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NO ECM Data


sehrhardt2
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Walt,

By all means, grab the ECM'S or at least the MEM-CAL modules inside the ECM (remove two scews & cover and release pluggable oblong module with light blue cover). Keep in mind that even if the cars are in California now, they may have originated elsewhere so may or may not have CA version PROMS.

Dave, sounds good. These are getting harder to find and I imagine many have already been crushed if the ECM's weren't claimed before the yard junked the car. AFAIK, none of the Reatta MEM-CALs are available new unless there is NOS sitting somewhere (which is possible although unlikely at this point). As stated, no 88 parts found at all in the GM dealer network as I had a nationwide search done at the time. Don't know about 89-91.

Bottom line, right now if you have a bad or missing PROM you are most likely at the mercy of the used parts market, or finding someone who can program a new chip and graft it into an existing MEM-CAL. I did the latter with my first 88.

I will be doing a new one for Threatta as well, with 180º fan setpoint to run the engine a bit cooler (thanks goes again to Padgett for that handy patch).

KDirk

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Actually, NOS EPROMS are still available at a handful of GM parts houses.

I found even the 88 ANCX 16123488 at decent prices at 4 vendors.

Just do a Google search for GM and the part # for the one you need.

Here are the ones we should preserve so that they will be available as long as PROMS can still be burned:

YR MARKED ..GM PN ............ED99 ID

88 ANCX ....16123488..........3534

89 ASSU ....16141300 FED...1094

89 ASSW....16141305 CA.....1104

90 ATYH ....16148013 FED....8064

90 ATYJ .....16148015 CA......8074

91 AWYZ....16162590 FED....8774

91 AWZA....16162594 CA......8784

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According to the above listed chart, if I had an '88 or an '89 Reatta with a Mem-Cal labled *ANBM* - *2541* , this would be wrong for the car?

That is a very early PROM for an 88. (12/1987)

It was replaced by the last version for an 88 ACNX 16123488 to correct MPG calculation sometime after 6/1988

It would not work correctly in an 89, but would probably get the engine to run.

Edited by Mc_Reatta (see edit history)
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Mc-

Ok, that's interesting. None for 88 found at all back when I needed one. Anyway, good to know there are a few out there yet. Despite that, a long term goal for Reatta owners should be to archive the ECM, BCM, CRTC and IPC EPROMS as applicable to each model year.

One thing we don't know (yet) is whether the UVEPROMS of the era will hold their contents reliably on an indefinite basis. In theory they should, but some early PROM devices have been known to exhibit "bit rot" resulting in corruption or loss of stored program and data.

We have just crossed the quarter century mark with the 88's. I would not be surprised to find some of these chips may start to fail somewhere down the road yet just due to age. If so, new chips will need to be programmed for replacement use from known good sources. Easier to get the files together now while parts are readily available.

Maybe I'm worrying for nothing, but right now it is trivial to be prepared for such contingencies.

Ronnie- ID 2544 was the early 88 revision. It was reissued as the ANCX/3544 to correct a problem with the average fuel economy readout on the CRT and hard start issues.

KDirk

Edited by KDirk (see edit history)
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Ronnie- ID 2544 was the early 88 revision. It was reissued as the ANCX/3544 to correct a problem with the average fuel economy readout on the CRT and hard start issues.

KDirk

Are the 2544 and the 3544 equals or is the 3544 an improvement? Thanks
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Are the 2544 and the 3544 equals or is the 3544 an improvement? Thanks

The TSB (88-6E-23) that detailed the need for the newer PROM in the 88s is here, courtesy of Padgett:

http://forums.aaca.org/attachments/f116/193950d1369019204-code-e041-ecm-replacement-88ancxtsb.jpg

Unless that is bugging you, it's probably not worth changing out as it doesn't seem any driveability issues were addressed.

The hard, cold starting problem that also resulted in another TSB being issued was for the 89 and 90 models. That TSB (90-6F-8) is here, again courtesy of Padgett:

http://forums.aaca.org/attachments/f116/193908d1305471449-code-e041-ecm-replacement-promtsb1.jpg

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The TSB (88-6E-23) that detailed the need for the newer PROM in the 88s is here, courtesy of Padgett:

http://forums.aaca.org/attachments/f116/193950d1369019204-code-e041-ecm-replacement-88ancxtsb.jpg

Unless that is bugging you, it's probably not worth changing out as it doesn't seem any driveability issues were addressed

The hard, cold starting problem that also resulted in another TSB being issued was for the 89 and 90 models. That TSB (90-6F-8) is here, again courtesy of Padgett:

http://forums.aaca.org/attachments/f116/193908d1305471449-code-e041-ecm-replacement-promtsb1.jpg

Interesting that the chart shows that on the '89 model year the Reatta and the Riv can interchange, but not on the '88 or '90...

