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Coolant warning Cluster problem?

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Old 10-03-22, 11:21 PM
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Coolant warning Cluster problem?

Been reading all night about the continuous coolant level warning beep.

Mine started going off randomly yesterday but the coolant light never came on. Obviously I checked and topped off coolant. I tried to ground the sensor at both the sensor and at the CPU 2 with no luck. I even disconnected the CPU 2 and the alarm still kept going off, which surprised me because I thought the beeper was in the CPU. I was able to disconnect the coolant sensor and the light did come on so it doesn't seem to be a sensor issue. Looking through the wiring diagram could this be a cluster problem since that is first in line with the alarm system? Any help before I start throwing money at the problem.
Old 10-04-22, 09:12 AM
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When you say you ground it at the sensor, where exactly and how did you do it
Old 10-04-22, 09:21 AM
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Disconnect sensor at the single spade, connect an extension wire to existing ground. Touch the two together.
Old 10-04-22, 09:50 AM
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Sensor to ground or the wire that attached to the sensor to ground?
Old 10-04-22, 10:10 AM
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Not to be a jerk, but hooking up a disconnected sensor to a ground wouldn't do much of anything. Can we assume I know how to ground out a wire and move forward?

What I don't know is if a bad instrument cluster can cause the continuous beep, and where the beep is even coming from if I disconnected CPU 2. Seems like most people who had this issue had a CPU 2 with bad circuit board.
Old 10-04-22, 11:49 AM
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Having been in quite a few troubleshoot threads I can say that assuming anyone knows how to do anything simple or complex doesn't work. Seeing you've been on the forum a while but not active you may not understand why a foundation of competence has to be established first.

for example....... I will ASSUME you tried grounding the low level wire at the charge harness after trying at the water neck didn't work. I will also assume you know that the wire that plugs into the sensor is nothing more than a bridge. Its just an extension cord to jump the sensor to the charge harness. I will assume you know that if there is an issue with this wire that the test you did will yield the result you got.

I'm right in my assumption or can we go through the steps of this FREE tech help section?
Old 10-04-22, 02:20 PM
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Yes I am aware that the wire connects to the engine/front harness connector. It was discussed in no less than 3 other "continuous beep" threads. I tired grounding the wire at all those locations in accordance with prior posts on this topic.

Now do you see how easy that was to ask if I checked at the X-12 connection as an adult, instead of post by post asking exactly what I did step by step? I can also read a wiring diagram. Yes I have been here over 10 years. Yes I have worked on all of my rotaries. Yes this is my first 3rd gen, and yes this is the first time I have had to troubleshoot it. Which is why I am specifically asking about a strange occurrence with a coolant beep, but no coolant light which doesn't seem to be connected with a fault in the CPU2. I know enough to know that 3rd gens and soldier/chip/interments are issues, and I also know enough to know that my experience with 2nd and 1st gens doesn't cover that topic. Which is why I am here.

There is nothing wrong with asking the "did you see if you have gas in the car" questions, I have also dealt with giving out advice to people who have missed steps 1-5 and jumped to 26. All of us with experience still make simple mistakes. But just ask it.

Sure this advice is free. But that doesn't mean I have to silently put up with the way in which you decide to provide your brand of it. I was just politely trying to save you the trouble of asking me about every step of the path that brought me here, at no time did I attack you or question how smart you were. If my "not trying to be a jerk" comment was too much of a personal attack on your ego then feel free to stop providing advice. I need your (or any other 3rd gen electrical guru) help and knowledge right now to help me fix this before I buy a new CPU, cluster, and sensor out of desperation of trying to fix this before my trip this weekend. If that is too much to ask without the condescension then I will wait for the next guy or get a rental car.
Old 10-05-22, 05:53 PM
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Originally Posted by WingleBeast
What I don't know is if a bad instrument cluster can cause the continuous beep...
I solved my coolant level warning issue by fixing the speedo and tach in the gauge cluster. Grounding the wire will not quell the noise in this situation.
Old 10-06-22, 04:48 PM
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Thanks level, I'm going to take a look this weekend. Hopefully the board isn't damaged beyond my limited ability to solder.
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