For testing... Coolant Sensor can be replaced with a 3.3KΩ resistor. If the message is still there, then likely VIC solder joint(s). Fractured solder joints may not be easy to see, even with a magnifier.
I found several fractured solder joints, the main ground pin solder was worst. I resoldered every pin in both rows.
For my '97 GC, phild328 was on the money. I followed his directions and sure enough, found bad soldering in several connections including the one for the coolant sensor in the overflow tank. Checked the resistance at the places noted before taking out the VIC. A few cents worth of solder and about an hour of work and it's fixed. Thanks.
For my 1996 Grand Cherokee, Thanks to phild328 for this solution, it solved my bogus and annoying "Coolant Sensor bad" message. The solder joints on 4 pins of the my connector were just slightly fractured as in the picture provided by KoreaZJ. I re-flowed solder on all of the pins on that connector... no more bogus alarms.
Yep, I did it to the niner last I had the dash apart, you'll be able to see the bad solder joints.
1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ Platinum Limited 5.9, Backyard parts fodder
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style
Originally Posted by Texas ZJ1
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
I finally made time to remove the VIC. I had a friend reflow the solder connections as I didn't have a soldering iron small enough. (Darn, those pins are SMALL!) No error message since. Thanks to the OP and everyone else for their input.
'96 ZJ, 4.0L, 42RE, NP242, stock D30 and D35-LS w/ 3.73, 4-1/2" lift, 32" BFG ATs, Magnaflow, JKS track bars and disconnects, spare tire carrier, Optima red top, ROLA roof rack, KC SlimLite driving lights, CB and Yaesu ham radios, GPS
Doncha just love it when a 3 year old thread get resurected, and ppl act like it's new info
Some people act like its new info because:
-they just bought a Jeep
-have the same problem
-surfed the web for a solution
-joined this wonderful form
-found a solution
-and like me, it is the first time they visited the form making it “new info” to me
PS you misspelled “resurected” (you forgot an “r”)
Last edited by Tailspin57; 06-30-2014 at 10:29 AM..
Almost like an accidental fart that brightens up your day. Pop, there it is.
This post brightened up my day. I'm vehemently opposed to retaining the VIC, but this thread is a good resource for people that don't feel the same way I do.
__________________ March 2014 GCOTM. 1998 Deep Slate 5.9 On the Jeep:Hot intake, 52mm TB, Summit 8mm wires, catch can, 703s, insulated fuel rails, indexed Champions, Bilstein 4600s, Eibach lowering springs, Moog SS, Ironman mounts, Lotek 2GP, lots of gauges, sparkly paint. In the garage: M1 4bbl In the works: Addco/Hellwig sway bars, nitrous, full polly bushings, full exhaust, data logging, billet UD pulleys
I've had this problem intermittently for several months. I found there were 5 solder posts on the connector that had visible fractures. I also had a surface month resistor that had visible corrosion on the solder. I re-flowed all the connector posts and the resistor and the problem is gone.
A couple years ago I had a problem with the dash lights going out intermittently. This turned out to be a similar solder fracture problem on the headlight/dimmer unit on the left side of the dashboard.