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The TSB (88-6E-23) that detailed the need for the newer PROM in the 88s is here, courtesy of Padgett:

http://forums.aaca.org/attachments/f116/193950d1369019204-code-e041-ecm-replacement-88ancxtsb.jpg

Unless that is bugging you, it's probably not worth changing out as it doesn't seem any driveability issues were addressed.

The hard, cold starting problem that also resulted in another TSB being issued was for the 89 and 90 models. That TSB (90-6F-8) is here, again courtesy of Padgett:

http://forums.aaca.org/attachments/f116/193908d1305471449-code-e041-ecm-replacement-promtsb1.jpg

Thanks for the info. The gas mileage being off isn't a problem for me. If I really want to know the mileage I use the old method of filling the tank and checking miles driven.
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McR,

I ran across the MemCal from my '89. The number shown in the "window" is *APTN*-*2208*

According to the BCC lookup Excel spreadsheet I have, it fits the '89 model year though, it doesn't confirm that it fits a Reatta.

If it does, you can add it to your list.

John F.

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John The APTN is the original equipment EProm. If you go back to post #32 you will see that Mc_Reatta addressed it. It has been superseded by ASSU and ASSW.

I can help with a APTN EProm, but I am holding on to the others until kdirk "burns" it...

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McR,

I ran across the MemCal from my '89. The number shown in the "window" is *APTN*-*2208*

According to the BCC lookup Excel spreadsheet I have, it fits the '89 model year though, it doesn't confirm that it fits a Reatta.

If it does, you can add it to your list.

John F.

This PROM was upgraded to solve an extended crank, cold start problem. Apparently they told the injectors to release more fuel during cranking. If you don't run your Reatta during the winter you may never have encountered this problem. If not, I wouldn't worry about it, but if you think it might help, you can do the upgrade to either the FED or CA version. I'd go with the FED version unless IN has tough smog testing you have to pass to keep it on the road.

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[TD=width: 50] Year

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[TD=width: 99] Release Date

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[TD=width: 63] Eprom

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[TD=width: 63] ECM

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[TD=width: 41] Prom ID

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[TD=width: 42] Scan ID

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[TD=width: 76] Platform

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[TD=width: 50] Disp.

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1993

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33639

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16178063

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16168625

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8064

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8111

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[TD=width: 62] LH6

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6.2

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The above data is taken from an Excel BCC chart for a Mem-Cal PROM ID #8064. This chart seems to be in conflict with the list provided in post #44.

Tomorrow (Thursday) I'll pull the ECM out and check to confirm that the BCC ID is either BBCS as per this chart or ATYH per the list above.

John F.

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Your confusing the PROM ID and the SCAN ID. In post 44, I listed the SCAN ID which is what is displayed when diagnostics or a scanner reads remotely the code off the chip when ED99 is called.for.

That is different from the PROM ID which is a 4 digit number that is stamped on the PROM below the 4 letter code as shown in the photo in post #45. Not sure why they bothered with this number as the PROM is usually IDed by the 4 letter code or the GM part #. The SCAN ID lets you verify what PROM is in the module without taking it out and taking the cover off and looking at it.

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McR,

This is why I get up every morning. I learn something new every day. I did as you said, I confused the Scan ID with the PROM ID. When I did the look-up using the scan ID as reported in ED99 of my car, the chart makes sense. This busts my bubble though. I thought I was on to something regarding my "lumpy" idle.

So that some other poor fellow suffering from CRS might not make this same mistake, maybe you could put a note in the post indicating the ED99 # listed is in fact the SCAN ID. I seems so obvious now but...

John F.

Edited by Machiner 55 (see edit history)
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  • 7 years later...

Mc_Reatta  hey run into same problem as Sehrhard2 brought one that would some what Idle but lack of power

they from what I see replaced the ecm with a reman #16198264 and E-Prom ANBM 2541 THIS IS A 1988 year which from what I have read needs a E-Prom ANCX  the other ecm that they had from junk yard # 01228253 with E-Prom ANBF 2517 SO i AM LOOKING FOR THE  ANCX IF YOU HAVE ONE 

 

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