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Unread 03-01-2008, 10:14 PM   #1
mxracer513
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2000 TJ Wrangler 
 
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Temperature Gauge

Temp gauge was acting up, working sometimes and sometimes not. Now it doesn't work at all anyway to test the sending unit? the themostat is opening fine i'm just always showin 0* on the gauge

any ideas?


thanks

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Unread 03-01-2008, 11:35 PM   #2
lmrsprt
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sending unit check the wire conection also
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Unread 03-02-2008, 08:17 AM   #3
mxracer513
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Wire connections are all tight. I ws thinking it was the sending unit, is there any other way to test other than to just buy a new one?
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Unread 03-20-2008, 11:08 PM   #4
DIZBROW
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I am having the same problem. But mine goes up to 240 about 5 min after start-up. I checked the waterpumb with a laser temp gauge and it only reads 135. It is a new sender and a new aftermarket gauge. Sender came the gauge. The stock one starting messing up when i tried to move the needle on my gas gauge. So i replaced the gas gauge and replaced temp gauge with sending unit and ran a new wire for it.
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Unread 03-21-2008, 06:10 AM   #5
Alfons
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Keep in mind that you have two senders/sensors on the YJ 4.0 liter engine. The one at the front in the thermostat housing is the sensor for the ECU and the one at the back of the block (top, drivers side, one wire attached) is for the gauge - you don't see the temperature the computer is seeing.

Both units are testable if you have a multi-meter - the resistance (ohms) changes in direct proportion to the temperature, but I don't have my manuals handy so I can't tell you what the readings should be.
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Unread 03-21-2008, 08:30 AM   #6
bamato
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Why wouldn't you replace it? I believe I bought mine at autozone for 12 dollars.... Just seems a lot easier than trying to figure out readings and such on a tester.
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Unread 03-21-2008, 12:27 PM   #7
DIZBROW
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Update just took mine out and it stays at 240 again when i hit the laser temp on it know where on the engine is over 200?
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Unread 03-23-2008, 08:53 AM   #8
DIZBROW
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Does anyone know only thing i can think of it sender....
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Unread 03-23-2008, 07:45 PM   #9
sg93yj
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on the 1993 thermistor located on top of the engine block nearest the firewall. Here are some resistance measurements you can take across it.
100 deg F = 1365 ohms
210 deg F = 115 ohms
240 deg F = 55.1 ohms

Source of info 1993 FSM
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Unread 03-24-2008, 06:57 PM   #10
laybackman
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Try grounding out the lead from the gauge. If the gauge maxes out then the gauge is good and the sender is junk.
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Unread 03-24-2008, 07:35 PM   #11
DIZBROW
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See i have always been told just to pull the wire off the sender and if it drops out the gauge is good thanks guys i will go check right now.
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Unread 03-24-2008, 07:36 PM   #12
DIZBROW
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Sorry dont know if it matters but before i put it in i checked it and it was full resistance my mutl would read 1

Last edited by DIZBROW; 03-24-2008 at 08:10 PM..
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Unread 03-24-2008, 08:11 PM   #13
DIZBROW
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ok somthin funky when i did it i had my multi meter set on 200K the i tested one why it was a -36 anf when i switched the leads it went to 1 I tried the ground out the gauge and it pegs it so i know it is not that. I think i will take it back and get another one. Does anyone know what it should read right out of the box.
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Unread 05-15-2008, 01:26 AM   #14
chaddo78
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I had a similar problem, replaced T-stat, and sending unit, reading 260 until I tap it, goes to 200-210. I'm gonna pull the guage and clean the connecter.
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