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Crank pull-up
I recently got a used pre-assembled MS3X. It ran an NB1 previously. On my JimStim I can only get a crank signal if I pull up the crank signal to 5V. Is this normal? |
Yes.
Both the crank and cam sensors on the NB are of the open-collector output type. This means that they provide a closure to ground when active. As such, you must provide an external pullup voltage via a resistor (1k is typical) to their output pin in order to produce a useful signal. |
Originally Posted by Joe Perez
(Post 1513157)
Yes.
Both the crank and cam sensors on the NB are of the open-collector output type. This means that they provide a closure to ground when active. As such, you must provide an external pullup voltage via a resistor (1k is typical) to their output pin in order to produce a useful signal. The NB crank sensor doesn’t have its own pull-up from what you said. I wonder then how the PO ran their car. |
Also, what jumpers are recommended on the 3.57 board. Or rather, where should I look to find this info? MS Manual? |
https://cimg8.ibsrv.net/gimg/www.mia...579a1bd22.jpeg From the manual I’m reading that R57 needs a 1k essentially. So, just to be sure the Miata’s hall sensor on the cam doesn’t have an internal pull-up, and therefore I need R57. Adjustment of R52 and R56 doesn’t affect that I need a pull-up. Im just really confused how this board ran an NB lol. http://www.msextra.com/doc/general/t...7.html#vrlogic Miata's use a Hall sensor right? Therefore a pull-up is required.Edit - I don't have my iron on me right now, so I tried touching a 1k across two pads. Didn't work. Probably not the best way to go about it, just figured I'd try. |
Sorry for the bump, I just have a pre-assembled MS3X and trying to figure out if I need to modify anything other than the 12V flyback clamp.
Did you end up needing a 1k resistor across R57? |
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