have switched 12v to the red wire, and the black wire goes to sensor ground. Where and how do I wire the white wire? OPTO? VR? That part I am lost on.

Thank you for your help.

[Matt Cramer]

Connect the signal wire to VR- and leave VR+ floating.

[monkeyboy04]

OK. I have moved the wiring around like you recommended, and I have the shield of the VR grounded as well.

When I crank the engine I get a quick spike to around 250 RPM, but it quickly settles to around 25 RPM. I know that the car is not cranking that slow. It's still not reading right.

How can I troubleshoot this further? I don't know where to go from here.

I assume by leaving VR+ floating you meant don't hook it to anything? I left it unhooked.

Thank you
Jim

[dontz125]

OK. I have moved the wiring around like you recommended, and I have the shield of the VR grounded as well.

I'm looking at the wires in the pic of the sensor on DIYA's site, and I'm not seeing any shield.

Yes, 'floating' in this case means disconnected.

Matt - does this sensor need a pull-up?

[monkeyboy04]

OK. I have moved the wiring around like you recommended, and I have the shield of the VR grounded as well.

I'm looking at the wires in the pic of the sensor on DIYA's site, and I'm not seeing any shield.

Yes, 'floating' in this case means disconnected.

Matt - does this sensor need a pull-up?

The shield is on the VR wires coming from the Microsquirt brain, not the sensor. I was told it needed to be referenced to sensor ground before.