420a Cam signal out of phase

[dsmcrzy]

Hey everyone,

I am having an issue with the cam signal into the MS3x card for my 420a powered eclipse. I am trying to convert over to a COP system but I can't get the cam signal to look correct. Its a Hall effect sensor and I set the MS3x card up as stated in the manual. The crank signal comes in through the main board using the 420a decoder also from the manual.

I am on the current released firmware for MS3 and I have uploaded a composite log. the car runs fine using the stock coil and just the crank signal. If I am missing any info please let me know.

Any one have any ideas? I have aftermarket cams so I figured I would have to tweak the magnet setting a little but this looks like its totally inverted. Also anyone know why the cam signal goes out of the viewing area? is it just my screen or what?

log pic.jpg

Here is what the 420a sequence should be.

420a sequence.png

Thank you for any help.

[dsmcrzy]

I tried searching first to see if I could figure it out. I found these 2 threads by the same person. It seems like I shouldn't be having this issue anymore and that is was fixed in 2012.

http://forums.neons.org/viewtopic.php?f=60&t=391851

http://www.msextra.com/forums/viewtopic ... 31&t=44544

thanks.

[Matt Cramer]

What firmware version are you running?

How do you have the crank and cam circuits set up?

[jsmcortina]

Also anyone know why the cam signal goes out of the viewing area? is it just my screen or what?

I've never seen that before, please start another topic in the TunerStudio section about just that issue.

James

[dsmcrzy]

James,

Will do. Thank you.

Matt,

I am running the current stable ms3 firmware, 1.3.2.

I have the crank decoder wired for the 420a just like in the manual.

http://msextra.com/doc/ms1extra/MS_Extr ... l.htm#neon

For the cam input I am using the MS3x input. I set it up for a hall sensor just like in the manual. My cam sensor has 3 wires going to it and the crank is hall sensor:


For hall or optical sensor inputs.
a) Install the jumper across JP7
b) Turn both pots (R11 and R32) 7 turns anti-clockwise (sometimes you may feel a "click" when the end position is reached, they can't be damaged by turning too far.)
c) Then turn the top one (R11) 3 turns clockwise.

[jsmcortina]

I think I see the problem, the cam circuit inverts the signal, the MS1 instructions you used do not invert the crank signal. Therefore one signal is inverted and the other is not.

James

[dsmcrzy]

James,

My apologies I grabbed the wrong link but not sure exactly if it matters... I used MS2 instructions for the v3 board:
http://msextra.com/doc/ms2extra/MS2-Extra_Neon.htm

My fault.

I am no expert here so if the MS2 one also inverts the signal is there a way to get the ms3x to invert the signal? Or am I better off redoing my crank signal?

Thank you for all the help!!

[jsmcortina]

Yes, that circuit does the same.

Two options.
1) re-do your crank circuit to match the MS3 manual. Preferred option.
Depending on how the board is built and how handy you are with a soldering iron, this can be pretty quick.
Doing it this way should make it work as designed.

2) By good fortune, I just added an option to the MS3 development firmware that allows the cam input to be flipped in software.
This firmware isn't yet released, but I could email you a copy. PM me your email address.

James

[dsmcrzy]

Thank you James!

I built the board myself so I should be able to fix it... I can follow directions very well but what would I have to switch? It's verbatim of what's in the manual.

I would prefer the second option so I will PM you now.

Thanks again!!

[jsmcortina]

I built the board myself so I should be able to fix it... I can follow directions very well but what would I have to switch? It's verbatim of what's in the manual.

You'd have to switch it to the current wiring in the current MS3 PDF manual.

James

[dsmcrzy]

James,

All I have to say is you are AMAZING!!! I loaded that firmware, switched the settings, hooked up my Audi coils and the car fired right up!! It fixed the viewing issue in TS and even inverted the signal in TS so it's all good now!!

I will post the log later tonight.

Again thank you so much!!!!

[dsmcrzy]

Here is the log. Its short but sweet!!

[Slo2g]

Any chance I can get the firmware too? I have been messaging with Matt at DIYAutotune for a while now and I think this may be my issue as well. MS3x with a 420a code running a 2.4 with aftermarket cams. I did just replace a bad cam sensor and have the same logs as whats above. I will try to dig some out of my "tuning" computer and post them up!