Pressure switch under my battery? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Pressure switch under my battery?

Rampage Bowless Soft Top Oconee offroadAlloy USA Still AvailableAdvance Adapters SYE Kits

Reply
Unread 04-23-2013, 04:38 PM   #1
a70eliminator
Registered User
 
Join Date: Dec 2004
Location: Kent Ohio
Posts: 864
Pressure switch under my battery?

I continue to reveal new oddities on my 5.9 like what is the purpose of the pressure switch under my battery, it appears to spring load open when battery is removed?

a70eliminator is offline   Reply With Quote Quick reply to this message
Unread 04-23-2013, 05:08 PM   #2
durango-bob
Registered User
2000 TJ Wrangler 
 
Join Date: Jul 2008
Location: Sioux Falls, South Dakota
Posts: 2,878
It's a temp sensor. I guess it's to prevent the battery from heating up too much when charging.
durango-bob is offline   Reply With Quote Quick reply to this message
Unread 04-23-2013, 06:46 PM   #3
coralman
new wrangler prototype
 
coralman's Avatar
1998 ZJ 
 
Join Date: Jul 2010
Location: florida
Posts: 4,537
Kinda. The switch sends a signal to the pcm which contains the voltage regulator. This signal is dependant on battery temp. Don't really know how accurate the system is cause mine sits at 14v, hot,cold,or otherwise.
__________________
deep from the bowels of mopar design

Links to axle rebuilds, mount replace,a/c box rebuild,ect in history section of my profile page
coralman is offline   Reply With Quote Quick reply to this message
Unread 04-24-2013, 06:42 AM   #4
Uniblurb
Web Wheeler
 
Uniblurb's Avatar
1996 ZJ 
 
Join Date: Jan 2012
Location: Central, Ohio
Posts: 3,677
Your voltage should be dropping down from 14V coralman after the battery warms up. Higher voltage when cold and drops gradually as it warms up. Next time you have your battery out disconnect the wiring harness to the sensor and you should be reading between 9K-11K ohms at the sensor 2-wire connection. Supposed to replace the sensor if not reading within this range. Just thought I'd pass this along.
__________________
96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)

-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
Uniblurb is online now   Reply With Quote Quick reply to this message
Unread 04-24-2013, 11:44 AM   #5
coralman
new wrangler prototype
 
coralman's Avatar
1998 ZJ 
 
Join Date: Jul 2010
Location: florida
Posts: 4,537
Will do Uni, thanks!
__________________
deep from the bowels of mopar design

Links to axle rebuilds, mount replace,a/c box rebuild,ect in history section of my profile page
coralman is offline   Reply With Quote Quick reply to this message
Unread 04-24-2013, 10:21 PM   #6
Uniblurb
Web Wheeler
 
Uniblurb's Avatar
1996 ZJ 
 
Join Date: Jan 2012
Location: Central, Ohio
Posts: 3,677
No problem coralman and good luck!
__________________
96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 93 4.0 XJ (spare), 96 4.0 XJ (son's)

-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
Uniblurb is online now   Reply With Quote Quick reply to this message
Unread 08-04-2013, 12:24 PM   #7
Rockbasses
Registered User
1998 ZJ 
 
Join Date: Jun 2013
Location: Saginaw, Mi
Posts: 11
Quote:
Originally Posted by a70eliminator View Post
I continue to reveal new oddities on my 5.9 like what is the purpose of the pressure switch under my battery, it appears to spring load open when battery is removed?
Just found mine today too! Thanks for the info from this thread. I was just wondering?!
Rockbasses is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.