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Old 07-26-2018, 06:33 PM   #1
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Engine Light Issue 400 ISL Cummins

Hi all; I have an unusual issue with my 2005 Newmar Mountain Aire; I am getting a check engine light which will change when I change the setting on the Dash Air control, You can't make this up, If I turn the airflow indicator to the off position all works just fine but if I turn it on with the engine running, the effect varies; i.e, i get multiple check engine lights up to and including the stop Engine Light at which time the engine will shut down.
Has anyone ever even heard of this before, if so i would be delighted to hear what the fix was

happy RVing everyone

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Old 07-26-2018, 09:31 PM   #2
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Engine light issue 400 isl cummins

Wowsers! Air flow indicator? Compressor maybe? Is this happening every time you turn on the dash air or after running for a while. Iíll go out on a limb here and I know theyíre two different animals, mine is a different make and an ISM, but I found that after running the dash air in real hot conditions I would lose voltage down to below 12volts after a few hrs. Found that the factory had put the alternator excite wire and the air conditioner compressor on the same re-settable circuit breaker. When the compressor kicked the breaker it would kill the excite wire which tells the alternator to charge. Not saying this is your case but it leads me to believe something is sharing with the air system and they donít get along right now. The best thing to do is find out what the fault codes are. For what a Cummins dealer charges for one hour you can buy an instrument to read the fault codes. This would be my starting point. You can guess it to death but not knowing whatís making your check engine light come on youíre in the dark.
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Old 07-26-2018, 09:39 PM   #3
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How is your coolant level?
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Old 07-29-2018, 01:12 AM   #4
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You should post this question on the Newmar Owners Forum here in IRV2. You will probably get more informed answers from other Newmar owners.
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