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Author Topic: OBD II code retrieval and decoding  (Read 13057 times)

Offline gunrac

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OBD II code retrieval and decoding
« on: February 26, 2016, 06:37:44 am »
 Is there a way I can retrieve my OBD II code w/o going to the parts store? Plus, looking for a decoding chart.
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Offline Irish_Alley

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Re: OBD II code retrieval and decoding
« Reply #1 on: February 26, 2016, 06:45:33 am »
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Offline zieg85

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Re: OBD II code retrieval and decoding
« Reply #2 on: February 26, 2016, 06:49:19 am »
Not that I could find after exhaustive search.  Santa had one for me under the tree several years back.  As far as codes found, I just Googled the POxxx for the specific year and model and was surprised to find similar problems for a similar vehicle and how they fixed them.  Good luck, Vile has helped me on a couple of occasions where it was beyond research.
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Offline gunrac

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Re: OBD II code retrieval and decoding
« Reply #3 on: February 26, 2016, 06:56:32 am »
Yes, I hit the search in here and found the OBD I, also done the google w/o insite. I did see where a Dodge has a quick retrieval process, nothing on the Chevy tho.
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Offline gunrac

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Re: OBD II code retrieval and decoding
« Reply #4 on: February 26, 2016, 07:30:31 am »
OK.....I was under the impression that the OBD II, started in 92'. After another google, I read the OBD II didn't come in till 96'. I don't consider this as confirmed. I'm dealing w/my 94'. Can someone give me the proper confirmed dates on the changes. All help is appreciated...... 
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Offline Irish_Alley

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Re: OBD II code retrieval and decoding
« Reply #5 on: February 26, 2016, 07:36:58 am »
its hit and miss in 94 but was standard by 96
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Offline Irish_Alley

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Re: OBD II code retrieval and decoding
« Reply #6 on: February 26, 2016, 07:38:31 am »
if your plug looks like

then its obdI

if it looks like

then its obdII
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Offline gunrac

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Re: OBD II code retrieval and decoding
« Reply #7 on: February 26, 2016, 08:03:37 am »
THX.........I haven't looked yet, but that will help me to figure it out quickly.
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Offline hatzie

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Re: OBD II code retrieval and decoding
« Reply #8 on: February 28, 2016, 01:11:24 pm »
The rounded corner trapezoid shaped J1962 jack is not just OBDII.  GM used it in late 1994 & 1995 on ALDL ECMs. Vendor Option terminal 9 on the 16 terminal J1962 (OBDII) jack was used to pass the 8192 baud serial data normally found on terminal M of some 12terminal ALDL jacks.
I had a 1995 6.5L truck.  I added a 12 terminal Metripack ALDL jack with A, G, & M populated from J1962 jack  5, 16, & 9 respectively.  I put it next to the J1962 jack.

The pinout of the 12 terminal Metripack ALDL jack varied by year and GM nameplate.
This is my writeup on options for monitoring and reading codes from ALDL http://forum.73-87chevytrucks.com/smforum/index.php?topic=32624.0

Obviously a GM Tech II or MDI will give you the most information and they are bi-directional meaning you can send commands to controllers but we mere mortals can't afford those.

The same inexpensive laptops I wrote about for ALDL will work with $50 USB OBD II interfaces or you can use TorquePro on an Android phone or tablet with a Bluetooth adapter.

Some of the cheap Actron OBD handhelds are actually OK tools.  If all you want is to pull OBD II codes and swap parts get a cheap handheld scanner.  Some handheld scanners will read and show some sensor data.

BTW: People call ALDL OBD I.  That is not correct.  OBD I is California only between 1991 & 1995.  ALDL is not OBD I but GM OBD I is ALDL.
« Last Edit: February 28, 2016, 09:42:52 pm by hatzie »
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Offline VileZambonie

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Re: OBD II code retrieval and decoding
« Reply #9 on: February 28, 2016, 05:28:44 pm »
Quote from: gunrac on February 26, 2016, 07:30:31 am
OK.....I was under the impression that the OBD II, started in 92'. After another google, I read the OBD II didn't come in till 96'. I don't consider this as confirmed. I'm dealing w/my 94'. Can someone give me the proper confirmed dates on the changes. All help is appreciated......

so now you know it's not OBDII but why don't you tell us specifically what you are working on?
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Offline gunrac

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Re: OBD II code retrieval and decoding
« Reply #10 on: February 29, 2016, 07:45:53 am »
I got under yesterday.
Quote from: Irish_Alley on February 26, 2016, 07:38:31 am
if your plug looks like

then its obdI

Quote from: Irish_Alley on February 26, 2016, 07:38:31 am
if your plug looks like

then its obdI

Mine resembled this, but I think where the pin's appeared was a bit different. Will get under again today and get back w/a better description.
I did jump the A an B, it worked accordingly as described by Irish.  I came w/a code 32. Not sure on this code as it is a new EGR that past the suction test before assembling. Light only came on after around 10mi. run. Then didn't come on the next day until it got to good running temp. This happened 3 days in a row.
Timing was finally set. It was a bit  retard, as I could see the timing line just below the v-notch at start up w/advance wire unhooked. Went ahead and reset ECM/PCM. Have a 20mi. run today......will see if light shines again today.
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Offline gunrac

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Re: OBD II code retrieval and decoding
« Reply #11 on: February 29, 2016, 08:54:13 pm »
Dang lite came on......code 32 again.......I don't know? Pic of my feed.....what do I have.....+ help on the code.....
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Offline gunrac

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Re: OBD II code retrieval and decoding
« Reply #12 on: February 29, 2016, 08:57:50 pm »
callin my a to b......right top to left
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Offline VileZambonie

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Re: OBD II code retrieval and decoding
« Reply #13 on: March 01, 2016, 06:01:38 pm »
Quote from: VileZambonie on February 28, 2016, 05:28:44 pm
Quote from: gunrac on February 26, 2016, 07:30:31 am
OK.....I was under the impression that the OBD II, started in 92'. After another google, I read the OBD II didn't come in till 96'. I don't consider this as confirmed. I'm dealing w/my 94'. Can someone give me the proper confirmed dates on the changes. All help is appreciated......

so now you know it's not OBDII but why don't you tell us specifically what you are working on?

Is it a secret or did I miss it? What are you working on?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline gunrac

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Re: OBD II code retrieval and decoding
« Reply #14 on: March 01, 2016, 09:43:32 pm »
Thought it was mentioned......1994 Chevy Cheyenne W/T package, 305/700R ......really need help.......new EGR , cleaned out a lot of crap in manifold, when doin valve job   ....what do I need to look at now?
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