คำตอบที่ 14
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"Coolant Sensor Bad" FINALLY FIXED!!!!
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This is for a 96 Grand - others may be different or not.
Ok, like others I had the annoying "Coolant sensor bad" message on the vic most of the time. And the beeping while you drive - you think a door opened up or something. I've been working on fixing it for what seems like forever. First I didn't know much about the jeep and had no resources. So the coolant level sensor was replaced along with the coolant temp sensor for the PCM.
So the truth is: This message is generated by the coolant level sensor. It is directly wired to the VIC and the VIC is the only thing that uses it. So it really doesn't matter at all. It is just a dumb warning light.
Ok, so how do you fix. I'll bet most of the problems are exactly like mine, but I'll go over the easy stuff first. And Jeep should pay for it because it is a shotty manufacturing flaw. But before I reveal the secret, lets make sure your problem isn't a simple one.
Take the coolant level sensor out and unplug it. First test the sensor. Put an ohm meter accross it and when you push up on the float (as if there is plenty of coolant) it should read 3.3K ohms - or close to, mine is 3.2K. Then let the float drop and you should get closed condition (near 0 ohms).
Now put the ohm meter on the connector from the jeep. First connect it to the black wire terminal. And put the other side of your ohmmeter to a good ground (like the battery term). Should be close to 0 ohm.
Put the sensor back together and plug it in. Give a spray of contact cleaner while you are there. Under the drivers dash, there is a plastic cover near the ODBII connector. Pop it off. There is a orange and black connector that is fairly large, it has 20 wires I believe. Pull it out and find the pink with black stripe wire (same color as at the coolant sensor). Measure resistance between it and a good ground. It should be 3.3Kohm (as long as you have enough coolant in your reserve tank). Spray with contact cleaner and put back together if all is good.
Of course if any of the above is bad, fix the wiring or the sensor. But my guess is it is good. So here comes the fun part.
Tear apart the dash and remove the VIC. Look somewhere else for a dash removal inst. Basically remove the glove box and the panel around it and the panel around the VIC, with two screws behind the ash tray.
Unplug the VIC and take to the bench. Open it up (need torx bit). Get the circuit board out. On the connector - look for your pink with black stripe wire and match to the pin on the circuit board. Then look on the back and look at the solder joint. If you have a magnifying glass or good light - you'll probably see what I saw - a bad solder joint (cracked at the connector pin). Its neighbors may be bad also. Use a soldering iron and reflow with a little new solder. Do the others while you are in there. Put everything back together and enjoy beep-free driving.
Now I get to go rub it into the stealership - since they had no clue what the message even meant. I thought they would know how to fix it - yeah right. If you want it done, you gotta do it yourself.
