93 grand cherokee 5.2 V8, red square flashing on VIC display

Wrong. The red square was unique to 1993 and early 1994 ZJs with the VIC. Chrysler offered an oil level sensor on both engines and due to a high failure rate, they discontinued it. The accompanying message should read "Check Oil Level". I had this problem when I replaced my VIC in my late 1994 model with a 1993 model VIC and it showed this message all the time. Check your engine oil level and if it is fine, there is a wire you can short to ground behind the VIC unit to shut it up. That's what I had to do.

Sorry I cannot help you with the wire pinout, you'll have to figure that out on your own. Good luck with your problem and anymore questions, feel free to e-mail me at [email protected]

-Rob

Your VIC doesn't provide you with codes per se, it supplies other information and what you describe here is what should be written on your VIC, "Coolant Sensor Bad." The actual Coolant Sensor runs to your PCM or computer and your check engine light will come on if it runs at or above 5 volts or below 0.1 volts. If the red square on the vehicle layout is illuminated under the hood area, it means that your Coolant Recovery jug is either low on anti-freeze or the sensor next to the yellow filler cap is faulty...meaning you're low on Coolant and the VIC says that the "Coolant Sensors Bad" yet it's the amount of fluid in the plastic bottle next to the passenger side firewall, right in front of your PCM or computer. If you're low on anti-freeze, keep an eye on it, or have the coolant system pressure tested...including the 18 pound cap on the radiator itself. Also check the two wires hooked to the Coolant LEVEL Sensor in the jug with an Ohmmeter and it should be an open circuit if the level is fine, or hardly any Resistance if the level is low, causing that circuit to complete it's ground circuit and thus signaling the VIC through your BCM to turn on. (Body Control Module). The Haynes Manual you will need is # 50025 which encompasses all Jeep Grand Cherokee's from 1993 thru 2004.

~Stillin~

I just recently came across the same problem 93 jeep Zj square light in Vic panel, in my situation I am really low on tranny fluid cuz of a slight leak I have, fluid not showing on stick I'm thinking that's the problem super low tranny fluid check it!! Hope this helps