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Message: <blockquote data-quote="thetool" data-source="post: 17917" data-attributes="member: 1534">The hour glass symbol lights up next to the numbers and displays hours during normal operation.I was looking at my books-did you get or do you have code EC-3?  If you replace the sensor, and the wires from the controller to the sender are good, the only things left are the controller, the wires to the display and the display itself.  Or sometimes the plug pins and sockets are damaged so you unplug form the controller, stick a probe in the socket on the plug, and you get good continuity, but when you reconnect to the controller, the contact is not there.I'm assuming you have schematics-trace out and check continuity from the controller to the display and really eyeball all those pins and pin sockets on the controller, harness and dislplay.If all still good, my guess is a bad controller, since your display is lighting up and you are getting a bar.2 things-This is all assuming the system is lying-which I guess you already know since you mentioned an IR thermometer.And, embarrassed to ask, but sometimes folks confuse an EC and ECL code, or maybe your display is not lighting that center position and you have an ECL3?  Which would be the sensor on your radiator monitoring coolant level.The BOSS system can be such a pain in the scrote.Good Luck.</blockquote>