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Old 07-03-2018, 05:48 PM   #1
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Post Diagnostic port type and location

Hello,

As the title indicates, I am trying to figure out the diagnostic port type and location for a few school bus varieties. Do school buses typically use the standard 9 pin j1939/j1708 connector? Are there any resources for finding out for individual vehicle types? I will need to find the port type and location for several bus types. The first 2 are

Blue Bird
Model: D3FE4
Year: 2013
VIN: 1BABNCPA3DF292329
Body: F430976
Engine: Cummings ISB-10

The second is

Thomas
Model: Saf-t-Liner HDX
Year: 2007
VIN: 1T7YT4A2571278255
Body:538072
Engine:MBE-906

Any help would be greatly appreciated! Thank you
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Old 07-04-2018, 01:09 PM   #2
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Join Date: Feb 2018
Location: Tahoe
Posts: 506
Year: 1997
Coachwork: International
Chassis: 3000RE
Engine: T444E w/ MT643
Rated Cap: 84 pass, 40'
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Originally Posted by Orion View Post
Hello,

As the title indicates, I am trying to figure out the diagnostic port type and location for a few school bus varieties. Do school buses typically use the standard 9 pin j1939/j1708 connector? Are there any resources for finding out for individual vehicle types? I will need to find the port type and location for several bus types. The first 2 are

Blue Bird
Model: D3FE4
Year: 2013
VIN: 1BABNCPA3DF292329
Body: F430976
Engine: Cummings ISB-10

The second is

Thomas
Model: Saf-t-Liner HDX
Year:2007
VIN: 1T7YT4A2571278255
Body:538072
Engine:MBE-906

Any help would be greatly appreciated! Thank you
Can't speak to other types but my 1997 International has an older 6 pin port in the rear engine compartment AND under the steering wheel. I couldn't *find* the one under the steering wheel until we removed the driver seat and unhooked the zonar that was plugged into it. I saw that it looked like one, but I just didn't understand what I was looking at until it was taken apart. My understanding is that you need a Scangauge D to read the info off ALL diesel engines, not just older ones. Qith an international if you have the VIN you can call the dealer and get info on the original build (ask for the line set ticket) including the port. I would think you could with other types as well but I can't confirm that.
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Old 07-09-2018, 01:34 PM   #3
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Location: West Ohio
Posts: 787
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Both of those busses will use the deutsche 9 pin connector, and it should be located below the dashboard, near the driver's knee area.
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Old 07-11-2018, 05:11 PM   #4
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Thanks for the help.

Any idea on a 2005 Thomas with a Caterpillar C7 Diesel?

Thomas G-280FE 2005 1T7YT4C2451158408
Thomas G-278FE 2005 1T7YT4C2251158410

Thanks so much for the help!
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Old 07-11-2018, 06:33 PM   #5
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Location: Ashtabula, Ohio
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Year: 1996
Coachwork: Thomas
Chassis: International
Engine: T444E 7.3L
2007 and older wil have the older 6 pin connector under the dash with j1939. Some diag connectors may be located under the hood on driver's side.
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Old 07-12-2018, 08:51 AM   #6
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Join Date: May 2014
Location: West Ohio
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Year: 1984
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Chassis: International 1753
Engine: 6.9 International
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I'm thinking both of those cats will be on 1939. The only time I've seen 1708 used after the early 2000's is with the internationals. I could be mistaken though.
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Old 07-12-2018, 09:29 AM   #7
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Originally Posted by Booyah45828 View Post
I'm thinking both of those cats will be on 1939. The only time I've seen 1708 used after the early 2000's is with the internationals. I could be mistaken though.
And you think they will be 9 pin or some proprietary connector? Thanks!
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Old 07-12-2018, 10:28 AM   #8
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And you think they will be 9 pin or some proprietary connector? Thanks!
9 pin. i need more words.
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Old 07-12-2018, 10:47 AM   #9
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Join Date: Feb 2018
Location: Tahoe
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Engine: T444E w/ MT643
Rated Cap: 84 pass, 40'
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9 pin. i need more words.
It's probably a J1939/J1708 and a Scangauge D will read it. These codes refer to the 6 and 9 pin connectors I believe. I found mine in the engine compartment easily (it's in that box where you can start the engine in the back) but the one under the dash had something plugged into it which confused me. The zonar system was plugged into it.
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Old 07-12-2018, 11:03 AM   #10
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Engine: 6.9 International
Rated Cap: 65
1939 and 1708 refer to the communication protocol that is used. Those codes will be used as a reference to the connector but it's not the technical name of the connector and I dont think the protocol mandates the use of the 9 or 6 pin connector.

Most busses that have the 9 pin connector will use the 1939 line and will also have a 1708 line. I think the 1708 comm line is used primarily for dtc purposes between modules in case the 1939 line fails, the majority of data will be on the 1939 line.

If it has a 6 pin, then you're likely using 1708 and the data will be on that.

With that said, most busses in the last 15 years will have 1939. All busses after 2007 will use 1939.
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