Which pins going to the ECU should be hot with the key on? - JeepForum.com

 
LinkBack Thread Tools
post #1 of 4 Old 09-01-2011, 05:37 PM Thread Starter
AnonymousD
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2010
Location: Louisiana
Posts: 903
Which pins going to the ECU should be hot with the key on?

Im trying to track down the problem in my '92 4.0L. I tested all the pins and I get 12V on only the #3 pin. All the other pins are dead with the key on.

This is of course, with the computer out of the vehicle.

AnonymousD is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 09-01-2011, 06:01 PM
kloppk
Registered User
1992 YJ Wrangler 
 
Join Date: Oct 2006
Posts: 2,751
Pin 9 should get 12 v from the ignition switch with the key in the Run position.

Pin 3 should have 12 v on it all the time regardless of the key position.

Baystate Jeepers
Deep Woods Extreme
New England 4 Wheelers
kloppk is offline  
post #3 of 4 Old 09-01-2011, 06:07 PM Thread Starter
AnonymousD
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2010
Location: Louisiana
Posts: 903
Ok. So looks like it is probably my ignition switch then. Im getting 12V to pin 3 at all times, but nothing to pin 9 with the key on or off.

Sound about right?
AnonymousD is offline  
post #4 of 4 Old 09-01-2011, 06:12 PM
oldtime_ironman
Web Wheeler
1991 YJ Wrangler 
 
Join Date: Dec 2010
Location: 14304 Niagara Falls
Posts: 2,537
I think this link probably explains all of it. He has all that info in his write-up.

http://www.jeepforum.com/forum/f12/9...plained-490788

But yeah that would explain a lot about your ECU if only pin 3 is getting it.

.
oldtime_ironman is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
AW4 Swap into YJ, TCU 26 pins vs 32 pins? thuggles YJ Wrangler Technical Forum 0 09-14-2009 10:58 AM
need help with centering pins (again) drew2000 YJ Wrangler Technical Forum 22 07-05-2006 08:47 PM
which center pins? Johnny World YJ Wrangler Technical Forum 2 06-14-2006 04:14 PM
hinge pins tiny terror TJ Wrangler Technical Forum 6 06-07-2006 05:58 PM
gas gauge pins oil pressure gauge pins rsgweld YJ Wrangler Technical Forum 1 09-11-2005 06:44 PM

Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome