B3350 Diagnostic Port Location?

Rob.Cox.Kubota

New member

Equipment
B3350
Apr 26, 2025
3
0
1
Cornwall
I have a 2018 B3350 and I cannot find the Diagnostic Port location.
I have looked everywhere and followed the wiring harness several times.

Can someone please help!!
 

Rob.Cox.Kubota

New member

Equipment
B3350
Apr 26, 2025
3
0
1
Cornwall
Thank you for the reply.

I would like to purchase Diagmaster to troubleshoot error codes. From what I can find, Kubota uses a 4-pin diagnostic connector (lots of companies sell a Diagmaster equivalent).
I can neither locate a 4-pin diagnostic connector on my tractor, or any diagnostic equipment that connects directly to the ECU.

The aforementioned thread states, " Any download to update it is done through the diagnostic port by the dealer. The port is located under the seat on Cabin models and on the LH side of the engine, right above the ID tag on the ROPS models. " I have the ROPS model and ID tag on the tractor frame is on the left-hand side beside the battery (no 4 pin connector).

Do you happen to know exactly where the 4 Pin diagnostic connector is located (if it exists) or how the dealer would connect to the ECU.
 

RCW

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BX2360, FEL, MMM, BX2750D snowblower. 1953 Minneapolis Moline ZAU
Apr 28, 2013
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Chenango County, NY
Shucks - - thought I found something helpful, but it's L series and photo is a "Generic" picture.

Does 2015 Kubota l series have diagnostic port? | OrangeTractorTalks - Everything Kubota

Found ECU reference in Kubota Tractor Corporation - Illustrated Parts List

Hard to get a reference as to its location. That's for a ROPS tractor.

Screenshot 2025-04-26 145923.png


Is this a cab or ROPS model?

I've gotten so I'm squeamish dealing with electrical/control systems. Too many possibilities of things going awry. Don't even like to change batteries on ECU/ECM equipment anymore. Heard too many horror stories.
 
Last edited:

Rob.Cox.Kubota

New member

Equipment
B3350
Apr 26, 2025
3
0
1
Cornwall
Shucks - - thought I found something helpful, but it's L series and photo is a "Generic" picture.

Does 2015 Kubota l series have diagnostic port? | OrangeTractorTalks - Everything Kubota

Found ECU reference in Kubota Tractor Corporation - Illustrated Parts List

Hard to get a reference as to its location. That's for a ROPS tractor.

View attachment 153286

Is this a cab or ROPS model?

I've gotten so I'm squeamish dealing with electrical/control systems. Too many possibilities of things going awry. Don't even like to change batteries on ECU/ECM equipment anymore. Heard too many horror stories.
****Thank you for the reply****
I have the ROPS model. The ECU (pictured in the supplied illustrated parts list) Is located under the dashboard. However, but i cannot locate a 4-pin diagnostic connector anywhere near it.