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01-07-2016, 05:54 PM
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#1
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Senior Member
Join Date: Sep 2012
Posts: 284
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No J-1939 data
Our coach has a Cummins ISL400.
Yesterday after driving through a massive rain storm, we pulled into our destination. I shut down the engine and upon restart, the dash display read "no J-1939 data"
The instruments were non-functional and the right turn signal was stuck on without a blink. The "check engine" light was on.
We made it to our campsite and when I shut down the engine again, I got a beeping alarm even with the key off.
I cycled the chassis battery switch and the alarm stopped. Today I started the engine briefly and all seemed normal. No J-1939 message.
Can anyone suggest what my next step should be?
__________________
Jeff, NE7SS, Olympia, WA.
2021 PrimeTime Sanibel 3102
2020 Winnebago View 24D/2014 Newmar Ventana 4037
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01-07-2016, 06:31 PM
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#2
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Senior Member
National RV Owners Club Solo Rvers Club Freightliner Owners Club
Join Date: Mar 2011
Location: FT for 6 years, NW in the summer, S in winter.
Posts: 1,173
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You seem to have an INTERMITTENT problem. Intermittent problems cannot be diagnosed and fixed until they are no longer intermittent. Best approach is to hope, perhaps pray, that it never comes back, and if it does come back, that it will stay until it can be diagnosed and fixed. Any other attempts is just guesswork. Good luck. Rook
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When you get a chance to dance, or sit this one out......I hope you DANCE!
98 National Tradewinds 7370, powered by a 3126B 300HP CAT Turbo, Freightliner XC chassis
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01-08-2016, 08:23 AM
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#3
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Junior Member
Join Date: Aug 2013
Posts: 9
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I would try and find out where the connections are for the J-1939 cable are and check the connections for fit and water getting into them. The Chassis manufacturer and the coach builder should have some cable diagrams or be able to tell you where to start.
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01-08-2016, 08:31 AM
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#4
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Aug 2014
Posts: 1,899
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J1939 is a two wire twisted cable communication bus.
This is how the ECM talks to your gauges and other sensors.
It is a 5v interface. Sounds like moisture got into one of the connectors, several of them are under the chassis.
You could check that each is completely sealed, or hit them one at a time with a spray bottle to see if problem comes back.
The suspect connector is likely near a heat source since it dried out fairly quickly.
Good Luck,
Dan
__________________
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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01-09-2016, 08:23 AM
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#5
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Nov 2010
Location: Texas
Posts: 4,283
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My ISL9 has 2 J1939 ports. 1 inside near steering column, second outside near the radiator. That one's probably wet.
__________________
Full Timers.
2015 Fleetwood Discovery 40E on a Freightliner XCS chassis with a Cummins ISL9 pulling 1 and/or 2 motorcycles, '07 Honda Accord OR a 17' Runabout Boat.
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01-09-2016, 05:17 PM
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#6
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,064
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Jeff....On my 2014 Dutch Star, the main connector is back near the DEF bay on the right side, rear. Mine can only be seen from under the coach. If you crawl under the coach, and look near the back side of the DEF tank, you'll see a box with a bolt going upward through it. This should be your main engine connector. Many have complained that it isn't well protected, especially from water coming off the rear wheels.
While your checking things, here is one more item to double check. In the front run bay, the bay under your driver's window, are several fuse boxes. Their is a black box called Freightliner module on the wall to your right or what would be the wall toward the rear of the coach. Open the box up and you'll find several Bosch relays (small black boxes that are about the size of a 1" cube). Make sure they're all pushed in snugly. These coming loose have been suspected of causing data link issues. I took a piece of foam, cut it to fit the box, placed it inside and closed the lid. The relays can no longer come loose.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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01-10-2016, 12:27 AM
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#7
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Senior Member
Join Date: Sep 2012
Posts: 284
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Thanks everyone for the input and suggestions.
We're in Pismo Beach CA for a while. I'll do some checking when things dry out a bit.
Have to move to a different site Monday. It will be interesting to see if any more fault messages show up.
I'll post what I find.
__________________
Jeff, NE7SS, Olympia, WA.
2021 PrimeTime Sanibel 3102
2020 Winnebago View 24D/2014 Newmar Ventana 4037
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01-12-2016, 06:22 PM
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#8
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Senior Member
Join Date: Mar 2011
Posts: 754
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We had a similar problem with our 2014 Ventana. Acted up one day. Next day all was OK. Took it in to Freightliner. They could see the fault note on the computer, but could not find anything wrong in the cabling. Reoccurred about a year ago while on Freeway in Florida - lost all gauges for a few seconds - check engine light. Pulled into rest area, shut off, and restarted with all OK. Someone here suggested making sure all the relays and fuses were tight in the Electrical bay. I did that last summer - no issues since.
As an aside, we had some problems with the Dash air. Freightliner found a relay that had some corrosion on the prongs in same electrical bay. I guess its possible stuff could have got damp during transport from FCCC to Newmar plant, or while sitting outside.
__________________
2014 Newmar Ventana 4037 / 4018
2015 Jeep Grand Cherokee Ltd.
1940 Chevrolet Pickup
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07-04-2018, 12:21 PM
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#9
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Junior Member
Winnebago Owners Club
Join Date: Jun 2012
Posts: 19
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J1959 Data Error
Thanks for all of the good tips in this thread. Very same issues on a 2014 Itasca Meridian. Got no advice from Freightliner customer support number except take it to a Freightliner shop and spend money and still not get the problem resolved. Have reseated all of the relays and checked both data connection ports. Will have to wait until next road trip to confirm problem solved.
