2004GS

iTrader: (1)

I noticed that when I power up the MS2 D14 and D16 are always on, I am running the improved spark output mod.

I have yet to test everything with jimstim and tunerstudio, but just wondering should these be on all the time?

This even happens when I pull the MS2 expansion card.

I looked for a short in the U1 as well as the led drive transistors. Everythign checks out fine...

Matt Cramer

Be sure spark output is set to going high / inverted.

Braineack

iTrader: (62)

the LEDs will appear to "look" always on. Test them back to 5v and you can see them clicking on and off rapidly.

2004GS

iTrader: (1)

Please confirm my understanding of the above diagram. Using D14 led drive as an example.

Cpu output not active, 0V @ Q6 base, Q6 switch off

5V @ 2N3904 base, 2N3904 switch on, D14 to ground (led glowing red)

0V potential @ 2N3904 collector, igniter coil not active.

So basically cpu signal off -> led "on" -> Coil inactive

Therefore even if the cpu is removed form the board and power is applied the led will still be active.

Is this correct?