MicroSquirt.com read only forum (Jan.15,2018)

Lance is saying that the MS2 code will have full control of the HEI7 module. The "bypass" pin will always be set so that the CPU has control. James
James and Lance, can this return code work for the PCB Rev3 boards and MSnS-E as well?If not I presuming I will still need to use the LED circuits for ...

Why didn't GM do that?
That's a good question- guess they had tons of outputs to spare? :o
I was always under the impression the engine wouldnt even start if there was a short to voltage on the bypass circuit during cranking.In fact the "CRANKS BUT WONT START" diagnostic charts in the GM manuals ...

WOT,

The original poster was asking about not using the bypass relay (or another bypass signal). If you leave 5 Volts on the bypass pin at all times, then MS-II has control over the timing, even during cranking. By having it send a 'trigger return' output to the module, you get essentially the ...

Errr I mean LED19
So the MSII is capable of controlling timing somehow during cranking then? (rpm<400)
How can this be?

The EST circuit is shunted through a resistance to ground when in Bypass mode (0V on Bypass) so any timing signal on the EST cicuit would have no affect

The only diagram I have ...

Hi Lance
Catching up on some old threads and came across this one
Why is having different code for bypass control neccessary?
(By different I mean from what MSnS-E already uses by triggering a 5V output when rpm>400- mimicing the native GM logic)
Are you trying to allow the MS to control timing ...

Didnt you just ask this in the other forum??
http://www.msefi.com/viewtopic.php?p=48 ... ght=#48907

WOT