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Re: MS1 v2.2 No RPM
Posted: Mon Nov 07, 2011 10:54 am
by Liquid
It seems that condensator c24 may be damaged, it has changed color a bit of its side. Could it cause that "black out" or is processor simply dead?
Re: MS1 v2.2 No RPM
Posted: Mon Nov 07, 2011 11:35 am
by Matt Cramer
Liquid wrote:Matt, just confirming, i can check those voltages without processor?
Yes, you can.
Re: MS1 v2.2 No RPM
Posted: Thu Nov 10, 2011 7:59 am
by Liquid
Matt Cramer wrote:That's not a grounding problem, it's a short circuit. To check for a short in the Megasquirt PCB, power up the Megasquirt on a Stimulator or on the car and check the following points for voltage with a multimeter.
You should find the same voltage as the battery voltage on the following points: S12, S12C, the center legs of Q9 and Q12, the left (non-banded) end of D3, the left leg of U5, and the left (banded) end of D9.
You should have 5 volts at the following points: S5, the two +5V holes in the proto area, the right (non-banded) end of D9, the right leg of U5, the left (banded) end of D19, and pins 1, 20, and 31 of the CPU.
Let me know where you find the correct voltages, and where you find the wrong ones
Matt, could you send me a picture of the board and mark where to check, cause i cant see where in my board is s12, the two +5V holes in the proto area, s12c,s5 or Q12. I checked all i could, left leg of U5 shows 1-2 volts lover voltage than battery, bandes end of d9 shows same than battery, and i dont have D3 in my board, cause i heard its useless?
Non-banded end of D9 shows less than 4 volts, right leg of U5 shows 5 volts, D19 (LED?) shows 3,6 volts, and pins 1,20 and 31 show 5 volts.
Sorry for messy text
Re: MS1 v2.2 No RPM
Posted: Thu Nov 10, 2011 9:25 am
by Matt Cramer
Sorry, accidentally posted the check for V3.0s! Here's what you need on a V2.2.
You should find the same voltage as the battery voltage on the following points: the small hole to the right of the larger three holes marked X11, X12, and X13, the top (non-banded) end of D20, the left leg of U5, and the left (banded) end of D12.
You should have 5 volts at the following points: the right (non-banded) end of D12, the right leg of U5, and pins 1, 20, and 31 of the CPU.
Re: MS1 v2.2 No RPM
Posted: Thu Nov 10, 2011 12:19 pm
by Liquid
5 volts are all good, battery voltage was good for that small hole and d12, d20 and left leg of u5 was about volt lower.
Re: MS1 v2.2 No RPM
Posted: Thu Nov 10, 2011 12:51 pm
by Matt Cramer
If you put the processor back in, does the 5 volt reading drop? If so, the processor is dead.
Re: MS1 v2.2 No RPM
Posted: Thu Nov 10, 2011 9:46 pm
by Liquid
5 volts are ok with or without processor, does this mean it could work with new program?
Re: MS1 v2.2 No RPM
Posted: Fri Nov 11, 2011 5:18 am
by Liquid
YES, for the love of god, it works again
but but, that u5 still gets hot, and no rpm signal. I tried that mega+stim combination in some stoneage computer with old mega code,not extra, and it puts out warning that "not same version", BUT when i move that warning away, i can adjust rpm and stuff (not saving those ofc). Is there topic or website which shows exactly what settings must be to work with stim?
Re: MS1 v2.2 No RPM
Posted: Fri Nov 11, 2011 8:42 am
by Liquid
U5 not heating anymore, i cleaned that flux stuff from bottom.
Re: MS1 v2.2 No RPM
Posted: Sat Dec 10, 2011 9:46 am
by Liquid
Still no rpm. I just cant fiqure out what the heck is wrong. I tryed to measure voltages of that U4, and when i touch that pin 6 it "flashes" rpm, but than nothing.
Re: MS1 v2.2 No RPM
Posted: Mon Dec 12, 2011 5:22 am
by Matt Cramer
Try putting an LED test light on the output of the optoisolator and see if it blinks.
Re: MS1 v2.2 No RPM
Posted: Tue Dec 27, 2011 1:18 am
by Liquid
Hmm, i have 0 voltages of opto's pin 1, shouldnt there be 2-3 voltages? anyone have same kind of problem?
Re: MS1 v2.2 No RPM
Posted: Tue Dec 27, 2011 5:55 am
by Matt Cramer
There should be voltage on optoisolator pin 1 whenever voltage is applied to DB37 pin 24.
Re: MS1 v2.2 No RPM
Posted: Sat Dec 31, 2011 3:09 am
by Liquid
Thanks Matt. Now there is voltage on pin24, it shows 10 voltages when input is 12v, ok? And pin1 on opto shows 1,22v, pin6 shows about 0,6v. But before, i could turn-off my stimulator with that rpm f switch, but now when i put battery on stim it waits 2 secs and then its "on", but i cant shut it down with that rpm f switch. And theres still no rpm signal on megatune.
Re: MS1 v2.2 No RPM
Posted: Wed Jan 04, 2012 11:02 am
by Liquid
Listen up guys. Opto's pin1 shows 1,22v, pin2 ground, pin3 is useless, pin4 ground, pin5 0,05v and pin6 0,6v, is these ok?
http://www.bgsoflex.com/v22/megasquirt_ShemV2.2.pdf
I have checked, and i got connections just like in that pdf shows, but still no rpm signal, or blinking leds.
Re: MS1 v2.2 No RPM
Posted: Thu Jan 05, 2012 12:35 am
by Liquid
Matt, i tryed that led thing. I read those troubleshooting topics again, and i tested that if led flashes when taking voltages of D5. It should flash, but mine not, just stays on. So, i begin to imagine if that stimulators 555 unit is broke. I put resistor (4.5k) between pins 24 and 26, and then i grounded that pin 24 repeatably, and i saw rpm signal in megatune
does this mean that my mega works, and its been that stim all the time? And is there a way to test that 555 timer works?
Re: MS1 v2.2 No RPM
Posted: Thu Jan 05, 2012 5:46 am
by Matt Cramer
Yes, this is sounding like a Stim problem. Unfortunately, the Stim is tricky to test without an oscilloscope, other than by using the LED to check if the output blinks.
Re: MS1 v2.2 No RPM
Posted: Thu Jan 05, 2012 8:48 am
by Liquid
Thanks. I guess that i have to buy working 555 unit or buy/borrow another stim.
Re: MS1 v2.2 No RPM
Posted: Thu Jan 05, 2012 9:42 am
by trakkies
Liquid wrote:Thanks. I guess that i have to buy working 555 unit or buy/borrow another stim.
It can be tested - but to do so properly you need a 5 and 12v power supply - and a bit of ingenuity.
Re: MS1 v2.2 No RPM
Posted: Mon Jun 25, 2012 9:13 am
by Liquid
Hello guys! I got a little problem with ms1 v2.2. When i try my mega on computer, everything is fine, all works etc. But, i put that mega in ford sierra 2,0 ohc, and im running with distributor, so im just controlling fuel. I´ve put wire from pin 24 to coil negative, but i cant get rpm signal => fuel pump and injectors wont work. When i turn key, fuel pump is active that 2 secs, but nothing happens when im starting. D8 is active, and i got wire from XG1-X11. I wuold appreciate some help if you guys can.
Thanks.