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Old 04-19-2021, 09:27 PM   #1
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How/what to use to read OBD code on Cummins ISL?

Recently, my MIL light came on. (2014 Tiffin Allegro Bus 37AP, Cummins 450 hp ISL)

Foolishly, I assumed the OBD port would be the same as all cars & trucks since the mid-90s. So, I bought an OBD2 reader only to realize you can't fit the proverbial rectangular peg (plug) in a round hole. Bought a conversion cable to connect up, but I'm getting a communication error on the scanner. (Scanner works otherwise. )

So, do I need a specific scanner, different pin mapping between the cables,? Thanks.
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Old 04-19-2021, 09:48 PM   #2
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You might look up insight. You can also find some info about insite on the cummins quickserve.
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Old 04-19-2021, 11:10 PM   #3
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check bluefire-llc. They sell the round device you need. Their device provides the data feed and they provide (free) software that you can create custom displays to output info, not merely diagnostic errors. Careful tho, there are several different devices depending on year of vehicle. There is a lot of info on bluefire on this forum. Use the search tool for bluefire.
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Old 04-20-2021, 06:54 AM   #4
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OTC makes a code reader for the 9 pin port that I think you have. The kit also has the 6 pin adapter. It will also reset most fault codes. Stan
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Old 04-20-2021, 07:20 AM   #5
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Easy peasy since you already have the hardware needed. Use an Android phone and install the free app, Cummins Fault Adviser. It'll read and clear faults plus gives all kinds of info on your engine. Only catch is Cummins stopped publishing the app, now wanting people to pay for the info so it's no longer available on the play store. So do a Google search for Cummins Fault Adviser 1.1.2.5 , download and install the app. It's a Cummins app so works flawlessly.
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Old 04-20-2021, 07:33 AM   #6
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This https://bluefire-llc.com/website/9-p...ndroid-adapter will allow you to use at least their ap and maybe others.

I have OTR https://otrperformance.com/collectio...ostics-cummins and like it because of all the extra info/diagnostics/monitoring it can do with their ap, but the subscription to their ap is $600/year. I’ll probably try something different when the subscription expires.

I ran into the same thing you did with my older OBD2 readers and adapter cables, so I gave up and bought J1939 specific diagnostics.

Does your coach have the ability to read FMI codes on the dash display?
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Old 04-20-2021, 08:06 AM   #7
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Quote:
Originally Posted by davo54 View Post
Easy peasy since you already have the hardware needed. Use an Android phone and install the free app, Cummins Fault Adviser. It'll read and clear faults plus gives all kinds of info on your engine. Only catch is Cummins stopped publishing the app, now wanting people to pay for the info so it's no longer available on the play store. So do a Google search for Cummins Fault Adviser 1.1.2.5 , download and install the app. It's a Cummins app so works flawlessly.
Once you have this ap, how does your device apple/android communicate with the rig? The Op has an OBD2 code reader with a J1939 adapter cable. Nothing to connect to or talk to a “smart device”. Also I searched for that ap but only found suspicious looking third party stuff. Do you have a link to a secure site to download it?
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Old 04-20-2021, 08:29 AM   #8
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Look up ScanGauge D. I've been using one for six years and it will read codes as well as displaying engine functions. Be sure to specify year of your coach as the J1939 connector changed around 2016 models. The one I had on our 2015 RED did not work with our 2017 Phaeton but they replaced the connector and reprogrammed the unit for free. That's great customer service.
https://www.scangauge.com/products/scangauge-d/
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Old 04-20-2021, 08:43 AM   #9
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I believe the OP has a Bluetooth obd2 reader and the j1939 adapter similar to mine in the photo. The Cummins app will connect to the Bluetooth just fine and read all the engine info. Off hand I don't know the best site to download from, use best judgement. I'll try to include a link to my file.
https://drive.google.com/file/d/1YME...w?usp=drivesdkClick image for larger version

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Old 04-20-2021, 12:19 PM   #10
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Why not just use your LBCU to read the code?
I also have a scan gauge as well that allows to me keep an eye on several engine parameters as well as read and clear codes.
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Old 04-21-2021, 06:46 AM   #11
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Thanks for the recommendations. We're in Bandera, TX right now, so not much I can do for a few days until we get back home.

The OBD2 reader is a cabled version from Harbor Freight (Zerich ZR4). Conversion cable was from everyone's favorite online RV store, Amazon. Seller confirmed cable works on Cummins 9 pin port.

I just found a document for testing voltage for each pin. I'll verify the harness is good. There also is a software update for the scanner, but I think that is just for newer cars/ trucks.

It sounds like I should be able to just plug in a standard OBD2 scanner, with the j1939 plug, and read the code so I'm thinking either the wiring or the scanner.
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Old 04-21-2021, 04:31 PM   #12
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I don’t think you’re going to get the Zerich ZR4 to work on a Diesel engine. It’s a base line scanner for cars and small trucks.
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Old 04-21-2021, 04:53 PM   #13
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Thanks. I'll call their tech support tomorrow to see if it should work.
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Old 04-22-2021, 06:42 AM   #14
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Quote:
Originally Posted by garykk View Post
Why not just use your LBCU to read the code?
I also have a scan gauge as well that allows to me keep an eye on several engine parameters as well as read and clear codes.
I use the same setup,
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