1997 ATC DIAGNOSTICS - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-22-2006, 03:45 PM   #21
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I think I remember Nick performed service that required the battery to be disconnected. Then it started flashig when he hooked it back up.

Hmmm off to look for that thread.

EDIT: Not sure that this will or won't help. Hoping it will. Lots of good stuff to learn and maybe look at

http://www.bonnevilleclub.com/forum/...43362&start=40
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Old 03-23-2006, 10:14 AM   #22
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1. External temp sensor fault
2. Internal temp sensor fault
3. Solar sensor fault
4. Air mix door fault
5. Heat/AC contol panel fault
6. Loss of "keep alive memory" in HVAC programmer
7. Loss of serial data

can anyone explain item 6. how do you acquire "keep alive memory" if you have lost it?

can anyone explain item 7. what is serial data

i disconnected the battery this morning. i'll reconnect it later today and see if anything changes
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Old 03-23-2006, 10:16 AM   #23
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Not sure on either, would need to look them up and don't have manuals handy.

I believe after 50 run cycles you would be all set for keep alive memory. 50 cycles can be a long time though.
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Old 03-23-2006, 10:20 AM   #24
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Quote:
Originally Posted by BillBoost37
I think I remember Nick performed service that required the battery to be disconnected. Then it started flashig when he hooked it back up.

Hmmm off to look for that thread.

EDIT: Not sure that this will or won't help. Hoping it will. Lots of good stuff to learn and maybe look at

http://www.bonnevilleclub.com/forum/...43362&start=40
That'* the same thread I linked for him earlier....
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Old 03-23-2006, 10:33 AM   #25
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I did some reading up in the manuals last night. I was specifically looking for any information about loss of battery power. The only thing I found was a warning to not have the key in the "on" position while disconnecting or reconnecting a battery. I assume this could result in possibly resulting in 6 or 7 above.

6 and 7 are usually the result of a short or bad ground or bad HVAC programmer. 7 specifically has a link to serial data bus E & C.

There are a series of tests to run if you have 6 or 7, but I don't have the manuals with me. If I recall, though, the tests involve checking for shorts and the programmer itself.

Also, there is a air mix actuator recalibration procedure that I will post for you.
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Old 03-23-2006, 11:40 AM   #26
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the morning the battery went dead, i tried to start the car, and when turning the key to start, there was'nt enough power to turn the engine over. i tried to jump start it with my grand prix. could'nt get enough current through the jumper cables. then i though corrosion on battery terminals. when removing positive cable, the positive cable and positive post came off the battery. the key may have been on. there was corrosion on the positive cable.
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Old 03-23-2006, 11:49 AM   #27
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But I thought you said you changed the battery? Was it not a new battery?

Anyway, put in that new battery and the new battery cable (the one that was corroded). Then after a couple days, maybe the ATC flashing will go away. Maybe not though, if you really have a heating/cooling issue.
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Old 03-23-2006, 01:55 PM   #28
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i did put a new battery in
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Old 03-23-2006, 02:54 PM   #29
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OK, so help me to understand here. You put in a new battery, which caused (or seemed to cause) the ECC problems. Now you have a badly corroded positive terminal that came out of the battery and a corroded positive cable. These two are new issues that occurred since putting in the new battery. You think you left the key on, which killed and corroded the battery and cable.

Please bear with me, as I am trying to understand what is happening and am confused as to the full sequence of events. Is my understanding of events as typed above correct or what did I miss?
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Old 03-23-2006, 03:35 PM   #30
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1. the morning the battery went dead

2. i tried to start the car, and when turning the key to start, there was'nt enough power to turn the engine over.

3. i tried to jump start it with my grand prix. could'nt get enough current through the jumper cables.

4. then i though corrosion on battery terminals.

5. when removing positive cable, the positive cable and positive post came off the battery. (the ignition may have been in the on position when the positive post seperated from the battery)

6. there was corrosion on the positive cable.

7. Replaced battery and cleaned battery cable ends.

8. ecc has been flashing ever since

sorry for the confusion
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