MicroSquirt.com read only forum (Jan.15,2018)

I am having serious issues setting up my trigger sensor. Overall, the setup I am using is not that usual, however the vast majority of the ignition documentation and written for VR sensors or EDIS and I cannot figure out what I am doing wrong. Here are the components:

1. A custom made 36-1 trigger wheel attached to the crankshaft. This is the only trigger; no cam wheel
2. A hall sensor purchased from DIY auto tune attached to a custom bracket less than 1 mm from the wheel and 9 teeth BTDC
3. Signal wire of sensor attaches to OPTIN+ on Pin 30
4. Ground wire of sensor attaches to OPTIN- on Pin 31
5. Voltage wire of sensor attaches to VREF on Pin 28 (I also tried attaching this straight to 12 volts. DIYAutoTune says Vref is ok)
6. I am using an ignition module similar to the Bosch 0 227 100 124, so I am using the software settings from here: http://www.megamanual.com/ms2/Bosch_124.htm

When I turn the key, absolutely nothing happens. No spark and no RPM on TunerStudio. I am following all of the directions I can find and at this point, I am assuming the sensor is bad but without an oscilloscope, I cannot test that. Am I missing something fundamental here? Using a crank wheel with crank sensor doesn't sound like it should be that difficult.

Connect a voltmeter across the Vref and ground wires, confirm you have +5v. Next, connect it across the signal and ground wires, then turn the engine as slowly as possible - if this is a bike, lift the rear wheel, put it in gear, and turn the rear wheel by hand. As each tooth and gap passes the sensor, you should see the voltage reading flip-flop: 0-5-0-5-0-5 ...

Matt Cramer - I think I've asked this before, but I can't remember the answer. The copy on your site for the Hall sensors implies there is an internal pull-up, so no external pull-up is required. Is this correct?


Edit: Is this the new V3 Microsquirt, or the older V1 or V2?

Yes, it's got an internal pull up to whatever voltage is providing power.

I've got a very similar setup, I'm using a 36-1 wheel on my crank pulley and a DIYAutoTune hall sensor, I'm using 12V power and the car frame as a ground with the output going to VR1. Don't know if this helps but it works well for me at least.

bockscar wrote: 4. Ground wire of sensor attaches to OPTIN- on Pin 31

Is that wire also connected to Battery negative? If not then it won't work. Sorry if you know this already.