Jeep TJ battery temp sensor - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 04-24-2012, 02:52 PM   #1
Jeeper
 
Join Date: Aug 2010
Location: NW burbs IL
Posts: 1,066
Jeep TJ battery temp sensor

I did a highline to my jeep a few months back and needed to relocate my Jeep battery to the rear of the cargo area. the problem with that was the temp sensor now had nothing to read and there fore was throwing the check engine light on. I had been asking around if anyone knew how to by-pass the sensor, No one could tell me how to do this, only cause I hadn't found anyone that has made a by-pass yet. Well if you need a by pass for that sensor I did it to my jeep and it works great!!!
This is why I like the by-pass more then the sonsor. When I'd use my winch with that sensor in place and 80 degrees out side my battery would heat up sooo much that the sensor would tell the ECM to charge the battery less(like 9Volts) when in all truth you need more charging when use'n your winch, right? so with the sensor in place I'd use my winch and it would take all day to re-charge my battery, cause the winch just drained it and my ECM was told not to charge. I my mind that doesn't make sense. so with this by-pass in place I charge at a steady 14.4v, but when I use my Winch my battery voltage doesn't drop and the battery doesn't discharge like it used to. If you'd like to know how to by-pass that sensor PM me I'l be happy to tell you more and take pictures of what I did. I also have electric fans, which draw a bit more power. needless to say the by-pass fools the ECM(so the CK engine light isn't on) and instead of a 40$ temp sensor it only costed my 70 cents.

97flexy is offline   Quote Quick Reply
Old 04-24-2012, 08:50 PM   #2
Jeeper
 
Join Date: Apr 2012
Posts: 138
temp sensor in a battery? first I have ever heard of that.

rjacobs is online now   Quote Quick Reply
Old 04-24-2012, 10:00 PM   #3
Jeeper
 
Join Date: Nov 2011
Location: Calgary, Alberta
Posts: 195
So what did you do? just cut the wire and put a toggle switch inline?
Vinman is offline   Quote Quick Reply
Old 04-24-2012, 10:15 PM   #4
Jeeper
 
Join Date: Aug 2010
Location: NW burbs IL
Posts: 1,066
the battery temp sensor is under the factory battery.
Vinman- no you do not need to cut the wire at all. you need to unplug the bad sensor and plug in a 13K resistor in place of the temp sensor, the 13K tells the ECM to charge the battery at a normal voltage where as the 20K and 30K will over charge your battery. I can take a picture if needed.
__________________
My Low Budget LCG Build
97flexy is offline   Quote Quick Reply
Old 04-25-2012, 01:47 AM   #5
Jeeper
 
Join Date: Dec 2010
Posts: 360
Images: 16
Quote:
Originally Posted by 97flexy View Post
I did a highline to my jeep a few months back and needed to relocate my Jeep battery to the rear of the cargo area. the problem with that was the temp sensor now had nothing to read and there fore was throwing the check engine light on. I had been asking around if anyone knew how to by-pass the sensor, No one could tell me how to do this, only cause I hadn't found anyone that has made a by-pass yet. Well if you need a by pass for that sensor I did it to my jeep and it works great!!!
This is why I like the by-pass more then the sonsor. When I'd use my winch with that sensor in place and 80 degrees out side my battery would heat up sooo much that the sensor would tell the ECM to charge the battery less(like 9Volts) when in all truth you need more charging when use'n your winch, right? so with the sensor in place I'd use my winch and it would take all day to re-charge my battery, cause the winch just drained it and my ECM was told not to charge. I my mind that doesn't make sense. so with this by-pass in place I charge at a steady 14.4v, but when I use my Winch my battery voltage doesn't drop and the battery doesn't discharge like it used to. If you'd like to know how to by-pass that sensor PM me I'l be happy to tell you more and take pictures of what I did. I also have electric fans, which draw a bit more power. needless to say the by-pass fools the ECM(so the CK engine light isn't on) and instead of a 40$ temp sensor it only costed my 70 cents.
Two questions:
1) if you know how to do it, and are talking about it already, why not just post it up instead of having people PM you? Just curious.... and...

2) You do realize that the temperature sensor is a safety feature, right? I understand it may be a little annoying for your battery not to charge as fast when you are pulling tons of power from it winching, but it is not safe for a battery to heat past a certain point. I'm sure the engineers had a reason for putting a temperature sensor there.
netlohcs is offline   Quote Quick Reply
Old 04-25-2012, 06:33 AM   #6
Jeeper
 
Join Date: Aug 2010
Location: NW burbs IL
Posts: 1,066
I fixed it where the solution is in my second post. and the battery should be able to take a little heat. I mean why didn't the YJ's or CJs or any other 4x4 like my old ZR2 have one, none of those trucks burned up a battery while winching, I could see it being bad if you are always winching, like you never stop. but if you need to winch for a min or two and your done thats no big deal I understand Jeep thought it was a good idea but it is not necessary, if it was such an important sensor all cars would have it.
__________________
My Low Budget LCG Build
97flexy is offline   Quote Quick Reply
Old 04-25-2012, 06:54 AM   #7
Jeeper
 
Join Date: May 2011
Location: Prosper, Tx
Posts: 163
Why wouldn't you relocate the sensor with the battery if it's that important?
bardb is offline   Quote Quick Reply
Old 04-25-2012, 06:58 AM   #8
Jeeper
 
Join Date: Aug 2010
Location: NW burbs IL
Posts: 1,066
there is no reason to relocated the sensor, its not that important, the battery will NOT over charge. the voltage regulator will not allow it to over charge.

__________________
My Low Budget LCG Build
97flexy is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

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.



Thread Tools

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 Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 03:12 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC