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1990-2000 ECU list for North America (Yamae)

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Old Oct 24, 2014 | 06:25 PM
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Default 1990-2000 ECU list for North America (Yamae)
This list of ECU part numbers was complied by Yamae.

This will help to define which ECU's are in the North American spec LS400's. We've seen some different ECU's part #'s among the LS400's so not all are generically one part# for all models.

If your ECU has a different part# please post it in this thread.

This is not for capacitor fixes/requests. Any posts that follow the ECU capacitor fixes are to be posted in this thread:
https://www.clublexus.com/forums/ls4...capacitor.html


As far as I investigate the variation of the ECU for the North American market, there are ECUs as follow.

ECU Part Number USA/CND Some for Taiwan
-----------------------------------------------
90-93 model
Part Number, Production Date, Model(Description)
89661-50010, 05/1989-08/1990
89661-50020, 05/1989-08/1990 W(TRACTION CONTROL)
89661-50030, 05/1989-08/1990 CALIFORNIA SPEC
89661-50031, 08/1990-09/1990
89661-50032, 09/1990-08/1992
89661-50040, 05/1989-08/1990 CALIFORNIA SPEC & W(TRACTION CONTROL)
89661-50041, 08/1990-09/1990 W(TRACTION CONTROL)
89661-50042, 09/1990-08/1992 W(TRACTION CONTROL)
89661-50140, 08/1992-01/1993
89661-50141, 01/1993-08/1993
89661-50142, 08/1993-10/1994
89661-50150, 08/1992-01/1993 CALIFORNIA SPEC
89661-50151, 01/1993-01/1994 CALIFORNIA SPEC
------------------------------------------------
94-97 Model
89661-50220, 10/1994-02/1995
89661-50221, 02/1995-08/1995
89661-50230, 10/1994-02/1995 CALIFORNIA SPEC
89661-50231, 02/1995-08/1995 CALIFORNIA SPEC
89661-50290, 10/1994-02/1995 USA TAIWAN SPEC
89661-50291, 02/1995-08/1995 USA TAIWAN SPEC
89661-50302, 08/1995-09/1995
89661-50303, 09/1995-08/1996
89661-50330, 08/1995-08/1996 USA TAIWAN SPEC
89661-50340, 08/1996-09/1996
89661-50341, 09/1996-07/1997
89661-50370, 08/1996-11/1996 USA TAIWAN SPEC
89661-50371, 11/1996-07/1997 USA TAIWAN SPEC
------------------------------------------------
Model after 98
89661-50430, 07/1997-10/1997
89661-50431, 10/1997-11/1997
89661-50433, 11/1997-02/1998
89661-50434, 02/1998-08/1998
89661-50480, 07/1997-10/1997 USA TAIWAN SPEC
89661-50481, 10/1997-11/1997 USA TAIWAN SPEC
89661-50483, 11/1997-02/1998 USA TAIWAN SPEC
89661-50484, 02/1998-08/1998 USA TAIWAN SPEC
89661-50501, 08/1998-05/1999
89661-50502, 05/1999-08/1999
89661-50511, 08/1998-05/1999 USA TAIWAN SPEC
89661-50512, 05/1999-08/1999 USA TAIWAN SPEC
89661-50530, 08/1999-11/1999
89661-50531, 11/1999-08/2000
89661-50540, 08/1999-08/2000 USA TAIWAN SPEC
-----------------------------------------------
As is posted at the post #8, 89661-50224 is used replacing 89661-50220 (factory installation 10/1994-02/1995) / 89661-50221 (factory installation 02/1995-08/1995) as a countermeasure for the engine halt problem at certain conditions. For California, 89661-50234 is used replacing 89661-50230 / 89661-50231.
Last edited by Yamae; Sep 10, 2025 at 10:55 PM. Reason: To add additional information about the replacement ECUs for a 95
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Old Oct 24, 2014 | 08:46 PM
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can someone please tell me what the difference between 89662-50010 and 89661-50502-84 is? i thought the latter was the ECU for my 1999 LS
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Old Oct 25, 2014 | 08:31 AM
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My 98 came from the factory with:
89661-50432
When they changed it earlier this year they gave me an ECU with the following numbers:
89661-50560-84
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Old Oct 25, 2014 | 10:12 AM
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Interesting. Can you post the build date of your LS?
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Old Oct 25, 2014 | 04:07 PM
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Regarding 89662-50010, see below.