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07-04-2018, 04:44 PM
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#10
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,941
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Quote:
Originally Posted by rvrlyle
Thanks for all of the good tips in this thread. Very same issues on a 2014 Itasca Meridian. Got no advice from Freightliner customer support number except take it to a Freightliner shop and spend money and still not get the problem resolved. Have reseated all of the relays and checked both data connection ports. Will have to wait until next road trip to confirm problem solved.
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rvrlyle,
The way that the J1939 Data Buss was explained was only partial. Yes, it is a data link. In that, it is a THREE WIRE data buss. Two wires carry data back and forth along its route. The third wire is classified as a shield that is there to stop any outside electrical influences from affecting the communications of the yellow and green positive and negative wires.
And all three wires are twisted continuasly, along the entire distance from back of the coach, to the front. Now, speaking of that, yes, there are TWO data ports that can and are used by technicians during SOME diagnostics. The green and yellow wires are looped throughout the system. But, at each end of that loop is a 120 ohm resistor. One usually within the first couple of feet, of the rear data port, visible from the rear of the coach.
The second resistor is quite often placed INSIDE what's called the MMDC or, Multi - Module - Data - Controller. It's the successor to the older, less capable, VDC or, Vehicle - Data - Computer.
The full length of the J1939 is the "Backbone". Where each component ties into it, is called a "Branch" circuit. And those components are:
1. Engine ECM
2. Transmission TCM
3. ABS module
4. Both primary and secondary air systems
But, as stated the J1939 is ONLY a data link, not anything of any analytic value. In other words, it's only responsible for data transfer, not any computer work or function altering. As stated, the J1939 ends up in entering the MMDC which, is normally up front, either in a compartment very close to the front end of the coach or, actually INSIDE the coach, under the dash someplace. It's a black box, about 7" square by about 1"-1 1/4" thick. The primary function of the MMDC is to receive any and all input from all the sources mentioned above and, then interpret them, then send them to the appropriate gauges for your viewing.
The J1939 data link is for the most part, pretty indestructible. With the exception of the data ports on each end, all the junctions where "branch" circuits tie in, bulk head junctions etc. are all triple sealed with multiple outside and inside seals. It's even tough to just unplug any one of those connections. They are made by Deutch and look like this:
https://www.delcity.net/store/Deutsc...CABEgIAIPD_BwE
When a connection is built like this, the statements for them "getting wet" is, well, let's just say that for the most part, they CAN'T get wet. There are multiple connectors of the J1939 running along the entire bottom of thousands and thousands of motorhomes (and trucks, and over the road trucks, busses, and a whole lot more) and if there was a chance for any of those to get wet and cause an issue, we've be seeing way more of these complaints on here and other RV forums.
There's much more to explain concerning the J1939 but, I just wanted to present a bit more on what it is, how it functions, what its importance is and more. Unless a tech at any Freightliner is really, really familiar with the J1939 and, its potential issues, many of them will simply sit there and scratch their heads trying to figure out just where to being analyzing any issue associated with the J1939 system. I know, I went through all of this. I'm the one that had to figure out where and what my issue was.
The techs at a giant Freightliner Repair center in El Paso Texas were totally clueless.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '20 Honda NC750X DCT
2018 Goldwing Tour DCT Airbag
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Heidi character, (mini Schnauzer)!
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04-25-2021, 09:23 AM
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#11
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Junior Member
Join Date: Aug 2016
Posts: 12
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J1938 Fault
Quote:
Originally Posted by Dutch Star Don
Jeff....On my 2014 Dutch Star, the main connector is back near the DEF bay on the right side, rear. Mine can only be seen from under the coach. If you crawl under the coach, and look near the back side of the DEF tank, you'll see a box with a bolt going upward through it. This should be your main engine connector. Many have complained that it isn't well protected, especially from water coming off the rear wheels.
While your checking things, here is one more item to double check. In the front run bay, the bay under your driver's window, are several fuse boxes. Their is a black box called Freightliner module on the wall to your right or what would be the wall toward the rear of the coach. Open the box up and you'll find several Bosch relays (small black boxes that are about the size of a 1" cube). Make sure they're all pushed in snugly. These coming loose have been suspected of causing data link issues. I took a piece of foam, cut it to fit the box, placed it inside and closed the lid. The relays can no longer come loose.
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Just experienced the fault code with fuel gauge not working, continual buzzing from alarm, no engine brake and right turn signal locked on solid. Since you wrote this do you have any other suggestions. I have a 2014 Mountain Air so we should be built the same. New to using this format so forgive me if this is the wrong way to go about diagnosing the issue.
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05-27-2021, 01:32 PM
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#12
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Junior Member
Fleetwood Owners Club
Join Date: Dec 2020
Posts: 17
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Hey Scott, Brian here with a 2015 Fleetwood Discovery Freightliner Xc chassis. Just had the J1939 no data issue but with mine the coach will not start as well. No attempt to crank, the Transmission display does not light all I get is the freightliner display lighting up,, the annoying howl amber check engine light and nothing else. any thoughts?
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05-28-2021, 06:35 AM
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#13
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Junior Member
Join Date: Aug 2016
Posts: 12
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J1938 Fault
No sure I am doing this correctly but my J1938 fault code was resolved by taking it to Transwest RV in Frederick, CO. They found that it was a loose wire under the dash. While there they also found a nox sensor engine code and had to replace the sensor. No issues sense then. Hope this might help someone in the future.
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