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Old 10-02-2011, 02:25 PM   #1
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"warning" light not the check engine

I have a 2001 Monaco Diplomat that the "warning" light comes on every once and a while. this is NOT the check enging light and it sets no codes. I thought it was a temp warning light at first because it seems like it would come on when i was pulling hills and the engin temp would get up to about 200 but that does not seem that hot to me. it does go out if I back off the throtle for a while but it still does not seem right. the book says that a fluid level is out of spec but I have checked them all and dont see a problem. the oil may be a little over full but after 6400 miles it should have blow off any extra. any ideas would help thanks
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Old 10-02-2011, 02:46 PM   #2
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It could be that your antifreeze is old, and yes that can cause the warning light. Take the probe out of your coolant tank and clean it with a scotch brite. That may be the problem.

I also had the light and finally mine stayed on. I changed all the fluids and still had the light. There was a code set that indicated a problem with the engine speed sensor. There are two of them on my ISC, one is a back up for the other. Cummins changed both as that was less expensive than the labor cost of a lengthy test process to determine which was bad. It fixed the problem - no more warning light. Nothing in the Cummins manual says anything about the warning light being associated with the engine speed sensor.
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Old 10-02-2011, 04:19 PM   #3
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I had the warning light flash on briefly on several occasions during a trip. It eventually turned out to be a fuel filter. Possible low fuel pressure?
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Old 10-02-2011, 06:43 PM   #4
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I just had the entire fuel system replaced in august due to a main electrical harness problem. It took out the injection pump. I had them replace the lift pump at the same time. I will check the antifreeze probe this week. Thanks keep em coming
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Old 10-03-2011, 08:21 AM   #5
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According to the manual......Warning Light - Out-of-range condition exists within the engine protection circuits. Stop the motorhome , check all fluid levels.

The fact that it is flashing indicates that it is probably fluid sloshing around at a low level.
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Old 10-03-2011, 12:14 PM   #6
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Yes mike that is what I have found in the book. I need to clarify that the warning light does stay on for a minute or so it does not flash. I guess my big concern is is the light or engine protection circuit connected to the fuel pressure in any way. I can not confirm that with cummins it seems like this light is just related to fluid level in the engine. Oil or coolant. Seeing as how it seems to happen when the temp goes up I am leaning towards the coolant system. I really appreciate all the discussion it helps me to work the problem out logically. The fuel filters that were mentioned still bother me.
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Old 10-03-2011, 12:17 PM   #7
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Quote:
Originally Posted by tomgagne
I had the warning light flash on briefly on several occasions during a trip. It eventually turned out to be a fuel filter. Possible low fuel pressure?
This could be my issue as well filters are both new but the primary one was leaking after it was replaced at one point. It does not leak now but I think I will replace it to be sure
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Old 10-03-2011, 12:24 PM   #8
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Not sure if this counts... I'm in a 2003 Holiday Rambler "Imperial" on a Monaco Road Master frame. The WARNING light will give me a mini flash at times then go away. It will sometimes come on and the engine will shut down when I'm gliding along at about 60/70 mph. I let off the pedal and the engine will resume. When I pull over, I then will shut it off & re start .....the light will reset and not be seen from for another 1000 miles or so..... then the same thing over again. The origional owner tells me he had the same thing going on. He had it looked at & they could find nothing out of the norm. He just lived with it. Anyone have a thought on this?

Thanks,

mike
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Old 10-03-2011, 01:26 PM   #9
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Quote:
Originally Posted by Rex
It could be that your antifreeze is old, and yes that can cause the warning light. Take the probe out of your coolant tank and clean it with a scotch brite. That may be the problem.

I also had the light and finally mine stayed on. I changed all the fluids and still had the light. There was a code set that indicated a problem with the engine speed sensor. There are two of them on my ISC, one is a back up for the other. Cummins changed both as that was less expensive than the labor cost of a lengthy test process to determine which was bad. It fixed the problem - no more warning light. Nothing in the Cummins manual says anything about the warning light being associated with the engine speed sensor.
I looked at the coolant probe and it looks like I need to clean it if u can figure out how to get it out. The thing is, on the dash it has a low coolant light that never comes on. Do ya think Monaco put two warning lights on the coach or do ya think I am still looking at something else.
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Old 10-03-2011, 08:18 PM   #10
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Yes there are two lights, one is Low Coolant and the other is Warning.

The probe, if yours is like mine, is long. It goes into a rubber grommet that is fitted into the top of the tank and there is one wire connected to the probe. Disconnect the wore and pull the probe upward. It doesn't come up or out easily. The rubber will also come out but only after the probe is removed.

The return path for the probe is through the antifreeze fluid and if scale builds up on the probe it does not work well.

If you have never seen the Low Coolant light, you may want to check and see if you have a bulb in that position. Your manual should show where it is located on you panel.
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Old 10-04-2011, 06:18 AM   #11
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Good info there. I am going to play with it the next chance I get. I can see the scale on the probe and the light does come on on the dash when you first turn the key so I know the bulb is working correctly. I will clean the probe and test the antifreeze itself and report back. Thanks for the advise
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Old 10-04-2011, 08:35 AM   #12
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Even if the antifreeze test OK for the DCA, it can still be the problem if it is old. Check to make sure it still meets the time requirement for the type you are using.

Even when I changed mine, it did not solve the problem. Mine turned out to be an engine speed sensor that has nothing to do with fluid levels, but my light finally came on steady before a code got set to find the problem. It would come on and go off for months, then went steady.
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Old 11-02-2011, 06:06 PM   #13
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Nivek did cleaning th probe fix your problem?
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Old 11-04-2011, 05:04 AM   #14
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It had a good amount of white crusty stuff on it that I scraped off with a plastic scraper. I have not had a chance to realt push it yet. I am going on a little trip this weekend so I hope to have an answer soon. One question I have is how does this probe work? I see the wire attached to the probe but there is no electrical return through the fluid. It it just an on off thing or what. I am still wondering if this is the problem because the low coolant never has come on. I did check the bulb it works on initial start up.
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