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DFI and ECMDiscuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance.
According to the guy who repair my car, the EPROM is dead. I need a new one. He told me to find one. First of all, i barely know what is a EPROM. I do not know anything about electronics. And GM canada don't have my part anymore.
Am i screwed?
According to the guy who repair my car, i need an Eprom AKFR2188
for my CPU number : 1227165. Yey, those numbers seems to be incorrect, cause AKFR2188 is listed for 1988 Trans AM. I looked on this http://www.3rdgenformula.com/89/promcodes.htm and i saw my CPU 1227165. According to this website i need part #... no wait i'm not even writing this, i don't understand nothing of all this anyway.
Find a new mechanic. When they can't fix a car that's what they blame. Eproms don't go bad unless humans have messed with them like installing them backwards or welding near ECM ground wires which usually takes out the ECM. I have never seen an EPROM go bad, some say they have, I even have one from a burned car, melted ECM and it worked fine?
According to the guy who repair my car, the EPROM is dead. I need a new one. He told me to find one. First of all, i barely know what is a EPROM. I do not know anything about electronics. And GM canada don't have my part anymore.
Am i screwed?
According to the guy who repair my car, i need an Eprom AKFR2188
for my CPU number : 1227165. Yey, those numbers seems to be incorrect, cause AKFR2188 is listed for 1988 Trans AM. I looked on this http://www.3rdgenformula.com/89/promcodes.htm and i saw my CPU 1227165. According to this website i need part #... no wait i'm not even writing this, i don't understand nothing of all this anyway.
My PCU (OR ECM I think, i dont know how you call it really) the box in wich the eprom is in, is listed as 1227165
According to GM, its 48$ for an eprom. Yet it's discontinued. I don't want fancy parts, just the original stuff. What i do?
To get an idea of what is involved with the PROM & MEMCAL, see the PROM & MEMCAL sticky above. That ECM uses a MEMCAL of which the PROM is part of.
You are correct about the year of that PROM, it may be that someone in the past swapped ECMs, or, it is a very early car for '89. IOW, GM was still using the '88 MEMCAL when that car was built.
Note that the '88 MEMCAL doesn't have VATs either.
Now, to check if the PROM is OK do this:
While observing the SES/CEL light do a key-on, engine-off the light should turn on briefly, blink off, then turn on solid. Can repeat the test after a a least 10 seconds of key-off.
If the SES/CEL is flashing then the PROM is bad.
If the SES/CEL doesn't turn on at all, the bulb may be burned out, the under hood fuse may be popped, or the ECM may be bad.
If the SES/CEL just turns on solid with no blink, then either the PROM or the ECM is bad.
you would see a code 51 or 41 but still should be able to run in lhm. I have only seen on eprom fair in the last decade and it was a bit flip, these can be repaired if the eprom in the memcal went bad.
Okay. My english is not that good, but i will try to explain further the situation.
My Trans Am started to have problem a few while ago. Engine shutting down every corner and check Engine light up, then off, etc. Went to the garage. We try to get RPO codes but it was a failure because the check engine was always blinking, flashing like, and getting the RPO code was not possible. Then, my repairman just gave a gentle hit on the gloves compartiment (well under of it), and the tcheck engine stopped to blink.
We try 4 Different ECM. 3 used, 1 refurbished. All had the same problem.
Then he did try on my 1989 Trans Am old ECM, a used memcal from one of his friends 1988 Camaro.
I was not there, but he told me all my problems were solved instantly.
Okay. My english is not that good, but i will try to explain further the situation.
My Trans Am started to have problem a few while ago. Engine shutting down every corner and check Engine light up, then off, etc. Went to the garage. We try to get RPO codes but it was a failure because the check engine was always blinking, flashing like, and getting the RPO code was not possible. Then, my repairman just gave a gentle hit on the gloves compartiment (well under of it), and the tcheck engine stopped to blink.
We try 4 Different ECM. 3 used, 1 refurbished. All had the same problem.
Then he did try on my 1989 Trans Am old ECM, a used memcal from one of his friends 1988 Camaro.
I was not there, but he told me all my problems were solved instantly.
rpo codes are not stored in the ecm , you can also order a moates.net g1 and use a $6e .bin on the piggyback if you are not going to attempt to repair the memcal. any 86-88 305 tpi will work in your car but the cold start time will be longer.
Okay. My english is not that good, but i will try to explain further the situation.
My Trans Am started to have problem a few while ago. Engine shutting down every corner and check Engine light up, then off, etc. Went to the garage. We try to get RPO codes but it was a failure because the check engine was always blinking, flashing like, and getting the RPO code was not possible. Then, my repairman just gave a gentle hit on the gloves compartiment (well under of it), and the tcheck engine stopped to blink.
We try 4 Different ECM. 3 used, 1 refurbished. All had the same problem.
Then he did try on my 1989 Trans Am old ECM, a used memcal from one of his friends 1988 Camaro.
I was not there, but he told me all my problems were solved instantly.
> because the check engine was always blinking, flashing like
This a sign that the PROM is bad. The ECM was in limp mode which is why you couldn't pull codes.
Note that the codes are referred to as DTC's, Diagnostic Trouble Codes. RPO codes are Regular Production Order, and are found on the underside of the console lid or the glove-box lid. They list what equipment & options the car has.
See if you can find another MEMCAL in the classifieds here, and/or PM utilityguy2.
> because the check engine was always blinking, flashing like
This a sign that the PROM is bad. The ECM was in limp mode which is why you couldn't pull codes.
