RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Monaco Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 01-12-2018, 02:13 PM   #1
Junior Member
Join Date: Jan 2016
Posts: 24
What is the diagnostic connector for on a 97 HR Navigator

I found a small rectangular box "Diagnostic Connector" at the driver footwell. What is it for? My engine is all mechanical Cummins 6CTA 8.3. I would think that the Diagnostic port is for newer electronic control engine.


MichaelU295 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-12-2018, 02:34 PM   #2
Senior Member/RVM #90
MSHappyCampers's Avatar

Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 32,849
That sounds like the OBDII port Michael. Maybe 1" x 3" or so?

Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
MSHappyCampers is offline   Reply With Quote
Old 01-12-2018, 03:36 PM   #3
Senior Member
clyon51's Avatar
Monaco Owners Club
Join Date: Mar 2012
Location: Arizona West RV Park, Yuma, Az
Posts: 4,193
Itís a diagnostic port. Most heavy diesel trucks in North America use two basic protocols for diagnostics, J1708 and J1939.

J1708 is an updated version of J1587, it is used on older vehicles and usually is used on a 6 PIN round diagnostic port under the dash on the drivers side.
So take a close look, Iím sure itís a J1708 Connector.

There are plenty of electronics on Ď97s.
John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
clyon51 is offline   Reply With Quote
Old 01-12-2018, 05:54 PM   #4
Senior Member
Monaco Owners Club
Join Date: Sep 2014
Location: UK
Posts: 447
Itís possible itís for the ABS, I too have the 6C8.3, my RV is a bit weird I think it must have been just about the last one out of the factory before they moved to the ISC as a lot of the documentation (and the diagrams of fuses, etc. refers to ISC) when I first got it I had a look under the dash, saw a diagnostic connector and thought ďgreatĒ so went out and bought s silverleaf, plugged it in and of course got virtually nothing, it was only when I got lower down did I notice that it was labelled as ABS and the space marked ďengine diagnostic was just an empty hole.
ElvistheKing is offline   Reply With Quote
Old 01-13-2018, 06:35 AM   #5
Senior Member
veraken's Avatar

Monaco Owners Club
Vintage RV Owners Club
Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 1,077
I have the same engine. When I contacted Cummins and asked about the OBDII port, I was told there is none listed for our engine. If you haven't already done so, go to https://quickserve.cummins.com/info/index.html and register you engine (you will need to know your engine serial number). It's a great source of info.
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
veraken is offline   Reply With Quote
Old 01-13-2018, 06:45 AM   #6
Senior Member
NHRA225's Avatar

American Coach Owners Club
Join Date: Jan 2011
Posts: 2,057
Surprise !
If your Coach is all Mechanical there is no OBD Port.
The Plug your looking at is Most Likely the Diagnostic port for Your Allison Transmission.

Brownsburg Indiana
1992 American Eagle-8.3C-450hp
NHRA225 is online now   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Where is the diagnostic connector on an '88 Southwind atikovi Vintage RV's 11 07-26-2011 08:55 PM
Just bought VMSpc, Can't find Diagnostic Connector! HELP!!!! dapperphil Monaco Owner's Forum 6 06-30-2010 07:30 PM
Location the diagnostic link connector(OBD2) Marty M Ford Motorhome Chassis Forum 8 07-30-2008 10:44 AM
Cant find computer diagnostic connector. Steve Day 51 MH-General Discussions & Problems 5 01-16-2007 06:27 AM
ScanGauge & diagnostic Connector ohiorvers Winnebago Industries Owner's Forum 2 10-01-2005 04:48 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:22 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.