Splitime, try this: Open MegaTune with the MS connected and the stim disconnected from the MS, go to Basic Settings -> Codebase and Output Functions and in "Wheel Decoder (eg 36-1)" choose "Off" and in "EDIS" choose "EDIS". Disconnect the MS from power and power up the MS again (to force a restart).

DO NOT CONNECT THE STIM! Use a regular 12V supply, and put a string of wire in pin 24 of the DB37 connector (this is the tach input - I suppose you have done the pullup resistor mod, yes? Don't do this if you haven't put the pullup resistors!). Now, with the other side of the wire, quickly tap onto a nearby ground several times. This should register RPMs in MegaTune.

 

alright, i'll find a 12v supply and give it a shot.

Thanks

 

I got a 9v 300mA power supply. Outputs more like 10v though. Quality radioshack stuff

No help with it inplace of the 9v battery. I'll try the suggestions from Reverent now and see. (although, ive built the MSI v3.0 to the specifications of the megasquirt build. ... not sure about the pullup resistor stuff... I'll wait until someone posts more info. Also, I don't have the specific menus that Reverent is talking of.... I've got megasquirt v2.25)

Just in case... does anyone have the info of the gentleman who's offered to trouble shoot the MS systems for an hourly rate? I'm about ready for that... I'd like to get the MS working before I get into the heavy fabrication ahead of me.

 

btw, i don't connect to ecu when its set to MSnS extras. I get errors with MSnS. With MS1 in the config I can connect and get all but RPM (at the test spot in the MS buildup just past RPM component installing).

 

Don't know if this will help you.

If your board has the miata mods the stim won't give you RPM. Only way to test it is to tap into the CAS and give it a whirl in the real world.

 

Its built to the MS build specs. I was going to go back and do the miata specific mods. Just wanted to get it up and running, then do the simple tweaks.

So... anyone know the guy that does MS troubleshooting?

 

Do you connect with MT do you get the counter in the realtime display? no tach could mean a FUBAR crystal. Next thing I'd be concerned with is the counter IC on the stim.

 

Yup, clock tics. And the things in the build prior to RPM work... just not rpm :(.

So... I've reheated joints, cleaned with acetone and whatnot....

Random Q... should the lights in the Stim be lighting up?

 

I don't have it in front of me... but I'd say yes. you won't get the IGN or INJ to light because there is no engine speed... but PMP and the other light should be doing something.

 

Hurm, I wonder if they went in backwards.... guess I'll flip them and check

... not it

 

heheh... If you don't have it figured out by the weekend I'll sit down with the schematic and see if I can figure out your problem. Has this stim been tested on a known good MS?

 

It has not... its been checked over, reheated and cleaned, the rpm pots confirmed proper and such... but beyond that... nope.

Heck, I'd be willing to ship the stim out to someone to test.... its not mine, but the gentleman who loaned me it to build for him... would probably like confirmation.

I'm going nuts at this point.... i have a ton of fabrication to do... and would love to crank it out some weekend soon and start the car up at the end of the day

 

I'd offer to help on the stim test, but I don't even know my address at the moment (living with the in-laws till we close next month).

 

updated to latest MsNS-extra and got connected. Still no RPM.

Stim shouldnt light up until MS has outputs right? So no lights at this point in testing phase.

 

I can't remember.. I'll check tonight and get back to you.

 

I just kinda skimmed over this thread, but I was having a problem reading RPM as well. Did you set any of the wheel decoder settings (ie miata is Generic Wheel)? If so, in megatune you need to go to the Spark Menu, click on Stim for Wheel, and turn it on.

 

Just set it to ON and burned it to ECU. No change. Thoughts? do i need to on/off it?

 

If you don't have the miata mod installed yet I'd turn the wheel decoder off entirely and turn that setting to off.

 

I literally have no specific miata mods. I'm around step 60 and just finished building the basic RPM stuff. Setup for Hall/optical and jumpered for it.

No outputs of any sort built.

 

What version of code do you have in the ECU? Have you tried the B&G standard code? It comes preconfigured just right for the stim.