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1995 Chevy Lumina OBD 1 OBD 2 !

Tiny
MY70CHEVELLESS
  • MEMBER
  • 1995 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 11,054 MILES
Good afternoon
I have a 1995 Chevy Lumina APV with the 3.8L V6. My check engine light has been coming on for a while now but now she is starting to run rough.
I looked under the hood on the emission sticker & it says OBD1 so I figured I would jump the A & B terminals to get the codes.
When I went under the dash the A terminal was there but no B terminal there are only three pins the A top right one under it & another on the botom.
Now it looks like an OBD1 connector the emission label says OBD1 but there is no b terminal.
So my question is can I jump this & if so what pins do I use.
I have been looking for a code reader but everyone I have seen says 96 & latter $69. Not bad then I found one that reads both OBD1 & 2 this is $200. A little much.
Thank you for your time & help!
Will.
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Wednesday, March 17th, 2010 AT 3:15 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, do you have 16 pin datalink connector? If so, MOD says to use jumper on pins 5 & 6, FOR MIL CODES.


https://www.2carpros.com/forum/automotive_pictures/170934_lumina_apv_1.jpg



Then you turn key till dash lites come on, no further. The mil starts flashing, you count the flashes to get the codes.
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Wednesday, March 17th, 2010 AT 3:37 PM
Tiny
MY70CHEVELLESS
  • MEMBER
  • 2 POSTS
Good Evening,
No it has the 12 pin ALDL this is what I can't understand as the A pin is top far right the B pin should be right next to it but it is empty.
In the past this is how I use to jump the OBD1 A & B.
Having said that I checked out a code reader for OBD1's but when I read the manual it said the only 95 Chevrolet it will check is the Caprice 4.3L.
It went on to say even though some 95's had the 8-12 pin connector it was a diffrent ECM used!
This code reader was only $30.
So do I have to buy one that checks both OBD 1 & 2's at $200. I just don't get why it says under the hood OBD 1 no B pin & now I read diffrent ECM.
Thank you for your help!
Will.
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Wednesday, March 17th, 2010 AT 6:55 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I wouldn't buy anything, unless I was positive, it would work on your vehicle. Some hybrid diagnostic systems are called OBD1 1/2, I just don't have anything on it.
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Thursday, March 18th, 2010 AT 9:28 AM

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