KahnBB6

iTrader: (5)

I want to put this up in case it may help people source or identify ECU's for their cars.

This started as a few notes for me and accelerated in the last day in order to learn which part numbers correspond to what with SC300 M/T engine computers-- especially for the 5-speed California cars.

I've also included Supra Non-Turbo M/T ECU's as well.

t2d2 has provided a starting list of SC400 ECU P/N's by year, so I've amended the thread to include those as well.

I hope to update the gaps in this with additional ECU part number info that we can verify. Hopefully this will help folks down the road as it becomes harder to go into the Toyota system to look up what are becoming vintage part numbers.

------------------------
Some years I simply could not verify or narrow down enough through Toyota's part system which actually doesn't reference every possible ECU for every year. Short of calling by phone this is as close as I've got it so far.

We all know the major M/T model differences are 1992-1995 OBD1 and 1996-1997 OBD2 but when I saw that there were so many different M/T ECU numbers I thought making this list was the best way to settle the truth.
------------------------

SC300 M/T ECU’s 1992-1997:
#89661-24300 — 92-93 SC300 M/T Federal
#89661-24301 — 1/92 through 8/93 Lexus SC300 2JZ-GE M/T Federal (Toyota Reman of 89661-24300?)
#89661-24320 — 1992 SC300 M/T California
#?????-??????? — 1993 SC300 M/T Federal
#89661-24321 — 1993-1994 SC300 M/T California
#89661-24322(84) — 1992-1994 SC300 M/T California (Toyota Reman of 89661-24320 & 89661-24321)
#89661-24302 — 1994 SC300 M/T Federal
#89661-24360 — 1995 SC300 M/T Federal (not sure if these have heated O2 sensors or not)
#89661-24380 — 1995 SC300 M/T California (first year for heated O2 sensors on Cali models)
#?????-??????? — 1996 SC300 M/T Federal
#89661-24470 — 1996 SC300 M/T California
#89661-24520 — 1997 SC300 M/T Federal
#89661-24521 — 1997 SC300 M/T California


Supra Non-Turbo M/T:
#89661-14590 — 1993-1995 Supra NA M/T Federal
#89661-14570 — 1993-1995 Supra NA M/T California
#89661-14700 — 1996 Supra NA M/T (Cali and Federal -- Toyota's EPC said it's both but this doesn't seem right)
#89661-14741 — 1997 Supra NA M/T (Cali and Federal -- Toyota's EPC said it's both but this doesn't seem right)

Supra Non-Turbo Automatic:
#89661-14560 — 1993 (also 93-95?) Supra NA California

SC300 Automatics:
#89661-24330 — 1992 SC300 A/T (Emissions Type???)
#89661-24331 — 1992 SC300 A/T California
#89661-24332 — SC300 A/T California (1992-1993)
#89661-24333 — 1993-94 SC300 A/T California
#89661-24313 — 1992-94 SC300 A/T Federal
#89661-24313 & 89661-24350 — 1995 SC300 A/T Federal (two ECU part numbers for Federal Emissions in this model)
#89661-24370 — 1995 SC300 A/T California
#89661-24460 — 1996 SC300 A/T Federal
#89661-24461 — 1996 SC300 A/T California (& Federal??)
#89661-24510 — 1997 SC300 A/T (unidentified as either Cali or Federal)
#89661-24511 — 1997 SC300 A/T California (& Federal??)
#89661-24551 — 1998 SC300 A/T California & Federal
#89661-24570 — 99-2000 SC300 A/T California & Federal


SC400:
#89661-24230 — 1992-1994 SC400 (Emissions type... Federal???)
#89661-24231(84) — 1992-1994 Federal, built Jan '94 or earlier (Toyota Reman of 89661-24230??)
#89661-24240(84) — 1992-1994 California, built Jan '94 or earlier
#89661-24410 — 1994-1995 Federal, built Feb '94 or newer
#89661-24411 — 1995 SC400 (Federal & Cali?)
#89661-24453 — 1996-1997 SC400 (Federal & California ALL?)
#89661-24453(84) — 1996-1997 SC400 (Federal & California ALL?) (Toyota Reman of 89661-24453)
#89661-24480(84) — 1997 SC400 (Federal & California ALL?)
#89661-24534 —1998 SC400 (Federal)
#89661-24610(84) — 1998 SC400 (Federal & California ALL?)
#89661-24562(84) — 1999-2000 SC400 (Federal & California ALL?)


Notes:
--------
I can confirm that despite 1992-1995 being generally considered as "OBD1" and interchangeable, at least for California SC300's, a 1995 Cali SC300 ECU will operate any 1992-1994 SC... but there will be a permanent CEL, probably due to the aforementioned switch to heated O2 sensors or the air injection that started in 1995 Cali models. This applies to factory Cali M/T SC300's and by extension (I assume) A/T Cali SC300's as well.

