Question about 1996 Jeep Grand Cherokee
My truck say coolant sensor bad
No it does not.
it may run a test on the ECT and tell you it reads wrong, sure.
but that ONLY means the test failed, a technician
then tests it by hand , then the wires.
no ecu can tell you what part on any car is bad, ever.
it ONLY a test.
what does ECT read , in ohms cold 3000 or more? what?
then ECT read hot, 300?
if the ECT reads per the FSM chart then its good.
so the wires are bad.
i'ts that simple..
rare but possible is intermittent ECT the cause.
The PCM checks the ECT 3 ways.
3: too slow to rise. (bad engine coolant thermostat , and others) ask
so in case 3 , the ECU is not saying the ECT is bad. it dont know.
it only sees it reads wrong, and never ever knows the why.
Posted on Mar 20, 2014
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Posted on Jan 02, 2017
You'll have to look around on some of the jeep forums for exact details on how to remove the VIC, but the problem is the #8 wire in a ribbon connector that holds the two VIC circuit boards together. One is the "brain", and the other is the display, and interface.They go together in the VIC "box" like a sandwhich, with the ribbon cable in between.
The factory that made the VICs use a wave soldering method, and the #8 pin (which is the coolant sensor ground pin- IIRC it's pink- will have a cold solder joint.
It takes about 15 minutes to get the VIC out of the car, and if you can solder, another 5 to fix the problem. I'd advise re-soldering all the connections, while you're in there.
OR, buy a used VIC off of someone on E-Bay. The problem with that is they might have the same affliction.
Posted on Sep 23, 2009
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