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Old 01-12-2018, 02:13 PM   #1
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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.

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Michael.
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Old 01-12-2018, 02:34 PM   #2
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That sounds like the OBDII port Michael. Maybe 1" x 3" or so?
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Old 01-12-2018, 03:36 PM   #3
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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.
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Old 01-12-2018, 05:54 PM   #4
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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.
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Old 01-13-2018, 06:35 AM   #5
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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.
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Old 01-13-2018, 06:45 AM   #6
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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.
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