Replaced O2---> still getting DTC13 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-11-2005, 09:11 PM   #1
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Default Replaced O2---> still getting DTC13

My SES light used to be intermittent but recently has been coming on almost 100% of highway dtiving. The only code present in the PCM was 13. I changed the O2 with a Delco unit and took it for a quick 3 mile drive. No light. I decided to try the highway and sure enough just as I entered, the light came on.

Reading the manual I find the instructions to connect to a tester which I do not have so I'm looking for some other ideas. I see the O2 ground is suppose to ground at the "trans stud". I'm a little lost on that location.
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Old 04-11-2005, 09:42 PM   #2
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I thought that the O2 was grounded through the exhaust pipe itself?
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Old 04-11-2005, 09:54 PM   #3
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The diagram shows PCM pin BD3 goes to the purple wire of the O2 and pin BD2 is the ground for the O2. It is basically a ground reference right at the PCM not at the sensor.
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Old 04-11-2005, 10:03 PM   #4
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Quote:
Originally Posted by randman1
The diagram shows PCM pin BD3 goes to the purple wire of the O2 and pin BD2 is the ground for the O2. It is basically a ground reference right at the PCM not at the sensor.
Make check your PCM'* ground?
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Old 04-12-2005, 06:24 PM   #5
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I did some more testing today. Continuity and resistance tests. I could find no abnormal results. I also used a Dremel and wire brush attachment to clean all the ground terminals, mounts, star washers and nuts for the 4 grounds under the hood and the one in the right kick panel. Although this helped lower the resistance to the ground terminals to the PCM, it did not solve the SES light problem.

This points to the PCM as the culprit. I noticed a refurb sticker on the case so that is probably the last nail in the coffin for that damn thing. Any other suggestions before I look for a new PCM?
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Old 04-13-2005, 03:16 PM   #6
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The problem has been resolved. A PCM swap did the trick.

I did learn something today too. The guy at the junkyard gave me a list of compatible vehicles that are supposed to have the same PCM. I questioned the list when I saw the Lesabre and Trans Sport on there too. He said that it didn't make a difference whether it was an L67 or L27. I really thought this was a crock of dung but went ahead and grabbed one from a 93 Olds LSS with a VIN code of "L".

I came home and realized that the PCM I already had from the parts car has the same service code as the one from the LSS. I figured I'd give it a shot and what do you know, it works fine. All I had to do was change the chip.
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Old 04-13-2005, 03:44 PM   #7
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Glad you got it fixed. That could be a pesky one to solve. PCM'* are widely universal in a block of years (or PCM types) across vehicles. The Eprom is the specific thing from model to model.

How much was the new PCM?
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Old 04-13-2005, 03:52 PM   #8
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Those PCM'* can be tricky...

All of the 3800 L67 & L27'* with the 4T60-E will have the same PCM...( 92-93 ) as early as 91 for some models...

The L27, L67, and L36 with the 4T60-E for 94-95 will all use the same PCM as well...

Keep in mind that 92-93 was the OBD1 version...

94-95 was the Hybrid OBD1, with OBD2 codes... LOL

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Old 04-13-2005, 05:17 PM   #9
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Quote:
Originally Posted by willwren
How much was the new PCM?
Only $20. The place in Worcester is Linder'* and directly across the street is Sams U Pull or something like that. I believe they are under the same ownership. The newer parts are removed and inventoried at Linder'* and the remains and older models are picked apart across the street. It would have been $60 had I not wanted to pull it myself.

Yea Don, those PCMs are tricky. He gathered that information from his computer and said that it was very reliable. I'd love to get my hands on THAT software. Know anyone that works/owns a boneyard?
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Old 04-13-2005, 06:57 PM   #10
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Not personally, But man I'd love to have that data too...

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