DIYPNP crank and cam sensor 99/00 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-26-2010, 12:11 PM   #1
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Default DIYPNP crank and cam sensor 99/00

The instructions on the DIY site don't say which two connections are the crank and the cam sensor.

http://www.diyautotune.com/diypnp/ap...0-18bp-mt.html

Any idea where the cam and crank are hooked up to the DIYPNP?
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Old 09-26-2010, 12:34 PM   #2
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Opto in - 3j
vr2 in + 3h
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Old 09-26-2010, 01:49 PM   #3
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Thanks, I finally backed in to it. Will have VVT control soon!!!
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Old 09-26-2010, 06:15 PM   #4
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What should the out put of the crank sensor look like in comparison to the cam sensor? (on a scope)
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Old 09-26-2010, 06:30 PM   #5
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Old 09-26-2010, 08:17 PM   #6
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Quote:
Originally Posted by Joe Perez View Post
Mine looks like neither. 2005 engine in a 99/00.

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Old 09-26-2010, 08:22 PM   #7
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You asked what they look like on a scope, not what they look like in TunerStudio's composite logger. When viewed on a scope, the cam and crank sensors of any 1999 through 2005 Miata look like the upper pair of traces in the image I posted.

I've never actually used TS's tooth logger, so I'm afraid I can't tell you how to interpret it.
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Old 09-26-2010, 08:29 PM   #8
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Sorry, we have been doing both and I didn't have a way to post the traces from a Textronix 466 scope. Does the image I posted look correct for a composite log? Thanks for your help.
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Old 09-27-2010, 12:59 PM   #9
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Quote:
Originally Posted by engled View Post
Does the image I posted look correct for a composite log?
Since nobody else has chimed in yet, all I can say is "I don't know."

I tried using the tooth logger once, back when I was having a misfire that I suspected (and later proved, by elimination) was caused by dropouts in my crank sensor reading. But since I have an MS1, the tooth logger proved to be pretty much useless in troubleshooting that problem owing to the MS1's inability hold more than 93 samples at a time.

So it's all Greek to me.
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Old 09-27-2010, 01:02 PM   #10
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those red lines shows it's reading signals it wasn't expecting...
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Old 09-27-2010, 01:29 PM   #11
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I'm not sure what any of the lines mean. Neither the green line nor the blue line actually depict the raw crank sensor- they're both showing evenly-spaced events, whereas neither crank nor the cam sensor are evenly spaced. The four crank teeth are arranged in two groups such that the gaps are roughly 70 - 110 - 70 - 110.

Since he's looking at the "composite logger" rather than the "tooth logger", I simply haven't a clue what's actually being shown. It bears no relation to an NB crank or cam signal that I can see.
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Old 09-27-2010, 01:30 PM   #12
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green is cam, blue is crank, red is error. you dont want red lines
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Old 09-27-2010, 01:33 PM   #13
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Quote:
Originally Posted by Braineack View Post
green is cam, blue is crank
Then something is very, very wrong.
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Old 09-27-2010, 01:36 PM   #14
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One other thing:
Quote:
Originally Posted by engled View Post
I didn't have a way to post the traces from a Textronix 466 scope.
It's actually quite easy. Point a digital camera at the screen and take a picture. Depending on your scope's persistence, sweep time and beam intensity, you may need to play with the camera's shutter speed to get a clean shot. Back in ye olde' times, there were special fixtures for doing precisely this with Polaroid cameras.
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Old 09-27-2010, 01:36 PM   #15
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yeah, the red is showing that it logged an event it wasn't expecting.
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Old 09-27-2010, 01:37 PM   #16
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I don't even mean the red. You could take that trace away and the green & blue traces would still look absolutely nothing at all like an NB's crank and cam sensor signals.

Again, I'm making assumptions here, as I don't have any first-hand knowledge of how the composite logger works, but it's certainly not display anything that, to my eyes, looks like a Miata crank/cam signal.
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Old 09-27-2010, 02:22 PM   #17
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Something is wrong. This what NB triggers look like on a composite log:
(note the similarity to Joe's scope capture)

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Old 09-27-2010, 02:23 PM   #18
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Thanks Ben, that is what I needed to see. Thanks to everyone else that offered advise as well.
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Old 09-27-2010, 02:33 PM   #19
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How are you generating the log that you posted? It's what I would expect from a B6T 4/1 CAS. Looks nothing like a Miata wave form.
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Old 09-27-2010, 03:06 PM   #20
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that's weird Ben, my '00 looks like this.
Notice my cam signal is upside down. Also each time there's a cam trigger, I get that same trigger on the crank signal. Those are not there in your traces it seems. Could you zoom in a bit further on your signal?
According to Joe's capture they shouldn't be there. The car runs fine although it does take a long time to sync (5-6 full cycles).
Any ideas what could be causing this? I'm using Joe's input circuits on a V3 board.


Last edited by WestfieldMX5; 09-27-2010 at 03:17 PM.
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