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Old 11-16-2017, 04:58 PM   #1
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Check Eng Light/ECM update

Learned something new today and thought I would share it.

We are on an extended trip with the coach and spending a couple of months in a park in Mesa, AZ. On the way here, we had several instances of the Check Engine Light coming on. The on board diagnosis indicated a code for "Crankcase Breather Pressure Abnormally High". My ScangaugeD would register the same code. Shutting the engine down and restarting would clear the fault. So I had been told by an independent RV engine specialist a couple of years ago that there was an issue with the crankcase breather, but Cummins in Fresno decided that the oil misting symptom was simply due to a bad oil cap seal.

So I set up an appointment with the Cummins shop in East Mesa a few weeks ago. Today was the day for them to look at it and I was dreading what they might find. Well, they hooked up their super duper computer to the ECM using the port back by the engine and found NO codes at all. NOTHING! What they did say though was that our ECM was missing the last 32 software revisions and that three of those revisions had to do with crankcase breather issues. They did a visual inspection of the engine and found no physical evidence of any issues. So that was 2 hours of diagnostics including the software updates and a total of $239.

I won't really know for sure if that will keep the check engine light out until I get up in the mountains and push the engine really hard, but I am optimisitic that the issue is resolved. Questions remain, however.....

1) What happened to the fault codes? They insist that the ECM has a memory and even though the light was reset, their INSITE app would know every detail about each engine parameter and log it.

2) What is the difference in fault codes read by Cummins computer vs the Holiday Rambler/Monaco diagnostic program and my ScangaugeD data taken from the OBD port under the dash?

3) Are the updates just a matter of Cummins "relaxing" some specs and tolerances just to keep the light from coming on?

4) Now that I see the posts about getting your ECM updated every couple of years, I know to include ECM in the search bar next time.

So that's what I did today....hope it might help someone else out there.
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Old 11-16-2017, 05:13 PM   #2
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Thanks for the info Barry!
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Old 11-16-2017, 05:26 PM   #3
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Have you ever seen a computer that didn't require constant updates? Just the way it is.
FYI, the first few years of owning my DSDP I had frequent CEL faults. Same as you, no faults showed up in the ECM (same shop as you were at BTW ).
To make a long story short, I read somewhere that not allowing the WAIT Light to clear on start up will cause the ECM to get disoriented and result in a CEL at some point .
For the past few years I've been cognitive of letting the WAIT Light time out prior to starting and have had maybe two CEL faults in over four years.
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Old 11-16-2017, 07:17 PM   #4
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Quote:
Originally Posted by Barryc737 View Post
Learned something new today and thought I would share it.



We are on an extended trip with the coach and spending a couple of months in a park in Mesa, AZ. On the way here, we had several instances of the Check Engine Light coming on. The on board diagnosis indicated a code for "Crankcase Breather Pressure Abnormally High". My ScangaugeD would register the same code. Shutting the engine down and restarting would clear the fault. So I had been told by an independent RV engine specialist a couple of years ago that there was an issue with the crankcase breather, but Cummins in Fresno decided that the oil misting symptom was simply due to a bad oil cap seal.



So I set up an appointment with the Cummins shop in East Mesa a few weeks ago. Today was the day for them to look at it and I was dreading what they might find. Well, they hooked up their super duper computer to the ECM using the port back by the engine and found NO codes at all. NOTHING! What they did say though was that our ECM was missing the last 32 software revisions and that three of those revisions had to do with crankcase breather issues. They did a visual inspection of the engine and found no physical evidence of any issues. So that was 2 hours of diagnostics including the software updates and a total of $239.



I won't really know for sure if that will keep the check engine light out until I get up in the mountains and push the engine really hard, but I am optimisitic that the issue is resolved. Questions remain, however.....



1) What happened to the fault codes? They insist that the ECM has a memory and even though the light was reset, their INSITE app would know every detail about each engine parameter and log it.



2) What is the difference in fault codes read by Cummins computer vs the Holiday Rambler/Monaco diagnostic program and my ScangaugeD data taken from the OBD port under the dash?



3) Are the updates just a matter of Cummins "relaxing" some specs and tolerances just to keep the light from coming on?



4) Now that I see the posts about getting your ECM updated every couple of years, I know to include ECM in the search bar next time.



So that's what I did today....hope it might help someone else out there.

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Barry thx for the update, wow!
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Old 11-17-2017, 01:28 PM   #5
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I'm sure I'm way behind on updates as well!
Always a little unnerving getting the ECM fiddled with when the engine is running well. Recall reading a thread from a member with a CAT engine, who lost about a mile per gallon after having his ECM updated !
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Old 11-17-2017, 02:06 PM   #6
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I'm sure I'm way behind on updates as well!

Always a little unnerving getting the ECM fiddled with when the engine is running well. Recall reading a thread from a member with a CAT engine, who lost about a mile per gallon after having his ECM updated !


Same here, does that only apply to CAT or Cummins also?
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Old 11-17-2017, 02:17 PM   #7
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You refering to the loss of fuel mileage?

The only one I recall was a Beaver owner with Cat engine.
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Old 11-17-2017, 04:01 PM   #8
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You refering to the loss of fuel mileage?



The only one I recall was a Beaver owner with Cat engine.


Yes, or any other issues with doing ECM updates with our coaches. Thx
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Old 11-17-2017, 05:05 PM   #9
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I think I lost some mileage when my 08 ISL was re-programmed. My DPF filter put me into a stop engine mode and cost $5K . They did several updates and the regenerations have changed in character, sometimes taking an hour.

Recently my transmisson ECM went beserk and threw all kinds of codes and symptoms, including retracting my jacks.
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Old 11-17-2017, 05:38 PM   #10
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Check engine light

Yep had my light come on so I took it to cummins, and they did the software update, and it hasn’t came back on since. Regards
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Old 11-17-2017, 10:58 PM   #11
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They did several updates and the regenerations have changed in character, sometimes taking an hour.
The only time I've had a re-gen take close to that time, It started a re-gen while I was climbing a mountain, didn't finish before I started down the other side. Had to use the exhaust brake for 4 or 5 miles, obviously right off the throttle. Re-gen light went back to flashing during this decent. Finally got back on the throttle and it re-gen'd for probably 20min longer than it normally would.
Thought I had buggered it up, but, what can you do? What goes up, must come down ....... right .
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Old 11-17-2017, 11:20 PM   #12
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Many of the updates we did were to expand the operating parameters, that way less codes were logged. Also many of the codes have to be recognized for a set time before they will be logged into the ECM memory.
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Old 11-18-2017, 06:02 AM   #13
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Had my software updated at the Maintenance seminar in Goshen last May. The Cummins tech claimed that it was missing 15 changes. Well the next day when I started it up it would run for 15-20 seconds and quit and would do that until the temp gauge started to register some heat in the engine. This has continued if the outside temperature is below 50 degrees. Before the update I didn't have this problem. I need to get to a Cummin's shop to check but we live in the sticks and there is no one around here close. Sometimes leaving well enough alone may be the best path!
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