RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Workhorse and Chevrolet Chassis Motorhome Forum
Click Here to Login

Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  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 09-05-2018, 09:48 PM   #1
Member
 
NormD's Avatar
 
Winnebago Owners Club
Join Date: Jul 2011
Location: Beaverton, Oregon
Posts: 48
How to read "OBD 1-1/2"?

I am sure many of you are aware that Workhorse used a hybrid OBD2 readout on their chassis around year 2000. It is sometimes referred to as OBD 1-1/2. Has anyone found a way to get information out of this OBD2 socket? So far, the only advice I've heard is to "take it to a dealer."
__________________

__________________
2001 Winnebago Brave SE 26P
Workhorse, P32, 7.4L
2000 chassis, SuperSteer springs
NormD 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 09-06-2018, 12:31 AM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 17,200
Not sure what you coach's, Data Link Connector , is shaped like ; but if you Google , DLC to OBDII adaptors ; maybe you can find what you need.
__________________

__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-06-2018, 07:14 AM   #3
Senior Member
 
Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
Posts: 1,331
Never heard of it. If it has an OBD2 connector it is OBD2. If you can't get any info there could be something wrong with the connector or the ECM.
speed racer is online now   Reply With Quote
Old 09-06-2018, 08:19 AM   #4
Member
 
NormD's Avatar
 
Winnebago Owners Club
Join Date: Jul 2011
Location: Beaverton, Oregon
Posts: 48
Sorry, speed racer, but they are the standard OBD2 connectors used on all new vehicles since 1996, except Workhorse, apparently. The Oregon Department of Transportation is well aware of the problem and automatically uses the exhaust gas tube at 2000 RPM to check for emission problems. Mechanics tell me that it is a midway software interface after OBD1 and before OBD2, which apparently contains all or most of the OBD2 data, but needs different equipment to read the output from the connector.
__________________
2001 Winnebago Brave SE 26P
Workhorse, P32, 7.4L
2000 chassis, SuperSteer springs
NormD is offline   Reply With Quote
Old 09-06-2018, 09:58 AM   #5
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 17,200
Norm , judging by the number of adapters available ; using the Google search ; Workhorse wasn't the only manufacturer , not using the SAE standard connector .
There are even OBDII connectors with pig tail wires attached available , if it's possible to re-wire the DLC you have to the SAE standard.

Could you post a photo of your DLC.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-06-2018, 02:07 PM   #6
Member
 
NormD's Avatar
 
Winnebago Owners Club
Join Date: Jul 2011
Location: Beaverton, Oregon
Posts: 48
Sorry Skip426, but it IS the standard SAE connector in all mechanical respects, but the output cannot be read with a standard OBD2 reader. I have no way of telling how much OBD2 data is available to this connector. Are you aware of any adapter that will convert the output of my OBD2 SAE connector to the same standard OBD2 SAE connector, with the data output on the correct pins?
__________________
2001 Winnebago Brave SE 26P
Workhorse, P32, 7.4L
2000 chassis, SuperSteer springs
NormD is offline   Reply With Quote
Old 09-06-2018, 09:19 PM   #7
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 17,200
Quote:
Originally Posted by NormD View Post
Sorry Skip426, but it IS the standard SAE connector in all mechanical respects, but the output cannot be read with a standard OBD2 reader. I have no way of telling how much OBD2 data is available to this connector. Are you aware of any adapter that will convert the output of my OBD2 SAE connector to the same standard OBD2 SAE connector, with the data output on the correct pins?
When I was looking at adapters , I saw a pin out of two similar connectors , I'll see if I can find it again.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-06-2018, 10:09 PM   #8
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 17,200
Ok , so far I found this photo, and a bunch of OBD II readers that say they support ALL OBD II protocols, I would assume that means if the reader plugs in you should get a read out. .
Has your connector been tested for power and ground ?
Attached Thumbnails
Click image for larger version

Name:	OBD II connector pinout.jpg
Views:	98
Size:	95.1 KB
ID:	217980  
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-06-2018, 10:34 PM   #9
Member
 
NormD's Avatar
 
Winnebago Owners Club
Join Date: Jul 2011
Location: Beaverton, Oregon
Posts: 48
I am learning more about OBD than I ever wanted to. Wikipedia refers to OBD1.5 as a General Motors interface. It states that a special scan tool is required.

The following photos are of the 2000 Workhorse OBD1.5 and a 2006 Dodge Grand Caravan OBD2.

IMG_1620.jpg
IMG_1623.jpg
Comparing the SAE J1962 connectors, my 2006 Dodge Grand Caravan uses pin 7 (ISO "K" line), pin 9 (Mfg. option), and pin 15 (ISO "L" line). Workhorse does not. Both provide serial data on pin 2. Apparently, the K line carries the data used by most readout tools, while the L line may or may not be used. I haven't learned yet what data is available on pin 2, but I suspect it is a very limited subset of K line data. I am afraid I am out of luck, trying to find a simple readout of Workhorse engine data.
Attached Thumbnails
Click image for larger version

Name:	IMG_1620.jpg
Views:	52
Size:	242.1 KB
ID:	217981   Click image for larger version

Name:	IMG_1623.jpg
Views:	50
Size:	237.2 KB
ID:	217982  

__________________
2001 Winnebago Brave SE 26P
Workhorse, P32, 7.4L
2000 chassis, SuperSteer springs
NormD is offline   Reply With Quote
Old 09-06-2018, 11:25 PM   #10
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 17,200
A GM chat room has posts about this scan tool being the one to use.

