Two OBD2 plugs
Thread Starter
Racer
Joined: Jul 2007
Posts: 313
Likes: 0
From: Laurel MS
Two OBD2 plugs
On my 94 the previous owner severed the wiring on the original data input plug and wired in an apparently newer plug. Any advantage here? Understand the 94 had early OBD II capability and later OBD II tuner/readers weren't compliant with earler system, only 1996 & newer.....right or wrong???
Last edited by jim_hewett; Sep 10, 2008 at 06:04 AM.
Thread Starter
Racer
Joined: Jul 2007
Posts: 313
Likes: 0
From: Laurel MS
On my 94 the previous owner severed the wiring on the original data input plug and wired in an apparently newer plug. Any advantage here? Understand the 94 had OBD I capability and later OBD II tuner/readers weren't compliant with former system, only 1996 & newer.....right or wrong???
Last edited by jim_hewett; Sep 10, 2008 at 06:38 PM.
Instructor
Joined: May 2008
Posts: 191
Likes: 0
From: Saginaw TX
St. Jude Donor '09
The 94 & 95 vettes had the newer OBDII connector, but were still using the OBDI system. An OBDII scanner will not work.
Last edited by jrogensk; Sep 10, 2008 at 11:24 AM. Reason: spelling
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
Who knows what he has re-wired but if I would have to take a guess I would have to think he wanted to use a OBD1 scanner. He might have tried to revert back to the kind of plug that was used on the 93 and earlier vetts.
You see you can’t buy a OBD1 scanner with the OBD2 connector. Only a Tech1 (or 2) can handle that configuration. If you went to buy a scanner for it they would sell you a OBD2 scanner which does not work. There are imbedded OBD2 codes but you need to use a Tech1 (or comparable unit) to retrieve the codes. However I feel they are probably pretty useless and would just forget about them.
The on board diagnostics works great. Tells you what code is in what module. That is more info that some scanners might tell you. But you got to figure out which pin to ground. Get the complete information and books for it, it’s a great tool for free.
You see you can’t buy a OBD1 scanner with the OBD2 connector. Only a Tech1 (or 2) can handle that configuration. If you went to buy a scanner for it they would sell you a OBD2 scanner which does not work. There are imbedded OBD2 codes but you need to use a Tech1 (or comparable unit) to retrieve the codes. However I feel they are probably pretty useless and would just forget about them.
The on board diagnostics works great. Tells you what code is in what module. That is more info that some scanners might tell you. But you got to figure out which pin to ground. Get the complete information and books for it, it’s a great tool for free.
Le Mans Master
Joined: Apr 2005
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From: The Old Dominion
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
