Obviously, I have a 1995 LT1 car and have suddenly realized that I do not know if it's an OBDI or an OBDII. Here's what has led to my confusion:

I have the OBDII connector under my dash.

I searched this board and found that some people believe that ALL 95 cars were OBDI with the OBDII connectors. I find this hard to believe, as I work in the automotive industry, and with any model year option switchover, we generally try to switch late in the previous year as soon as we're ready, so that we don't miss the model year changeover date. To shoot for January 1 would almost be suicide, as something always goes wrong and delays switchovers.

I searched this board and found that some people claim that they have a '95 car with an OBDII system.

I have the Factory GM Service Manuals, and they make no mention of any difference between OBDI and OBDII for the '95 model year, but refer to the OBD as an 'On Board Diagnostic System' in general, so they could be talking about either I suppose. When discussing how to retrieve trouble codes and diagnostic information, they show both the OBDI 12-pin connector, and the OBDII 16-pin connector. They don't say WHY both connectors are shown, but in the following pages they mention that the Tech1 scan tool may need a 12-pin to 16-pin adapter for 'some models', keeping in mind that my Service Manual is for 1995 only.

On the emissions sticker under the hood of my car, it says "OBDI Certified." I don't know if this is solid proof of an OBDI system, or if it is only certified to OBDI specs because that's all it had to pass for a 1995 model car.

Nothing in the VIN tells you if it's a I or a II.

My car has a single cat, and if I remember right, the OBDII cars had dual cats... Is this true, and if so are there other dead giveaways that it's an OBDII system???

I await your Wisdom!

Paul 'X'

 

Well, an OBD2 car should have a crank position sensor as well as O2 sensors after the cats. So if you're missing those, I'd say you've probably got an OBD1 car.

 

if you have a single cat, then its obd1. 96 and 97 were the only years of obd2 from what i know, they had dual cats, and a crank position sensor, and a different knock sensor.

 

You have the same car that i do.... An obd-1 with a obd 11 connector..... its not that hard to believe. I first realized this when i bought my LT1 Scanmaster, it said that the connection methods are the same for the 95 as for the 96 and 97 because most 95's have the obd 11 connector......


Chris

 

All 1995 LT1 F-bodies are OBD-I

Believe it.


Your emissions sticker says OBD-I. It's OBD-I.

Counting the cats is not proof of I or II on a 1995 LT1 F-body. If you have 2 cats on a 1995 LT1 F-body, it means it was equipped with California emissions. Single cat cars were normal Federal emissions equipped.

You have the OBD-II shaped connector under the dash. That does not make it OBD-II in this case.

If you look at your service manual when you get the to Diagnostic Trouble Codes for the LT1, does it list OBD-II codes? No. Why? Because it is OBD-I.

Want to be more confused? The 3.8 V6 added during the model year in 1995 was OBD-II.

 

Try hooking up an obd2 scanner to it and see what happens
That's what I did when I first got my car...oops.

I think the California cars were obd2 in 95, v6 & lt1- I know the LT1s got dual cats anyway.

 

They weren't. Trust me.

 

I have a friend that has a 95Z that had 2 cats and was built under california restrictions.. and yes it was a 95.

early 95s' had obd1 Later that year they had obd 2 but both used obd 2 port to conect

 

Mine has/had only 1 cat, the 16(?) pin connector and is OBD I.

 

There are numerous people on this board that have dual cat 1995s that are OBD-I. That is not a fact that is in doubt.

No one has ever come up with an OBD-II, 1995 LT1 F-body. There is no factory service documentation that says there ever was one. Only myths and rumors.

This arguement goes on every time there is a post like this started.

 

he-he y'all need to learn not to doubt anyone whos sig consists of F-body tech links ....

 

I bought an Actron OBDII scanner yesterday that I have not opened. The good folks at AutoZone assured me that it would read OBDI codes as long as it had the OBDII connector. I doubted that, so have not opened it.

Is it possible that they were telling the truth and the Actron reads both OBDI and OBDII codes? It doesn't seem like a huge stretch of the imagination considering the OBDI codes have been around forever and wouldn't be so complicated to add to a scanner.

Aside from that, how do I get the damn codes out of it? I don't see the OBDI connectors being directly 'mapped' to donnections in the OBDII connector, so that I could just use a paper clip like in the old days... I used a link from shoebox's sig to go to the image from the GM manual where it shows both OBDI and OBDII connectors, but like I said the connections don't have the same destionations...

So how do I get the codes out of my OBDI car with an OBDII connector????????

 

I would say that you should take that scanner back it is not going to work, since I am sure the pinouts don't match...the vast majority of people that work at autozone are total idiots, and that is an understatement.

Get a cable and some software for your laptop. There is a lot of free and demo software out there.

Check out this site

www.akmcables.com

I bought a cable from him and works great. 95z with obdi and obdii connector.,

 

My Laptop???

Do they sell a 50-foot cable so that I can hook it up to my desktop and run it out the window to my car?

Actually I may as well in vest in a laptop and LT1 Edit because next summer I'm planning major mods next summer anyway... I'm guessing an outdated, used, cheap laptop will do?

 

my car is a california car with a single cat. ? its also a 95 z28 and no problems with smog?