Also, running a 1995 SC300 M/T Cali-Spec ECU in a 1992-1994 SC300 Cali-Spec vehicle will probably result in running rich since the '95 ECU will not be getting the correct signals it will want from your non-heated O2 sensors. This might... possibly... have a negative effect on the health of your '92-'94 style O2 sensors.


For turbocharged applications, here is a list of GE and GTE (USDM and JDM) ECU P/N's identified and collected on Supraforums (check the link just in case the info here is not fully up to date):

http://www.supraforums.com/forum/sho...cation-Numbers

Aristo ECU Part Number:
- 89661-35060 (91-93)
- 89661-30870 (93-97)

Supra ECU Part Numbers (Auto, J-Spec, NA):
- 89661-14600 (93-97)
- 89661-14810 (97-99)

Supra ECU Part Numbers (Auto, J-Spec, TT):
- 89661-14490 (9305-9310)
- 89661-14491 (9310-9605)

Supra ECU Part Numbers (5Spd, J-Spec, NA):
- 89661-14610 (only number listed)

Supra ECU Part Numbers (6Spd, J-Spec, TT):
- 89661-14500 (9305-9310)
- 89661-14501 (9310-9605)
- 89661-14770 (9605-9709)
- 89661-14830 (9709-)

Supra ECU Part Numbers (6-speed, US Spec, TT):
- 89661-14520 (93.5-95)

Aristo ECU (JZS16#)
- 89661-3A470 (9708-0007)
- 89666-30180 (0007-)

The ECU part number depends on the age of the car.
2JZ-GTE engine
jzs=Aristo
89661-30510 = JZS147..Q Oct 91 - Aug 93
89661-30750 = JZS147..Q Aug 93 - Aug 95
89661-30880 = JZS147..Q Jul 94 - Feb 95
89661-3A180 = JZS147..Q Aug 95 on

2JZ-GTE engine
89661-30560 = JZS147..V Oct 91 - Aug 93
89661-30870 = JZS147..V Aug 93 on

t2d2

iTrader: (8)

A few A/T SC400 part #'s to fill out the list:

#89661-24410 = '94-95 Federal, built Feb '94 or newer
#89661-24231 = '92-94 Federal, built Jan '94 or earlier
#89661-24240 = '92-94 Cali, built Jan '94 or earlier

I'm not sure about the '94-95 Cali; I assume it exists and I simply didn't come across it when researching compatible stuff.

KahnBB6

iTrader: (5)

^^ Thanks t2d2! I've added those to the list and I've updated the thread title. I'll see what I can turn up myself with SC400 ECU data.

SC400slide

iTrader: (11)

My 92 SC400 shows an ECU that reads "89661-24230". Still attempting to confirm compatibility. Wonder if that one makes the difference...

t2d2

iTrader: (8)

In my notes, I have: "reman #89661-24231-84 replaces original #89661-24231 and #89661-24230." I would guess 24230 and 24231 are compatible, but I couldn't find anything confirming or denying it. If someone could unravel the numbering sequence, that might help make sense of it.

KahnBB6

iTrader: (5)

t2d2, I've seen this "84" designation for a lot of revision or remanufactured ECU part numbers. I think it's just Toyota's way of identifying them as such because you have to delete the "84" at the end when querying any Toyota/Lexus Trademotion database with these P/N's. This tacked on two digits has shown up a LOT in my searches.

I don't know for sure but my guess is that you can trust what the database told you: 89661-24231(84) appears to be a reman by Toyota that replaces a worn out 24231 or 24230. This suggests that they are all Federal ECU's intended for the same '92-'94 years (because 24231's apparently cover 92-94 model years then the same probably applies to the 24230 version, since Toyota associates them)

SC400slide, if the 89661-24230 came right out of your 1992 SC400 then I'll add that to the list for 1992's.

So far I've just tried to see a database or owner echo the same part number for an application more than once, or in some cases a date range.

The SC300 M/T ECU list is a bit more confusing mostly because there are more configurations available and I wanted to post the information as-is rather than interpret very much.

BlackIRON

hey guys i couldnt find the computer for my 96 here which is part# 89661-24460

KahnBB6

iTrader: (5)

BlackIRON, the list is an ongoing work in progress so I'll be happy to add any verified contributions.

Is your 1996 an SC300 (A/T or M/T?) or SC400? And Federal or California emissions type?

Thanks!

BlackIRON

a/t sc300 federal , thanks

t2d2

iTrader: (8)

Another one for the list:

#89661-24534 = '98 SC400 Federal

Not sure how it differs from the xxx-24610 you've got listed. Edit: Just remembered, my ECU was replaced back in '03, according to the dealer service history, because the owner lost their keys. So, xxx-24534 could be a superseded part number.

kingblack

Is the manual 96 sc 300 ecu a direct fit for a 97 sc 300 auto to manual swap?

kingblack

If so will my Trac light flash cause from what i hear the 92 to 97 manuals never had traction control.

