RedZR

Gang,

Do MY95 LT1s use OBD II ?

Thanks,
Dan

rsafier

nope, but does have a ODBII style connector.

RedZR

Thanks, mystery solved.

My brother in law purchased a 95 this weekend and I tried to hook my scanner up to it and the plug in was different than my 91s. I thought something was fishey because it has the OBD2 plug in but had only one o2 sensor per side.

Are the chips in 95s replaceable or do you have to reflash the ECM?

Dan

rsafier

flashable, very easy with TunerCat. I do it on my 94.
$EE bin file

You might be able to use your cable, just make a patch for the new data pins. Everything is the same except the connector.

MostWanted

I was told that the dealer was the only one who could check my "SYS" codes on my OBD-II Vette. I went to the dealer and he told me how to ground the connector to read the codes on the dash. Go figure.

SilverBeast

According to GM, some of the last 1995s to be manufactured had OBD-II installed. They are rare, but they do exist.

96GS#007

The codes you're checking are CCM codes and they do in fact relate to the "SYS" you'll see flash on the IP display if there is a code stored.

The advice you received was in reference to PCM codes (i.e. the Service Engine Soon light). To check PCM codes (note the "P" for powertrain) you must use a scanner (i.e. a Tech 2 or equivalent) or scan software loaded on a laptop (i.e. AutoTap or equivalent) on a '96. OBD II diagnostic codes are 5 characters long (Pxxxx) and can't be displayed on the 3 character '96 speedometer display.

Hope this clarifies things.


[Modified by 96GS#007, 11:56 AM 6/16/2004]

MostWanted

Roger that 96GS. When I was trying to figure out how to check for codes relating to the "SYS" light...I was told to go to the dealer for this due to my car being OBD-II. My mechanic used his scan tool to get the codes for my "Service Engine Soon" light but he, along with the guy at the autoparts store did not know about the "SYS" light. You can read my post about my "SYS" light here: http://forums.corvetteforum.com/zerothread?id=839360 I am clear about what your post said...I just don't think others are clear about it since it is an OBD-II car. I hope this clears up what I was talking about. Later 96GS!


[Modified by TorchRedXCVI, 10:06 PM 6/19/2004]

mvitacco

'95 LT1's have OBDII hardward running OBDI software.

mrvideosawyer

I guess I must be little slow and dense - I have a 95 LT1 with an OBD2 connection - what can I do to read codes - I tried to plug in a OBD2 scanner and it would not recognize it was attached. The only reason I was trying to read codes was that my "SERVICE RIDE CONTROL" light came on -

Any help on these issues?
Jim Sawyer

rodj

Because as mentioned above , '95 has OBD1 software even though a ODBII plug is fitted

http://www.corvette-guru.com/uploads...CMCodePull.pdf

mrvideosawyer

Thanks for information - I read it and it seemed like it could be helpful - but it the information given says it (the code reading process) only works up to a 1993. Will it work on a 1995?
Thanks in advance
Jim "codeless in Seattle" Sawyer

mrvideosawyer

when inserting paper clip into obd connector does the paper clip stay in when doing the code reading - or is it a touch (shorting out) type action?

I know it is a basic question but I just want to make sure before I start plugging in paper clips into sockets.

Thank you for helping in advance
Jim Sawyer

vette079

take a small type paperclip, and if you know wich slot you have to use, see to it that it stays in there, no touch.
I prefer a small flat/male wire connector (2) with a piece of wire (5 inch) between em.
IMO paperclips can ruin the female connector in the ALDL.

The only thing you´re doing is closing the path for the diagnostic part of the PCM, some stuff though can only be shown with a scanner.

mrvideosawyer

Thanks for the help - I am still new at this and I look to forum for advice.
Jim

vette079

I have an autoXray 6000, but I can´t remember if it came with a GM OBDII cable.
That one should be able to read both OBDI and II.

Christi@n

How? Can you explain to me too?

James93LT1

http://tech.corvettecentral.com/2011...trouble-codes/

Cliff Harris

For 1994 through 1996 cars, check this link:

http://forums.corvetteforum.com/c4-t...n-96-cars.html

Cliff Harris

That link is dead. It appears the site corvette-guru.com has ceased to exist.

I searched for CCMCodePull and found several references to:

http://www.c4guru.com/articles/ccmcodepull.pdf

That link doesn't work either. I didn't find the article with the Wayback Machine. It appears to be gone forever unless somebody has it archived somewhere.