msII v3 no rpm

[squirtedtoy]

MS II V3 2.89 code

i assembled my kit all the way to the rpm section. i i selected the vr circuit originlly but had no success in getting the pots tuned for a rpm. so i read in the forum to change it over to the hall circuit so did that and no success again. as of this moment i have xg2-xg1, TSEL-OPTOOUT, TACHSELECT-OPTOIN, JS10-IGBTIN, IGBTOUT-IGN. I will enclose my msq file i dont know if i have any rpm killers or not.... any help would be appreciated as i have spent countless hours tring to check my work and re check my work.
Thanks in advance
Adam

[Matt Cramer]

No obvious RPM killers. What sort of Stim do you have?

[squirtedtoy]

i have the mega stim v2.21 i have tried the switch either way in the pnp and the npn positions and it doesnt make a difference.

[squirtedtoy]

any ideas or suggestions on how to trouble shoot my rpm issue? is there any way to check the q22 and q23 transistors? i had a hard time soldering them in the first time

[Matt Cramer]

With the Megasquirt powered up, apply 12 volts to pin 24 or TachSelect, and check the voltage on the TSEL jumper with a voltmeter. You should read zero volts. Next, ground pin 24 so it has no volts on the input circuit, and check TSEL's voltage again. You should see 5 volts there. Let me know what you find.

[squirtedtoy]

with the mega squirt powered up i have 5 volts at TSEL. when i add 12 volts to TACHSELECT nothing changes. When I ground it I still have 5 volts.

[trakkies]

If you had problems soldering Q22 &23, you're likely using solder which is too thick and or a iron bit which is too. Best solder IMHO is 0.6mm 60/40 and an iron bit of about 1mm.

Check those solder joints with a strong magnifying glass for shorts.

[squirtedtoy]

I dont have a megnifiing glass handy ill have to go to town to get one in the next day or so then inspect the solders. i started out using too large of solder and too large of a bit then i bought the right tools to do the job. those were the first ones that i tried to solder.

[Matt Cramer]

with the mega squirt powered up i have 5 volts at TSEL. when i add 12 volts to TACHSELECT nothing changes. When I ground it I still have 5 volts.

Check the voltage at both sides of R39 when you have 12 volts at TachSelect and let me know what you find.

[squirtedtoy]

i have nothing on either side of r39

[Matt Cramer]

What's in the D1 and D2 slots?

[squirtedtoy]

i didtn have anything in d1 d2 was jumpered. i looked a the instructions again and found a missing jumper in d1. would the missing jumper in d1 cause the vr circuit to not work? If it wouldnt matter if it was there or not how would i start to trouble shoot the vr circuit?

[Matt Cramer]

Well, you said you're not using the VR circuit. If D1 is empty, the Hall/optical input isn't going to work.

[squirtedtoy]

i need to use the vr circuit for its what the toyota uses. i read in the forums to change it to a hall or opitcal to see if your o2 works. down the road i might switch it to a hall sensor so it needs to work also. but for now i need the vr circuit to work.

[Matt Cramer]

So are you getting RPM from the Hall circuit yet? This one is easier to troubleshoot, and if a working Hall input circuit isn't giving you RPM, you will want to solve that before you try the VR circuit.

[squirtedtoy]

yes i am getting a rpm reading on the hall circuit now.

[Matt Cramer]

Ok. And this goes away when you switch to the VR circuit? I'd try adjusting the trim pots first.