- ECM/MemCal Part Numbers and Cross Reference -

[ECM Part Numbers] - [MemCal Part Numbers] - [Resistor Pack Cross Reference]

Before we start thinking about programming our own PROMs for tuning our rides, we need to know what we have (or want) to work with.  Below is a list of ECM and MemCal part numbers GM used in certain years and power teams.  If you want to know about your Firebird or other year Camaros this topic doesn't cover, check out Thirdgen.org and visit their FAQ's.

We have references to V6 and 4 cylinder Camaros for reference.  You will notice that, in some years, GM used the same ECM for the V6 as well as the V8, but in others, they didn't.  If you are in the market for an ECM, this information may help you get a better deal.

Two key things to remember.  Some ECMs can be used for either V6 or V8 applications, however, you must have a MemCal for your specific engine and emissions options.  Some MemCals are interchangeable between different V8s, as long as they use the same ECM and the resistor packs are of the same part numbers (see below).


This is a MemCal (Memory Calibration Unit) with the cover removed.  (Check out "Installing the Moates memory adapter for 1986-1990 IROC-Zs" in the Articles section for details on where it resides and how to access and remove it.)  To the left, is the PROM chip.  This particular ECM uses a 128 byte (16K) PROM chip.  The center, smaller chip is one of two resistor packs (14-pin).  To the right is the second of two resistor packs (16-pin).  These two smaller chips are laser etched resistor packs that control start-up and limp mode controls.  Limp mode controls are essentially a backup code that the ECM can reference in case something goes wrong with the PROM or other functions of the ECM that prevents the vehicle from obtaining and computing usable data.  If you are obtaining a spare MemCal to work with or find a great deal somewhere for one, you should ensure that it's from a V8 car, from the same ECM and have the same resistor pack part numbers (located on each chip).

Reference: http://clubs.hemmings.com/clubsites/fieroswest/Tech%20Scene/Sensors/MemCal/MemCal.htm basically going over some markings and part number changes over the years based on the Fiero.  Similar applies to ours.  Most of it refers to pre and post 1994, but it also gives you more information in locating your part numbers for your MemCal.

 

Please keep in mind that some data below may not be complete.

ECM Part Numbers

Year(s)

 Cylinders Engine - Ltr (C.I.-Eng Code) ECM Part No.
1992-90 6 3.1 Ltr. (189-T) 1227730
1992-90 8 5.0 Ltr. (305-F) 1227730
1992-90 8 5.7 Ltr. (350-8) 1227730
1989-87 6 2.8 Ltr. (173-S) 1227302
1989-87 8 5.0 Ltr. (305-F) 1227165
1989-87 8 5.7 Ltr. (350-8) 1227165
1987 8 5.0 Ltr. (305-H) 1228079
1986 4 2.5 Ltr. (151-2) 1226864
1986 6 2.8 Ltr. (173-S) 1227302
1986 8 5.0 Ltr. (305-F) 1227165
1986 8 5.0 Ltr. (305-G, H) 1227169
1985 4 2.5 Ltr. (151-2) 1226864
1985 6 2.8 Ltr. (173-S) 1226870
1985 8 5.0 Ltr. (305-F) 1226870
1985 8 5.0 Ltr. (305-G, H) 1226865

