battery temp sensor error - JeepForum.com
 
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post #1 of 8 Old 08-06-2008, 10:52 PM Thread Starter
sadass
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battery temp sensor error

I have 98zj 5.9 , the check engine light came on, took jeep to advanced auto to have code read, and I was told trouble code was for a battery temp sensor fault. any have any info on trouble shooting this circuit. anyone have the same problem.

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post #2 of 8 Old 08-07-2008, 12:19 AM
5.9 ANDY
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i have never heard of a temp sensor on the battery....
im prety sure i dont have one, but i dont know now... you got me thinking...

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post #3 of 8 Old 08-07-2008, 12:28 AM
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I think it is in the battery box. It would sit under the battery, and tell the computer when it is fully charged. I have heard of it before, so i think it exists Andy, or at least on the older GC

Edit: or maybe it is on all ZJ, since you both have 98's

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post #4 of 8 Old 08-07-2008, 12:47 AM
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It's under the battery, and under the battery tray, sticking its little head up through the bottom of the tray. To get at it, remove battery, then unbolt whatever is in the way of the tray, and then unbolt the tray, and tilting it to one side, you'll see the connector under, pointing upward. Unlock the latch, then depress thumb latch, disconnect connector. Probably spray WD 40 into the latch, since no one ever goes here, it's filled with dust, and will be difficult to unlatch. So, Kroil, WD40, etc, to loosen it up before messing with the latches. It's a temperature sensor... and there isn't much to go wrong with it, except a bunch of acid, or bad connection. The sensor itself snaps out vertically from the battery tray. It's an actual sensor (a pot), and not just a switch.
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post #5 of 8 Old 08-07-2008, 12:54 AM Thread Starter
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any Idea what the purpose of that temp sensor would be? why does the jeep need to know battery temp?
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post #6 of 8 Old 08-07-2008, 02:47 AM
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i believe it's so that it can adjust the rate of charge based on temperature

UPDATE: the FSM confirms that: "...temperature data, along with data from the monitored line voltage, is used by the PCM to vary the battery charging rate." in my WJ FSM it also says that it affects the OBD systems: "Most OBD II sensors are disabled below 20 degrees." interesting!
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post #7 of 8 Old 08-07-2008, 06:52 AM
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Quote:
Originally Posted by sadass View Post
any Idea what the purpose of that temp sensor would be? why does the jeep need to know battery temp?
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Originally Posted by theksmith View Post
i believe it's so that it can adjust the rate of charge based on temperature

UPDATE: the FSM confirms that: "...temperature data, along with data from the monitored line voltage, is used by the PCM to vary the battery charging rate." in my WJ FSM it also says that it affects the OBD systems: "Most OBD II sensors are disabled below 20 degrees." interesting!
Yep that's exactly what it is for.
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post #8 of 8 Old 07-11-2010, 01:49 PM Thread Starter
sadass
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Last time was almost 2 years ago when I threw this code for Battery temp sensor error. At that time I put a new battery in because it needed it and the fault went away. Today the cel is back for Battery sensor. funny, last couple of week started to notice my battery is not holding a charge like it should, leave the tunes on in the car for any length of time and the Jeep will need a jump. I have never hear of this on JF so I thought I would follow up on this old Thread of mine for future fault related searches. Seems like my cel for battery temp sensor faulty is acting as a early battery failure warning.

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