D14 and D16 always on - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 01-23-2012, 05:09 PM   #1
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 84
Total Cats: 0
Default D14 and D16 always on

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...
2004GS is offline   Reply With Quote
Old 01-24-2012, 10:13 AM   #2
Supporting Vendor
 
Matt Cramer's Avatar
 
Join Date: Sep 2006
Posts: 2,266
Total Cats: 51
Default

Be sure spark output is set to going high / inverted.
Matt Cramer is offline   Reply With Quote
Old 01-24-2012, 10:28 AM   #3
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

the LEDs will appear to "look" always on. Test them back to 5v and you can see them clicking on and off rapidly.
Braineack is offline   Reply With Quote
Old 01-24-2012, 11:34 PM   #4
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2006
Location: Ontario, Canada
Posts: 84
Total Cats: 0
Default



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?
Attached Thumbnails
D14 and D16 always on-f_newdesignm_555d388.png  
2004GS is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
MS2 - Joe P Circuit alters LED behavior? ennjay MEGAsquirt 5 08-27-2015 08:23 PM
A better Spark Out circuit. Joe Perez MEGAsquirt 180 08-18-2015 10:18 AM
No Start, MS3 MS Gurus please look inside Gryff MEGAsquirt 14 09-30-2011 04:13 PM
Final Check and Parallel Harness Construction Cosmic_Eraser MEGAsquirt 18 03-17-2011 01:32 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:51 PM.