Camshaft Signal Inverted

opel · Post by **opel** » Thu Apr 05, 2012 3:47 pm

Matt Cramer wrote:What firmware are you using?

Any particular reason you're not on release code?

Alpha 17

Flex fuel content gauge is broken in the release code.

Matt Cramer · Post by **Matt Cramer** » Fri Apr 06, 2012 4:48 am

Are you able to get it to sync with release code?

opel · Post by **opel** » Fri Apr 06, 2012 8:26 am

Matt Cramer wrote:Are you able to get it to sync with release code?

It will sync with any code. The issue is that the crank signal is inverted so the phasing is 360° crank degrees out. Firing order is supposed to be 1-3-4-2, but I have to wire it 4-2-1-3 to make the engine start. The MS thinks TDC on 1 is TDC on 4.

Why didn't moving the jumpers invert the signal?

Post by **jsmcortina** » Fri Apr 06, 2012 8:29 am

opel wrote:Why didn't moving the jumpers invert the signal?

There are 3 positions for the tach selection jumper. You've tried 2 of them. Try the third. The input signal HAS to get re-inverted that way.

James

SymTech Laboratories · Fri Apr 06, 2012 8:34 am

To clarify, try moving the jumper shunt on J1 to 5-6.

opel · Post by **opel** » Fri Apr 06, 2012 6:31 pm

SymTech Laboratories wrote:To clarify, try moving the jumper shunt on J1 to 5-6.

OK did that, crank signal looks good. Cam signal appears inverted. No RPM shows in TS. Switched ignition input capture, RPM's flash from 0 - cranking RPM rapidly. So is the camshaft signal VR or Hall? I think it is VR, isn't that the default configuration for the MS3X board? How do I go about inverting the cam signal?

opel · Post by **opel** » Sat Apr 07, 2012 10:15 am

OK - cam signal definitely inverted. Is there a quick and dirty way to invert?

opel · Post by **opel** » Thu Apr 12, 2012 12:28 pm

opel wrote:OK - cam signal definitely inverted. Is there a quick and dirty way to invert?

What about using an Op amp with a gain of -1 to invert the signal? LM324?

Post by **jsmcortina** » Thu Apr 12, 2012 12:56 pm

Hang on??? The topic started with the cam signal being inverted compared to the crank signal. You've now inverted the crank signal, so surely they should be matching up now?

James

opel · Post by **opel** » Thu Apr 12, 2012 1:09 pm

jsmcortina wrote:Hang on??? The topic started with the cam signal being inverted compared to the crank signal. You've now inverted the crank signal, so surely they should be matching up now?

James

I started with both signals inverted. The only way the engine would run is if I wired Spark A-4, B-2, C-1, D-3, this tells me that the MS3 is 360 crank degrees out of phase. (firing order is 1-3-4-2) I did not realize until later that both signals were inverted. Now I have the correct crank signal, but my cam signal is electrically inverted.

I am hoping to invert the cam signal so that it matches the diagram:

SymTech Laboratories · Thu Apr 12, 2012 1:31 pm

It's okay if both signals are inverted; you don't want one inverted and one non-inverted. The way your ECU was originally configured should have generated a non-inverted crank signal and an inverted cam signal.

Is this a standard 2.0L Neon engine, or is it a 2.4L?

opel · Post by **opel** » Thu Apr 12, 2012 2:53 pm

SymTech Laboratories wrote:It's okay if both signals are inverted; you don't want one inverted and one non-inverted. The way your ECU was originally configured should have generated a non-inverted crank signal and an inverted cam signal.

Is this a standard 2.0L Neon engine, or is it a 2.4L?

Both signals inverted causes me to wire Spark A-4, B-2, C-1, D-3, which is wrong.
this is what the composite log looks like both inverted:

This is a standard 2.0L neon engine.

Perhaps the code is 360 crank degrees out? I am trying to find ANYONE else running Neon mode with full sequential MS3 but have struck out so far.

Dstach · Post by **Dstach** » Fri Aug 29, 2014 8:19 am

Sorry to bring back such an old thread!!!! This is the only place I've found my problem. I have the exact same problem, My crank was inverted, fixed with j1 on 5 and 6. Now my cam in inverted. I however am running a 2.4 swap. How did you get this problem fixed? Again sorry for bringing it back.

dsmcrzy · Post by **dsmcrzy** » Wed Sep 03, 2014 7:14 am

Dstach wrote:Sorry to bring back such an old thread!!!! This is the only place I've found my problem. I have the exact same problem, My crank was inverted, fixed with j1 on 5 and 6. Now my cam in inverted. I however am running a 2.4 swap. How did you get this problem fixed? Again sorry for bringing it back.

I have the same problem as you but I have the 2.0l 420a. My crank signal is fine and I can run in non sequential mode. My cam signal is inverted and I have tried everything in the manual. It's hooked up to the ms3x cam input, set the pots but it's still inverted. I am running the current firmware release.

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