How to read OBD 1.5
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Joined: Aug 2006
Posts: 60
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From: Kansas City Mo
How to read OBD 1.5
Does anyone know how to read an OBD 1.5. I thought i had the ODB-II, but think it is the OBD 1.5. I have a 94 coupe with a 16-pin connector. I took it to autozone and orielly's and neither could read it at all. I took the car to the chevy dealer for other work and they read it fine they said.
Melting Slicks
Joined: Feb 1999
Posts: 3,261
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From: sonoma ca
You shud be OBD I. I've never heard of I.5.
My 95 is OBD I with some OBD II parameters. It was just prior to the changeover to OBD II & they wanted to test some functions I guess?
Didn't the dealer tell you which you have? I feel quite sure you are OBD I.
My 95 is OBD I with some OBD II parameters. It was just prior to the changeover to OBD II & they wanted to test some functions I guess?
Didn't the dealer tell you which you have? I feel quite sure you are OBD I.
Last edited by Red Dwarf; Jun 13, 2008 at 05:45 PM. Reason: more info
Safety Car
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From: FL
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You can use a clip and connect ports 4 & 12
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
A/Z sees that big old connector and goes right for the OBD2 scanner mainly because of lack of in depth knowledge.
Also on board diagnostics will not show any OBD2 embedded codes if one is set. It can only be seen with something like a Tech1 unit which was designed for GM dealers.
Best thing to do is use on board diagnostics as described above. It will tell you all you need to know
Last edited by pcolt94; Jun 13, 2008 at 11:02 PM.
Instructor
Joined: Mar 2008
Posts: 111
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From: York PA
[QUOTE=pcolt94;1565891968]Absolutely right. The 94-95 have OBD2 connectors but you have to test with OBD1 unit. The software and protocol is OBD1 and if you connect a OBD2 unit to it will not establish communications.
A/Z sees that big old connector and goes right for the OBD2 scanner mainly because of lack of in depth knowledge.
Also on board diagnostics will not show any OBD2 embedded codes if one is set. It can only be seen with something like a Tech1 unit which was designed for GM dealers.
I dont know about the 94 but I can get a connection with an OBDII scanner on my 95 and read codes that have been set. It also shows engine info while it is running. Im sure I can not see everything that is going on, but it does show a good bit of information from rpm's to O2 activity.
A/Z sees that big old connector and goes right for the OBD2 scanner mainly because of lack of in depth knowledge.
Also on board diagnostics will not show any OBD2 embedded codes if one is set. It can only be seen with something like a Tech1 unit which was designed for GM dealers.
I dont know about the 94 but I can get a connection with an OBDII scanner on my 95 and read codes that have been set. It also shows engine info while it is running. Im sure I can not see everything that is going on, but it does show a good bit of information from rpm's to O2 activity.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
I dont know about the 94 but I can get a connection with an OBDII scanner on my 95 and read codes that have been set. It also shows engine info while it is running. Im sure I can not see everything that is going on, but it does show a good bit of information from rpm's to O2 activity.
I believe the 95 is a bit more OBD2 advanced that the 94. But was not aware that it could establish OBD2 communications, maybe it’s different. Anyway would sure like to here more from others on this.
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Burning Brakes
Joined: Apr 2006
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From: Houston Texas
Some (most) OBD II scanners can read OBD I computers through the OBD II connector. They cost more than $100 though, more like $300.
Actron is one. They have adapters to use on older 12 pin connectors that need external power.
Actron is one. They have adapters to use on older 12 pin connectors that need external power.
Last edited by Eddie & the Cruisers; Jun 15, 2008 at 12:09 AM.
