LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

1994 LS400 ECU Fed emissions vs California

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Old 12-22-22, 08:42 AM
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omidathari
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Default 1994 LS400 ECU Fed emissions vs California

Hi friends,
Does anyone know if the ECU for the Fed emissions cars are different from the California emission cars.
Can any one confirm what these ECU are in the following pictures:
Thanks very much in advance.


ECU -1

ECU - 2
Old 12-22-22, 08:55 AM
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LeX2K
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California spec has its own ECU due to a different EGR system among other things.
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Old 12-22-22, 12:49 PM
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deanshark
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Both of these are California spec. One is for 93 and other for 94.
89661-50150, 08/1992-01/1993 CALIFORNIA SPEC
89661-50151, 01/1993-01/1994 CALIFORNIA SPEC
I don't recall what "small" changes there was between the 2 years. But, just to let ya know, the Ca. spec will work on the fed. spec cars. But, as mentioned, the emissions is different for the Ca. cars. I know there's an air pump on the Ca cars that's not there on the fed. spec cars.
Check out this thread if ya didn't see it; https://www.clublexus.com/forums/ls-1st-and-2nd-gen-1990-2000/656360-all-my-crazy-lexus-issues-solved-ecu-leaking-capacitor.html

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