https://www.clublexus.com/forums/att...eplacement.pdf
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Old Oct 26, 2014 | 12:02 PM
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so if 89662-50010 is the engine computer, which by the way has a list price of $7,635.71, is 89661-50502-84 just the same part but remanufactured? and that one has a list price of $1,301.67
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Old Oct 26, 2014 | 01:36 PM
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Originally Posted by RA40
Interesting. Can you post the build date of your LS?
Here's a pic of the old and new ECU. My build date is 12/97.
Attached Thumbnails 1990-2000 ECU list for North America (Yamae)-original-ecu.jpg   1990-2000 ECU list for North America (Yamae)-new-ecu.jpg  
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Old Oct 27, 2014 | 07:17 PM
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Originally Posted by sha4000
Here's a pic of the old and new ECU. My build date is 12/97.
Thank for the information and the detailed photos, sha4000. As Stroock639 and you just posted, there are some more ECUs other than the list at the post #1. The list is only the collection of data obtained from the manufacturing and the parts suppling information. Other than those, there are ECs (Engineering Changes) and TSBs. These are not yet covered.

For examples, according to one of the TSBs, 89661-50224 is used replacing 89661-50220 (factory installation 10/1994-02/1995) / 89661-50221 (factory installation 02/1995-08/1995) as a countermeasure for the engine halt problem at certain conditions. For California, 89661-50234 is used replacing 89661-50230 / 89661-50231.

As sha4000 kindly informed us, it would be nice to update the list by members here. I'm away from North America and I only can do a little. When you guys remove the ECU box and open to replace capacitors, I expect you to see the ID number and post it here.
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Old Oct 28, 2014 | 03:19 PM
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Hello

LS400 96, Manufactured 12/95 ECU: 89661-50303. Canada.

Same as specified in your list.
Attached Thumbnails 1990-2000 ECU list for North America (Yamae)-ls400-ecu-number.jpg  
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Old Dec 12, 2014 | 02:12 AM
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I have worked on a 89661-50304 from 1996 - which is not in your list

although it is a rare number to find
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Old Dec 12, 2014 | 01:04 PM
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Originally Posted by LScowboyLS
I have worked on a 89661-50304 from 1996 - which is not in your list

although it is a rare number to find
glad to see you back good sir!
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Old Dec 12, 2014 | 01:25 PM
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Welcome back Cowboy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old Dec 12, 2014 | 02:19 PM
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You list:
"89661-50032, 09/1990-08/1992"

That is the part number for my 1991 California car with no TRAC. Photos of the circuit boards are posted on the ECU cap repair thread.

In that thread, it is discussed that the TRAC version has one more capacitor than mine does. I don't know if the ECU part number is different too.
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Old Dec 13, 2014 | 12:44 AM
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Originally Posted by Yamae
Thank for the information and the detailed photos, sha4000. As Stroock639 and you just posted, there are some more ECUs other than the list at the post #1. The list is only the collection of data obtained from the manufacturing and the parts suppling information. Other than those, there are ECs (Engineering Changes) and TSBs. These are not yet covered.

For examples, according to one of the TSBs, 89661-50224 is used replacing 89661-50220 (factory installation 10/1994-02/1995) / 89661-50221 (factory installation 02/1995-08/1995) as a countermeasure for the engine halt problem at certain conditions. For California, 89661-50234 is used replacing 89661-50230 / 89661-50231.

As sha4000 kindly informed us, it would be nice to update the list by members here. I'm away from North America and I only can do a little. When you guys remove the ECU box and open to replace capacitors, I expect you to see the ID number and post it here.
Yamae my question for you is can a 1996 LS (-50303) ecu be used in a 1995 LS (-50220) without a problem? Thanks.
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Old Dec 13, 2014 | 03:21 AM
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Originally Posted by LS400FAN
Yamae my question for you is can a 1996 LS (-50303) ecu be used in a 1995 LS (-50220) without a problem? Thanks.
Since I live in Japan and I did not have tried that but for a 95 Celsior, I have tried to use a 96 Celsior's ECU 89661-50380 replacing from 89661-500241 which is for a 95 Celsior and the result was quite OK. After changing, there was no more engine stop after the long high speed run. A guy named Dutchy also tried it and he was happy with the results. He became much happier after changing capacitors.
https://www.clublexus.com/forums/ls4...ml#post7649127
https://www.clublexus.com/forums/ls4...ml#post8118881
https://www.clublexus.com/forums/ls4...ml#post8119447

I think your idea would be OK.
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