MS2 Zero Battery Voltage - 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 10-01-2013, 05:41 PM   #1
Newb
Thread Starter
iTrader: (1)
 
Join Date: Jun 2012
Posts: 34
Total Cats: 1
Default MS2 Zero Battery Voltage

For whatever reason, my MS2 doesn't correctly read the battery voltage. It stays at zero, even with the car running. I can get the number to change by changing the value at zero ADC count in battery calibration, but all that means is that the ADC count for battery voltage is always zero.

Does anyone have an idea what could be causing this, or how to fix it?

Thanks in advance!
MrMojo is offline   Reply With Quote
Old 10-02-2013, 03:59 AM   #2
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

Make sure R3 and R5 are installed. R3 is the likely culprit.
Reverant is offline   Reply With Quote
Old 10-02-2013, 12:50 PM   #3
Newb
Thread Starter
iTrader: (1)
 
Join Date: Jun 2012
Posts: 34
Total Cats: 1
Default

Quote:
Originally Posted by Reverant View Post
Make sure R3 and R5 are installed. R3 is the likely culprit.
They're both installed. I just checked them both with a multimeter, and they're spot on.

Also, I probably should have stated this before, but this is on a v3.0 mainboard.
MrMojo is offline   Reply With Quote
Old 10-02-2013, 02:17 PM   #4
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

New ECU? Bought used? Did it ever work properly?
Reverant is offline   Reply With Quote
Old 10-02-2013, 02:28 PM   #5
Newb
Thread Starter
iTrader: (1)
 
Join Date: Jun 2012
Posts: 34
Total Cats: 1
Default

I bought it used. It was configured for another vehicle so I'm not sure if it ever ran properly.
MrMojo is offline   Reply With Quote
Old 10-02-2013, 02:32 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,854
Total Cats: 1,788
Default

im with rev here. that's the voltage input for the MS; I'd resolder the joints and make sure the traces go back to the CPU pin as they should.
Braineack is offline   Reply With Quote
Old 10-02-2013, 02:44 PM   #7
Newb
Thread Starter
iTrader: (1)
 
Join Date: Jun 2012
Posts: 34
Total Cats: 1
Default

I'll look up the schematics and check for continuity when I get home. Thanks for the advice!
MrMojo is offline   Reply With Quote
Old 10-03-2013, 09:11 PM   #8
Newb
Thread Starter
iTrader: (1)
 
Join Date: Jun 2012
Posts: 34
Total Cats: 1
Default

Found the issue, the circuit was damaged while removing unnecessary components. Jumped it with a wire and now it runs great (or as well as an untuned megasquirt can run). Thanks again rev and brain!
MrMojo is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
No spark while cranking? navalhawkeye MEGAsquirt 9 10-07-2015 08:10 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
wiring wideband ground to battery terminal btabor ECUs and Tuning 10 09-28-2015 06:33 PM
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 11:22 AM
VE values too low? compuw22c MEGAsquirt 4 09-12-2015 08:42 PM


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 01:23 PM.