MEGAsquirt A place to collectively sort out this megasquirt gizmo
Sponsored by:
Sponsored by:

Need some help with my MS3x

 
Old 04-25-2019, 09:02 PM
  #1  
Newb
Thread Starter
 
Join Date: Apr 2019
Location: Lancaster PA
Posts: 6
Total Cats: 0
Default Need some help with my MS3x (voltage drop after power on)

Hi Guys I need some help with my MS3x diy kit.
So I followed the turbokitty completed the MS3x kit for my 99 miata.
using a 12v battery to pin28 and pin19 on dp37 to power up the MS3x and try to load the firmware. But my computer will connected to the MS3x the first 10s then I will lost the connection. So I used a voltmeter to check the 40pin connector pin 32 to 20, 19 to 20, 2 to 20, I got 5v when I first turn on , but it drop to 2.5v after 10s! How can I fix this issue?

so someone please help me here! Thank you




Last edited by Devilpou; 04-25-2019 at 09:16 PM. Reason: Try to make the title more clear.
Devilpou is offline  
Old 04-26-2019, 04:07 AM
  #2  
Senior Member
 
Join Date: Nov 2007
Location: Belgium
Posts: 983
Total Cats: 65
Default

Measure voltage on F1 and F2. These are thermal fuses, if one trips than at least you know something is pulling too much current. Check those circuits.
WestfieldMX5 is offline  
Old 04-26-2019, 09:01 AM
  #3  
Newb
Thread Starter
 
Join Date: Apr 2019
Location: Lancaster PA
Posts: 6
Total Cats: 0
Default

Good Morning, I checked the F1 and F2 this morning. I got F1 top pin stay on 5v , but when I checked the bottom bin and f2, the voltage will drop 5v to 2v.
I also checked U5, I got left pin stay on 10v, right pin stay on 5v. what should I check next?
Thank you so much for helping me
Devilpou is offline  
Old 04-28-2019, 08:42 AM
  #4  
Senior Member
 
Join Date: Nov 2007
Location: Belgium
Posts: 983
Total Cats: 65
Default

Are you saying that F1 has 5V on both sides, but F2 drops to 2V?
F2 feeds your TPS sensor. Something might be wrong with it (or its wiring).
WestfieldMX5 is offline  
Old 04-28-2019, 11:52 AM
  #5  
Newb
Thread Starter
 
Join Date: Apr 2019
Location: Lancaster PA
Posts: 6
Total Cats: 0
Default

Originally Posted by WestfieldMX5 View Post
Are you saying that F1 has 5V on both sides, but F2 drops to 2V?
F2 feeds your TPS sensor. Something might be wrong with it (or its wiring).
Thank you again, I found the issue now, I got U7 in backwards!
Devilpou is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mattruhland
MEGAsquirt
0
04-20-2019 04:08 PM


Thread Tools
Search this Thread
Quick Reply: Need some help with my MS3x


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.