1997 ATC DIAGNOSTICS - Page 2 - 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 03-21-2006, 02:22 PM   #11
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It seems that after a battery change the ECC may take a while to reset itself, so this may go away by itself. If not, the codes can only be read by a "Tech 2" scanner that the dealer has.

However, so far, what I've found for the '97:
Quote:
Originally Posted by Echo SSEI
the calibration info for you. It is basically set the ECC to full heat and move Airmix door actuator to full right. Then there is a system of temperature tests to run and get it calibrated.
Quote:
Originally Posted by Echo SSEI
The HVAC programmer contains self-diagnostics. When a fault is detected, the dispaly panel will flash indicating a diagnostic trouble code (specific to the HVAC programmer) has been stored. These codes can be read and cleared only with a "Tech" scanner.

But there is some good news...

If you don't want to take it to a dealer or you don't have access to a scanner that is capable or reading and clearing the HVAC codes, then...

Any codes in the HVAC programmer memory are cleared AFTER 50 drive cycles without a reoccurance of the code.

Having said that, if you get hot and cold, and the air is coming out of the vents that you selected, at the fan speed you want, you don't HAVE to fix it.

Do a search on "ECC" in the 92-99 Mechanical section for more detail.
You should really read this whole thread, or at least the 2nd and 3rd pages. There is a lot of information here for you.

ECC Diagnostics Info
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Old 03-21-2006, 05:31 PM   #12
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97 SSE, can you not type in caps? It'* seen as yelling on an internet forum. Also, if you put your year and model (97 SSE) in your signature, it'll help in the future. Your signature is where we typically look for your car information, and your username may be overlooked.
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Old 03-21-2006, 07:17 PM   #13
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i can get the air coming out of the vents that i selected, at the fan speed that i want, but hot and cold is a problem. i can get hot and cold, but not on demand.
if i go from min to max on the temperature switch i may get more heat. then if i go to min temp i may get cold.
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Old 03-21-2006, 08:08 PM   #14
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Did all this start after you changed the battery, or did you have problems before then?
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Old 03-21-2006, 08:22 PM   #15
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It all started after the battery was replaced.
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Old 03-22-2006, 12:29 PM   #16
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Quote:
Originally Posted by 97-SSE
It all started after the battery was replaced.
Hmmmmm....odd....

Sounds like an airmix door actuator, but I wouldn't think that replacing the battery should have affected that. I'll look in the books when I get home to see what I can find.
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Old 03-22-2006, 12:44 PM   #17
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I have the same problem after I disconnect the battery (I think there was at least one other report of this). Eventually, the flashing goes away and the heat starts working fine.

I would look at the air mix door to see if it is moving (fully) when the temp is changed.
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Old 03-22-2006, 12:49 PM   #18
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Quote:
Originally Posted by 97-SSE
It all started after the battery was replaced.
Did you get a chance to read the thread I linked above?
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Old 03-22-2006, 02:52 PM   #19
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i did read the thread you linked. I have a better understanding of the ecc system, but i think i need to find someone with a tech2 scanner.

thanks to everyone for your help on this problem
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Old 03-22-2006, 03:41 PM   #20
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Quote:
Originally Posted by 97-SSE
i did read the thread you linked. I have a better understanding of the ecc system, but i think i need to find someone with a tech2 scanner.

thanks to everyone for your help on this problem
Sorry, we weren't much help. It is true that the only way to get the code from the flashing ECC is using a tech scanner. I and others have had our ECC'* flashing, made repairs and have had the flashing go away after the problem had been fixed. If you are having problems with heat/cold, then you do probably have an issue. I am still going to research the factory manuals to try to find an indication why changing the battery might have caused a problem. If you get it scanned, please let us know what you find out.
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