I have a 1994 sidekick with 16 valve with 5 speed. Can somebody tell me what the white wire is form? Reference voltage?
Thanks,
KJ

More specifics??  Maybe a photo.  White wires do supply voltage for ECM memory.

I don't have a picture, I can get one! It is the white wire coming out of the distributor and goes to the computer. There is a brown wire as well that goes to from the noise filter to the computer. I'm trying to get my damn megasquirt going, the ignition isnt working!
Thanks for you input. I'm still trying some configurations. It is the plug n play so I'm using the factory harness and plugs. Pain in the Ass!

I have a 1994 sidekick with 16 valve with 5 speed. Can somebody tell me what the white wire is form? Reference voltage?
Thanks,
KJ

CMP (camshaft position) sensor input.  With the key on and the signal rotor between the hall element and the magnet, there should be 3-5 volts on that wire.  With the key on and the signal rotor not between the hall element and the magnet, there should be 0-1 volts on that wire.

skyhiranger,
Thank you for the information! I will use it for my input. Do you know if I need the brown wire coming off of the noise suppression filter?

skyhiranger,
Thank you for the information! I will use it for my input. Do you know if I need the brown wire coming off of the noise suppression filter?

I think you do.  IIRC, if you unhook/unplug the noise filter on a stock 16V trackick, the engine won't start.

So do you have any idea if it is necessary on the megasquirt to trigger ignition. Im pretty(lol) sure if you unhook the noise filter you cut power to the ignition on a factory computer. You would then need to bypass it and hook the power up to coil.which looks to be the brown with yellow. I'm going to try it. Would the brown wire need power from the computer or gives power to the computer?
Where is the damn HEI? Her comes the volt meter. Thanks!!

I have no idea if you need it for a MS app.
Looking at the wiring diagrams, the ignition signal to the factory ECM comes through the noise suppressor filter.  So if the filter is unhooked, that cuts the ignition signal to the ECM.  So I believe that is why the engine won't start, in a factory configuration, if the filter is removed/unhooked.
If you want to research error code 41 (ignition signal circuit...no signal), then that may help you figure out what you need for a MS app., to get the engine to run.

It looks like the white wire is the sensor wire to the computer, it is the 5 volt to 0 and back to five when the the metal passes through the hall sensor. Is the brown the tach sensors like on the 96-98? I know the Orange is the 5 volt from computer to to igniter. I will se what is up with the brown wire tomorrow! Thanks again!

Look at the FSM for all the wire colors.... although i am not 100% positive the early years are the same... my application is a 96.  My guess is if you have the same pin locations and wire colors the FSM should be correct.

http://www.driftwoodchimes.com/zuki1018/turbo_samurai_megasquirt.html

http://www.acksfaq.com/96-FSM-v2-8A-20_pdf.htm


White is the signal "output" from the CMP in the dizzy to the ECU "Input"  ...if that helps any.  You will need to know how your MS is setup internally (switching low-to-high, or high-to-low with either a 5v or 12v reference.).

Blk/white (or Pin 7 on the dizzy plug) should be the 12v source (fused) for the internal coil
Brn/white (or Pin 6) should be the ground switching that MS needs to signal/fire the coil.

BTW those are the only 2 connections i have to run mine with MS (see pix on my page).  The 12v supply to coil and the output from MS for ignition. 

Are you trying to run using "only" the distributor hall sensor for input?  ...or does it use the crank position sensor in addition?  The reason I ask is because using only the dizzy, MS will not know which stroke your on. This is the reason I decided to use a crank mounted 36-1 missing tooth sprocket.

What does the PNP instructions tell u to hook up for spark inputs exactly?

It looks like the white wire is the sensor wire to the computer, it is the 5 volt to 0 and back to five when the the metal passes through the hall sensor. Is the brown the tach sensors like on the 96-98? I know the Orange is the 5 volt from computer to to igniter. I will se what is up with the brown wire tomorrow! Thanks again!

I was looking in a 95 FSM, for my info I posted.
Yes, it looks like the brown wire is the tach input input into the ECM.  And like I said, when the filter is unhooked, that cuts the tach input into the ECM.  So I believe that when the ECM doesn't see the tach input, it won't allow the engine to start.

Ugh... I went through enough wiring using the pre-made DIY harness.  I cannot imagine trying to sync up all the stock wires to MS.  Im not sure which one would be more of a head banger!


Have you already setup MS for 2nd trigger input?

Where did you hook up the ignition "inputs"?  ...the white/black shielded pair on the external diagram?  You would need one for each sensor correct?

I think you do.  IIRC, if you unhook/unplug the noise filter on a stock 16V trackick, the engine won't start.

It shouldn't be required on the Megasquirt - it's an ignition sense that the stock ECU uses as a "safety" - if the engine quits running, there is no signal and the ECU shuts down the fuel system to reduce the possibility of a fire - think accident here, other manufacturers use impact switches, Suzuki senses in this case ignition pulses, and on some of their other vehicles, oil pressure and/or alternator output.

It also provides a pulse to drive the tachometer, so you might want to leave it in place.

Quote from: Skyhiranger on June 24, 2012, 10:38:14 AM

I think you do.  IIRC, if you unhook/unplug the noise filter on a stock 16V trackick, the engine won't start.

It shouldn't be required on the Megasquirt - it's an ignition sense that the stock ECU uses as a "safety" - if the engine quits running, there is no signal and the ECU shuts down the fuel system to reduce the possibility of a fire - think accident here, other manufacturers use impact switches, Suzuki senses in this case ignition pulses, and on some of their other vehicles, oil pressure and/or alternator output.

It also provides a pulse to drive the tachometer, so you might want to leave it in place.

The noise filter "itself" is not required for MS... however this circuit is definitely the wire on the OUTPUT side FROM MS which needs to be wired at pin 36 (for MS1 at least) which will use to fire the coil.  And like mentioned, your factory tach will need this circuit hooked up it as-is to work.

...also im not sure "how far along" you are so for what its worth,  you need to be ensuring MS input side of things are correct if you haven't already.

In other words, if your not seeing a crank signal in the tooth/trigger logger while cranking... then your inputs are not right.