KahnBB6

iTrader: (5)

For a Federal or California 1997 SC300 Automatic?

Unfortunately the 1996 Federal SC300 M/T entry is one of the two manual ECU part numbers we still have not been able to confirm with a hard example from Toyota or from a forum member giving us the ECU P/N from their vehicle.

Right now I cannot say whether or not the 1996 M/T Federal and 1997 M/T Federal ECU's are different or the same part number. 1996 M/T Cali-Spec and 1997 M/T Cali-Spec are definitely different enough to have different part numbers... but you should only use a Cali-Spec M/T ECU if your car's VIN identifies it as a Cali-Spec Emission model.


You are correct that 1992-1997 SC300's that were factory 5-speeds never had a traction control option. The same is also true of 1993.5-1997 Supra MKIV Base/NA 5-speed M/T's (no available traction control).

I am not aware of the TRAC light being permanently on if you use the correct M/T ECU since those signals should originate from the ECU in the first place. Despite there being a separate TRAC ECU I believe it remains dormant when doing a manual swap that includes an M/T ECU. I have not performed an auto-to-manual swap on a TRAC equipped SC300 myself so if anyone reading this with knowledge to the contrary would care to comment the info would be appreciated.

kingblack

Im not sure if my 97 sc 300 is Federal or Cali i haven't taken out the ECU yet. Right now it parked at my friend's house while my state inspection guy gets his stickers. I was just checking here first to check compatibility of the 96 M/T ECU i saw on ebay for sale. I was gonna purchase the ECU and hopefully run it on a 1JZGTE when im ready. Right now im paying over double for state inspection cause of the CEL for my auto transmission ECU. How can you tell if it's Fed or Cali? Can i check through the VIN or do i have to pull the ECU? Thanks for responding by the way....

KahnBB6

iTrader: (5)

Sure thing.

First of all you cannot run any 2JZ-GE ECU on a 1JZ-GTE or 2JZ-GTE. Different ignition systems (Distributor vs Coil Packs), fuel maps, and ability to understand boost pressure (or not as with NA ECUs). If you are going to install a 1JZGTE then get the JDM ECU that goes to that series of 1JZGTE, preferably coming with the the imported engine and its harness unless you know exactly what part number for the 1JZGTE manual ECU you would need.

A USDM SC300 M/T ECU of any year from 92-97 is only applicable to an NA 2JZ-GE. The same applies when using a 2002-2005 IS300 M/T ECU on a 2JZ-GE VVT-i engine that has a wiring harness compatible for that application.

You can find out if your car has Federal or Cali-Spec emissions by taking your VIN number and calling up a Lexus dealer parts department. Ask them if they can help you by identifying which market your car was originally sold for (Federal or California). Their computer will identify all the parameters that apply to your vehicle based on that VIN number. You should also be able to verify through that Lexus call what ECU part number your car should have. They will probably tell you the superseded "Toyota Reman" part number for your car's ECU which may be slightly different from the original by a digit at the end. This Toyota Reman ECU part number also always ends in an additional "-84".

You can also look under your hood at the Emission Label next to the serpentine belt routing diagram. Unless the original hood was ever replaced for some reason it will say whether the car came with Federal 49-State or California 50-State emissions.

Check the first post in this thread for examples of the original ECU part number for a specific model, year, transmission and emission type versus the additional Toyota Reman ECU part number for that same model variant.

If you're in a bind right at or beyond or a deadline with a state inspection due to a failing ECU that's rough. I've been there :/ I recommend either pulling out your original ECU and copying the part number down to look for a second identical one on ebay and have it repaired at Tanin to make absolutely sure that's ruled out and then focus on your 1JZGTE project after the official business is off your back.

Also, when you take out your original ECU, be careful of the label on it with identifying information! Don't rub it or do anything to it if you can because those tend to deteriorate with age and become illegible. A solution I use that works very well: have a roll of fully clear non-colored packing tape and some scissors handy. With the ECU removed, *carefully* and neatly apply a couple strips of the packing tape onto the ECU identifying label, fully covering it beyond the edges of the label. There is plenty of room on the metal surface to do this. This will preserve that label from additional wear and tear so that the identifying information on it won't rub off in the future.

Additionally important: if you were planning to run a 2JZ-GE M/T ECU on an SC300 that is not yet converted to a manual transmission, know that M/T ECU's cannot control an automatic transmission if your car still has one. There is no circuit inside an M/T ECU that pays attention to what the automatic transmission needs for control and it will not shift.

Right now if you are against the clock I would focus on getting a known repaired 1997 A/T ECU in your car, making sure it's the correct emission type as dictated by your VIN.