Note that the codes are referred to as DTC's, Diagnostic Trouble Codes. RPO codes are Regular Production Order, and are found on the underside of the console lid or the glove-box lid. They list what equipment & options the car has.
See if you can find another MEMCAL in the classifieds here, and/or PM utilityguy2.
RBob.
Wow RBob. You really seems to know what your talking about!
Okay, i'm back from the garage. My repairman took some metalwires and got them between the PROM and the MEMCAL itself. Then, my car started like a charm!
Now, he wants to just (braze, weld; not sure about the right word) those wires between prom and metcal) as some temporary solution.
BTW, now i'm 100% sure about what i need.
EPROM 3506APYR. For my ECM # 1227165.
I looked on a website called : http://www.gmpartsdirect.com/, rockauto, etc; but i'm unable to understand how to find that 3506APYR part. Must i use this number? or is there another number that i must use?
I looked on a website called : http://www.gmpartsdirect.com/, rockauto, etc; but i'm unable to understand how to find that 3506APYR part. Must i use this number? or is there another number that i must use?
BCC= AKFR2188 Scan id= 2341 Part number= 16082187
BCC= APYR3506 Scan id= 3501 Part number= 16133473
Make sure that if you use a '89 MEMCAL, that the ignition key has a resistor or sometimes called a chip in it. That is for the VATs system. No VATS on the car, no start with an '89 MEMCAL (unless modified).
Find a new mechanic. When they can't fix a car that's what they blame. Eproms don't go bad unless humans have messed with them like installing them backwards or welding near ECM ground wires which usually takes out the ECM. I have never seen an EPROM go bad, some say they have, I even have one from a burned car, melted ECM and it worked fine?
Mine went bad. Had a fellow member burn it 3 years ago. Went to turn on the IROC and crank, crank,crank, and all i saw was a grayish cloud coming out the exhaust. SO I sent it bad to Pennsylvania to get it reprogrammed. Burner guy said it was fine. So he flashed it again and now it has a a ses light and the fan is now on as if I have the ALDL grounded.
HEY TUNEDPERFORMANCE!!! Didnt realize you where in here. I got some good feed back for you. All of the 3rd Gen owners from our local car club "Imperial Valley Muscle Car Club" are extremely pleased with the reprogrammed MemCals that you sold them. And I mean all of them. Let me introduce you to them in this video. (Im the dude with the black tank top, blue Dodgers lanyard hanging, and the tan khakis). From left to right (in the video of course) White 88 IROC=Freddy, Mulestang=not important, 94 blue Z28=not important, black 86 IROC with jacked up red hood=Chevy86 IROC-Z (me), white 90 firebird=Joel, green 91 TransAM=Walter, blue 89 Formula=Moises, red 88 IROC=Jayro. http://www.youtube.com/watch?v=QIC4U...&feature=g-upl
All 6, 3rd gen owners (including me) are so thankful for hooking us up with you reprogrammed MemCals. I got a few more buddies who are interested. Is it ok to give them your email address?
I know this is a old thread and this is a Longshot but I have a 1992 camaro rs 5 speed that I swapped a 5.7 tbi in from a 1990 gmc v1500. According to my research they made a 1990 v3500 5.7tbi in a 5 speed manual. I orderd that eprom. Will it be compatible with my camaro ecu or do I have to buy and wire in a v3500 ecu?
Not the correct mask for the ecm. What’s the broadcast code letters on the chip ?
if originally from
a 1227747 ecm truck that’s a direct replacement ecm just doesn’t use iat.
Last edited by Tuned Performance; May 30, 2022 at 10:39 PM.
My camaro has a aftermarket chip in it so idk the numbers, and I orderd a jet performance chip that is for the v3500. Here is a pic of my existing chip if it helps. Just need to know if it will work.
So once i get the chip in the mail i should check the part number on my ecu to verify it is the same as the one you provided before plugging In the eprom. And if it isn't i need to order the correct one? Is the part number on the ecu itself? And what is a calpack?
The calpak is not used in your 1228746 ecm it sets fire rate of injectors v6 or v8.
so the sticker on my ecu is shot. With no way to verify the part number im stuck and i dont want to throw a new ecu at it un nessacarly. If I just plug in the chip I get will it blow something up or does it just have a chance at working or not working.
Need help with the electronics on a 96 Firebird cluster.
I’m new here and need some help and guidance.
Speedo when traveling at say 60 MPH registers over 100MPH.
Odometer is dead on when checking it against GPS and Mile markers.
VSS has been confirmed as good and since the signal from the PCM is shared with the speedo and odometer I suspect there is a resistor or capacitor failure in the cluster circuit.
I am a mechanic but by no means am I an electronic GURU like RBob etc.
Could someone please lead me in the right direction in order to make the cluster repair myself?
I do know how to solder and read a digital meter as needed.
I have not been able to find a cluster schematic anywhere.
I’m attempting to do this car on the cheap for my granddaughter, so buying a $100 cluster or sending it off for an expensive repair is not an option.
Thanks for any help that can be provided.
you would see a code 51 or 41 but still should be able to run in lhm. I have only seen on eprom fair in the last decade and it was a bit flip, these can be repaired if the eprom in the memcal went bad. 
, you can also order a moates.net g1 and use a $6e .bin on the piggyback if you are not going to attempt to repair the memcal. any 86-88 305 tpi will work in your car but the cold start time will be longer. 
