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Low voltage injections signals problem
Posted: Mon Apr 13, 2009 5:48 pm
by Jo_Tercel99
Hi, I have a problem with my injections signals. I use Magasquirt II V3 and I assembled it myself. I asjusted all parameters for high impedence injectors and I only get 2.10 V on the injectors signals . I also tried to set it like low impedence and it give me a 3.20V signal. So, i checked everything on the board and it seem fine. So now I don't know what to do to found the problem. If you need more informations feel free to ask.
Thank you
Re: Low voltage injections signals problem
Posted: Tue Apr 14, 2009 5:45 am
by Matt Cramer
Remember that the MS supplies ground to the injectors, not power. Given how fast the injectors switch on and off, it's near impossible to catch the voltage correctly with a volt meter, requiring an oscilloscope instead. Do the injector LEDs work on a Stim?
Re: Low voltage injections signals problem
Posted: Tue Apr 14, 2009 9:36 am
by Jo_Tercel99
Oh yes thats right, so my problem is maybe somewhere else.
Yes everything seems well the LED are flashing, I don't have any problem anywhere esle but when I tried to start the car with Megasquirt it was like it was'nt injecting fuel. The fuel system is alright because I run the car every days with the stock ECU.
Re: Low voltage injections signals problem
Posted: Wed Apr 15, 2009 5:11 am
by Matt Cramer
Chances are you need to adjust the cranking pulse. But first make sure the MS is seeing RPM, since no RPM means no fuel.
Re: Low voltage injections signals problem
Posted: Wed Apr 15, 2009 5:23 am
by Jo_Tercel99
Yes I get a RPM and I tried some différent Cranking pusle and it did'nt change anything, the car didn't start, so I checked at the exhaust to see if I could smell fuel but it didn't.
Re: Low voltage injections signals problem
Posted: Wed Apr 15, 2009 6:20 am
by Matt Cramer
Check the plugs and see if they are soaked with fuel. If not, add more cranking pulse width at the temperature you're at.