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Old 04-02-2011, 03:46 PM   #1
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Question On Board Diagnostic system connection adapter to ODBII

I have a 2002 Alpine 38ft and am looking for an adapter from the installed OBD system with a doetsch connector to a OBDII computer diagnostic system. Is there such a thing?

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Old 04-02-2011, 04:11 PM   #2
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Hi dtimme,
I have also looked for a conversion from the chassis/engine diagnostic plug to an OBD II connector. I do not think they exist.

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Old 04-02-2011, 07:01 PM   #3
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Not 100% sure, but according to information that I have found on the Internet... if the chassis is over 14,000 GVW I doubt it has OBD II Compliant signals as those vehicles over 14,000 GVW are not required to be OBD II Compliant.

Quote from http://pureenergysystems.com/store/ScanGauge/FAQ.htm:

"QUESTION: What about an RV?
ANSWER: The ScanGaugeII requires the vehicle to be OBDII compatible. Vehicles over 14000 pounds GVW in the US and Canada are exempt from the OBDII requirements. Most RVs are over 14000 GVW. The reason the ScanGaugeII works in most of them is that even though they are over 14000 GVW, they use engines that are from vehicles that are under 14000 GVW. The Ford V8,V10, Powerstroke; the GM V8, workhorse and Duramax; the Dodge V8 and Cummins engines that are found in their pickup trucks are OBDII compatible. Freightliner, MAC, Detroit diesel and the other "big rig" engines are never found in under 14000 GVW vehicles so they were never made OBDII compatible."
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Old 04-02-2011, 07:50 PM   #4
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Thank you for replying. I found that 18 wheelers and military vehicles have OBD systems and they use the Doetsch connector to the computer. But, most mechanic shops have the OBDII capability. Still looking for an answer.
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Old 04-03-2011, 01:22 AM   #5
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Is your RV a DP? If so you probably have a J1939/J1587 type data system. I use the VMSpc system to read diagnostics. It connects to a 6 pin or 9 pin round connector.
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Old 04-03-2011, 08:07 AM   #6
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Greystoke is correct. Heavy duty diesels do not use OBDII. They do have On Board Diagnostics (OBD) but it is the J1939 protocol, which means any OBDII diagnostic system cannot read that data protocol. You'll need a different system, such as the Silverleaf, to read that data stream.

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