Actron OBD I & OBD II code reader for use with OBD 1.5

Actron CP9690 Trilingual Code scanner.

I can't access US pricing for it $ 270 CD .
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-08-2018, 09:54 AM   #11
Senior Member
 
Daveinet's Avatar
 
Join Date: Dec 2013
Location: Chicago Area
Posts: 643
Quote:
Originally Posted by speed racer View Post
Never heard of it. If it has an OBD2 connector it is OBD2. If you can't get any info there could be something wrong with the connector or the ECM.
The transition from OBDI to OBDII took some time at GM. GM began using the OBDII connector in 1993, but did not start using the OBDII standard until 1996, and then not across the board. I know this, as I am very familiar with programing a 1995 747 GM ECM. This used an OBDII connector, but still was OBDI standard.



SO, for the OP. The best thing you can do is see if you can pull the part number off the ECM. This will let us know what protocal is being used. IF I had to take a wild guess, I would bet the part number ends in 747, the same ECM that was introduced in 1993. If so, there is a ton of information about that ECM, including very detailed programing support - most of which is free, or with voluntary donation encouraged.



I stated OBDI "standard", which is really a misnomer, because there were several different protocals used, depending on the ECM, as well as the mask. Some used $OD, some are $OE, all with the same ECM. If we assume this is a 747 ECM, you can buy a cable from MOATES, which is your best bet. Yes, you can build one, which I have done, but then you still need to convert from serial to USB. NOT ALL ADAPTERS WILL WORK. The snag you run into is that the baud rate for late OBDI is 8192. This does not match the PC standards of 9600, 19200 ect. 9600 sort of works, but some USB to serial adapters don't like it. Ironically, the cheaper adapters don't care. Either way, unless you have a real serial port, the best thing to do is just buy a working cable from MOATES.

The second thing to do, is download TUNERPRO. Download the definition file for your specific ECM, and you can see everything you ever wanted to know.
__________________
2004 AllegroBay 34XB Nov 2017 Banks, Front & Rear Trac bars, Konis
Sold:'83 Revcon Prince 31' FWD GM Performance 502 w/Edelbrock MPFI, Thorley Tri-Ys & Magnaflows, 4L85E 4 spd
Daveinet is offline   Reply With Quote
Old 09-08-2018, 10:40 AM   #12
Member
 
NormD's Avatar
 
Winnebago Owners Club
Join Date: Jul 2011
Location: Beaverton, Oregon
Posts: 48
SUCCESS! The $5 Torque app, along with the $15 ELM327 OBD2 dongle I already owned, reads out the fault codes on pin 2, the J1850 variable pulse width bus. This did not work with the free version. I have not explored very far on the real time displays. RPM and coolant temperature are available, but are already displayed on my instrument panel.
I am very pleased with the results. Thank you very much, Skip426, for all your time spent hunting for a solution to my problem. It's folks like you that make this forum work so well.
Thank you, Daveinet. I bought the Torque app before I read your posting. I will look at TUNERPRO, too.
__________________
2001 Winnebago Brave SE 26P
Workhorse, P32, 7.4L
2000 chassis, SuperSteer springs
NormD is offline   Reply With Quote
Old 03-17-2019, 08:48 PM   #13
Junior Member


 
Join Date: Feb 2019
Location: tucson
Posts: 17
Quote:
Originally Posted by NormD View Post
I am sure many of you are aware that Workhorse used a hybrid OBD2 readout on their chassis around year 2000. It is sometimes referred to as OBD 1-1/2. Has anyone found a way to get information out of this OBD2 socket? So far, the only advice I've heard is to "take it to a dealer."
HI !Just saw this post, I have a old rv and p/u, and it uses obd1, BUT maybe this can help you, youtube has alot of vidios on this subject!! One guy you can search is SCANNER DANNER /trouble codes! hope it helps
THOMAS10 is offline   Reply With Quote
Old 03-22-2019, 06:48 AM   #14
Senior Member
 
boatman10's Avatar
 
Join Date: Oct 2015
Location: northeast florida beach
Posts: 245
geez if I ever thought about paying 250$ for a scan tool it would be a knockoff Tech2 like Kevin bought....$239 on ebay.....then you can access all sorts of GM stuff and real time graph it....and even reprogram stuff.
__________________

__________________
Florida Scott
2001 R Vision M242 25' 8.1L GM Workhorse
boatman10 is offline   Reply With Quote
Reply



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
"Building" your own "Home Base" on "Your Property"??? Wundertaker Full-Timers 51 08-27-2018 10:07 PM
A "Camper" is a "Camper, and a"Trailer" is a "Trailer"! OHVtime iRV2.com General Discussion 31 10-22-2017 07:57 AM
Good Sam Extended Ins. "Read the Fine Print" mwwade iRV2.com General Discussion 7 05-02-2016 09:06 PM
"New Posts," "Today's Posts" and "List Subscriptions" Not Current l1v3fr33ord1 Forum 101 | Announcements | Member Forum Concerns 3 02-23-2016 06:28 AM
"Read Volts" display RetiredBob Newmar Owner's Forum 9 02-01-2011 07:09 AM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:03 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.