midwaytruckrepair Posted June 1, 2022 Share Posted June 1, 2022 i have a 2001 Monaco motorhome Cummins engine dash warning light an i cant communicate with ecm i have checked wire schematic 03 wire at dash plugm16 is the warning light just shows it as engine warning checked powers and grounds at dlc any ideas on diag for no communication Link to comment Share on other sites More sharing options...
Ivan K Posted June 1, 2022 Share Posted June 1, 2022 Have you tried the rear plug too? I also have a diagnostic loop shorting connector over the general brake pedal area but never used it so no idea what it would show. Link to comment Share on other sites More sharing options...
Guest Ray Davis Posted June 1, 2022 Share Posted June 1, 2022 (edited) Is the engine running ok, and just a warning light? Sometimes low coolant can turn the light on. I have had mine come on when coming down a mountain, I guess my RPMs were getting a little to high. My light would stay on until I turned the key off and started again then it always went off. I don't believe it ever threw a code though. Edited June 1, 2022 by Ray Davis Link to comment Share on other sites More sharing options...
klcdenver Posted June 1, 2022 Share Posted June 1, 2022 Get a Scan Gauge D so you can read codes and reset them Link to comment Share on other sites More sharing options...
vito.a Posted June 1, 2022 Share Posted June 1, 2022 What tool are you using to check codes? Link to comment Share on other sites More sharing options...
Hancoman Posted June 1, 2022 Share Posted June 1, 2022 2001 Executive my warning light has been on for 3 years. I have been across country twice without a problem. I will be interested in what you find out. Tom Link to comment Share on other sites More sharing options...
cbr046 Posted June 2, 2022 Share Posted June 2, 2022 There should be an engine diagnostic switch on the dash (at least there is in our 2003 Endeavor / ISC) and a procedure on how to use it in the Cummins manual (maybe Dynasty manual also). Count the flashes. - bob Link to comment Share on other sites More sharing options...
Grampy OG Posted June 3, 2022 Share Posted June 3, 2022 Mine has been on steady for 3 years. The worse part is occasionally it does not come on. Had it into the shop twice for way more money than I should have spent seeing as they never found the problem. I have about given up. If you ever figure it out please advise us. Thanks Ken Link to comment Share on other sites More sharing options...
Randy R Posted June 22, 2022 Share Posted June 22, 2022 We had the low coolant light come on sporadically - a Cummins mechanic fixed the issue by cleaning the electrode that goes into the reservoir. Reached in with a file and cleaned off the electrode from the filler hole. Warning light is gone. Link to comment Share on other sites More sharing options...
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