MemCal Part Numbers/PROM Codes            

Year

 Engine Options and Emissions Designation

Part
Number

 Prom Code(s)
1985 5.0-F A/Trans(MD8) Fed, Calif, A/C 1227739 2315HLK 2623CSU 3978HLK
9545FTM
1985 5.0-F A/Trans(MD8) Fed, Calif, Exc.A/C 1227740 2352HLM 2488CSC 3800HLL
9656FTP
1986 5.0-F A/C, VD1,VE1 (Export) 16061103 1107BLL
1986 5.0-F A/C, VB4, BT7 (Export) 16061117 1120BLN
1986 5.0-F Fed, Calif, A/C, 215/65/15 tires 1228290 3234ANY 8958AMU 8969ANB
8980ANY 8993AUM
1986 5.0-F Fed, Calif, A/C, 235/60/15&16 tires 1228291 3236AUM 8958AMU 8969ANB
8980ANY 8993AUM
1986 5.0-F Fed, Calif, Exc A/C, 215/65/15 tires 1228292 3240BTZ 8964ANA 8975AND
8987BTZ 8998AWC
1986 5.0-F Fed, Calif, Exc A/C, 235/60/15&16 tires 1228293 3243AWC 8975AND 8987BTZ
8998AWC
1986 5.0-F VD1, VE1 Exc A/C (Export) 16059564 9567BUR
1986 5.0-F VB4, VT7 Exc A/C (Export) 16059576 9580BUT
1986 5.0-F Fed, Calif, A/C, 3.42(GU6) 16059000 9004AWD
1986 5.0-F Fed, Calif, Exc A/C, 3.42(GU6) 16059006 9009AWF
1987 5.0-F A/Trans(MD8) NM8 (Export) 16066043 6046ABBK
1987 5.0-F A/Trans(MD8) Fed, 2.73(GU2) 16068515 8517ABUN
1987 5.0-F A/Trans(MD8) Calif, 2.73(GU2) 16088558 8562ABUT
1987 5.0-F A/Trans(MD8) Fed, 3.23(GU5), 3.27(GW6) Exc Export(NM8) 16071097 1099ACXT
1987 5.0-F A/Trans(MD8) Calif, 3.23(GU5) 16071106 1108ACXW
1987 5.0-F M/Trans(M39) Fed, 3.08(GU4) 215/65/15 tires 16068578 4469AANR 8582ABUY
1987 5.0-F M/Trans(M39) Fed, 3.08(GU4) 16"tires 16071115 1117ACXY
1987 5.0-F M/Trans(M39) Fed, 3.45(GM3) 16071119 1122ACXZ
1987 5.0-F M/Trans(M39) Calif, 3.08(GU4) 215/65/15 tires 16071128 1130ACYB
1987 5.0-F M/Trans(M39) Calif, 3.08(GU4)16"tires 16071133 1135ACYC
1987 5.0-F M/Trans(M39) Calif, 3.45(GM3) 16071137 1139ACYD
1987 5.7-8 A/Trans(M39) Fed, 3.27(GW6) 16068654 8656ABWN
1988 5.0-F A/Trans(M39) Fed, 2.73(GU2) 16082173 2174AKFM
1988 5.0-F A/Trans(M39) Fed, 3.23(GU5) 16082183 2184AKFP
1988 5.0-F A/Trans(M39) Calif, 2.73(GU2) 16082439 2440AKFZ
1988 5.0-F A/Trans(M39) Calif, 3.23(GU5) 16082448 2449AKHB
1988 5.0-F M/Trans(M39) Fed, 3.08(GU4) 16082388 2389AKFT
1988 5.0-F M/Trans(MK6) Fed, 3.45(GM3) 16082422 2423AKFW 6423ANPJ
1988 5.0-F M/Trans(M39) Calif, 3.08(GU4) 16082462 2463AKHF
1988 5.0-F M/Trans(MK6) Calif, 3.45(GM3) 16082470 2472AKHJ
1988 5.7-8 A/Trans(MD8) Fed, 2.77(GH3) 16075399 5400ABYA
1988 5.7-8 A/Trans(MD8) Fed, 3.27(GW6) 16083268 3269AKXX
1989 5.0-F A/Trans(MD8) Fed, 2.77(GH3), 2.73(GU2) 16129297 9298ANYH
1989 5.0-F A/Trans(MD8) Calif, 2.77(GH3), 2.73(GU2) 16129383 9384ANYZ
1989 5.0-F M/Trans(M39) Fed, 3.08(GU4) 16129337 9338ANYR
1989 5.0-F M/Trans(MK6) Fed, 3.45(GM3) 16129349 9350ANYS
1989 5.0-F M/Trans(MK6) Calif, 3.45(GM3) 16129359 9360ANYT
1989 5.0-F M/Trans(M39) Calif, 3.08(GU4) 16129365 9366ANYU
1989 5.7-8 A/Trans(MD8) Fed, 2.77(GH3) 16129303 9303ANYJ
1989 5.7-8 A/Trans(MD8) Fed, 3.27(GW6) 16129307 9308ANYK

Resistor Pack Cross Reference            Reference: Ludis' Home Page

14 Pin 16 Pin Year(s) Engine Options (RPO) ECM Sample Prom Codes
16035010 16035011 1986 2.0-P M/Trans, TBI (LQ5) 1227165 CRY, CRZ
16055375 16055376 1987-88 5.0-F TPI (LB9) 1227165  
16055375 16055376 1987-88 5.7-8 TPI (L98) 1227165 ABYA
16057556 16057557 1987 2.0-1 TBI (LL8) 1227730 FML, AAST, ADDT, ADDU
16060898 16060900 1987-91 2.5-E Truck TBI (LN8) 1227165 ADHF, AMJW, ASWY, AXAA
16060898 16060900 1990 2.5-R TBI (LR8) 1227727 APTW
16060954 16060956 1987-89 2.8-W PFI (LB6) 1227727
1227730		 AAWW, AAXM, ADBT, ADBU, ADCM, ADPK, ADPL, ADRX, ADRZ, ALZN, ALZT, AMAP, ANKK, ANWA, APWD, APWM, ARBX, ARCN, ARYH, ARXU, ASMK, ASMW, ASMX, ASNA, ASNB, ASWD, ATRA, ATZF
16060954 16060956 1989-90 3.1-T PFI (LH0) 1227727 ARCX, ARZW, ATSN, ATSP
16072665 16072667 1989 5.0-F TPI (LB9) 1227165  
16072665 16133420 1989 5.7-8 TPI (L98) 1227165 ARAR, AUJM
16080140 16080142     Austrailian V8    
16087223 16087224   3.8 Austrailian V6 1227808 ATFY
16088733 16088735 1990-91 3.1-T PFI (LH0) 1227730 AUAR, AUMY