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jetfuel07
 
  P1492 Battery Temperature Sensor Voltage Too High - Posted: 05-30-2007, 05:38 AM
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Post #1

Hello all, 1st post here but I have taken alot of your tricks and suggestions for fixing my neon before, thanks to all, but this time I can't seem to find anything about this problem.

OBDII Code P1492 - Battery Temperature Sensor Voltage Too High

Here's what happened. I changed my fan relay yesterday and when I took out the battery, which by the way is old, the positive "thingy" where you clip the positive connector almost came out. I stuffed it back in and reconnected the battery, the car started up no problem but the battery light came on. I checked the code and it was P1492. I thought it was simply time to change the battery which I did tonight, I erased the code and started the car. The battery light came on again and so did the code. I did that a few times to see if it would stop showing up but the light and code keeps coming back.

I'm just wondering what it could be and could it be damaging to anything under the hood?
My Neon's a 1998 2.0 DOHC

Thanks in advance for the suggestions.
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alaskaneon
 
 Posted: 05-30-2007, 12:46 PM
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Post #2

Put a voltmeter on it. What reading are you getting? Try unstarted but key turned as far as you can go before turning the engine over. Try a reading when engine is running.
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scottrachel01
 
 Posted: 05-30-2007, 02:29 PM
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Post #3

Do the terminals need cleaned up? Buy a good cleaner take them off and clean them real good, maybe they are not secure causing them to heat up.
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jetfuel07
 
 Posted: 05-31-2007, 03:50 AM
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Post #4

Terminals are clean, I tried the trick about starting the engine and disconnecting the negative cable to see if it's the alternator and that's fine.

Could it simply be the battery cables? I noticed on the negative, the wire's exposed a little.
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scottrachel01
 
 Posted: 05-31-2007, 06:14 AM
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Post #5

Look for anything lose or worn. When electric has resistance it heats up. Maybe try messing with the positive terminal again. You mentioned it came lose. It could also be a bad cell in the battery,not likely but we're reaching for answers.I believe the prob is in that area so keep looking.
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jetfuel07
 
 Posted: 05-31-2007, 06:27 AM
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Post #6

Yeah the positive terminal was loose, but that was the old battery, now it's a brand new one.

What about buying another sensor, how much do they go for?
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scottrachel01
 
 Posted: 05-31-2007, 06:42 AM
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Post #7

I don't know how much they are. Does it run and start ok? Take it to autozone have them put it on the computer and erase the code again and get their ideas too.
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jetfuel07
 
 Posted: 05-31-2007, 06:44 AM
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Post #8

Yeah it runs and starts fine, I just wanna make sure I don't damage anything while driving.

Thanks
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donald7150
 
 Posted: 06-02-2007, 10:06 AM
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Post #9

check to see that you didnt damage the battery tem sensor, you could easily drop the battery on it when you take it out or put it in

The sensor is used to regulate charging rate/voltage based on the ambient air temperature, and if its not working right it can mess up your charging rate, (too high or too low voltage)
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Rick99
 
 Posted: 06-02-2007, 03:10 PM
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Post #10

That error will be set by an "irrationally high" sensor reading. If the sensor is bad it could be shorted out so that it reads 5 volts (the wiring to the sensor could be shorted somewher too, so you might want to check that). I think your best bet is replacing that sensor after checking the wiring, it can't be too much at the dealer. As stated above, the battery temperature sensor is used by the PCM to determine whether the battery charging rate is proper. You could damage your new battery if you don't fix the sensor.

BTW, you should never disconnect the battery to test the alternator. While this was acceptable in the old days, modern cars have a lot of sensitive and expensive electronics that can be damaged by this (not that you weren't lucky this time). The battery absorbs a lot of the electrical "noise" created by the alternator and also moderates any voltage spikes.
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