Help with speedo and trans issues

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12-20-13, 01:20 AM

#16

Kahl

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Perfect thanks Yamae, that's a great resource

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12-20-13, 02:39 AM

#17

LScowboyLS

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Quote:

Originally Posted by Yamae

Yes, higher voltage capacitors are mostly OK. I wrote more at here.

Regarding ECUs for JDM Celsiors, I made a list below for you and those who love JDM Celsiors.

As far as I know, ECUs of each block can be mostly compatible but I cannot guarantee it.

Gen.
ID Number, manufactured, Year.Month, Models used,
How changed.

Gen.1
89661-50100 89.11-90.05 for UCF1#..B,C
89661-50092 90.05-92.08 for UCF10..A
89661-50102 90.05-92.08 for UCF1#..B,C
89661-50102 91.07-92.08 for UCF10..A with TRC

Engine management changed. Cold start injectors added. O2 sensors changed to built-in heater type.
89661-50170 92.08-94.02 for UCF1#
89661-50171 94.02-94.10 for UCF1#

Gen.2 Engine management changed. O2 sensors added at the rear end of CATs. Higher compression 5HP Up.
89661-50240 94.10-95.01 for UCF20
89661-50241 95.01-96.08 for UCF20
89661-50380 96.08-97.07 for UCF20

Gen.2.5 Engine management changed totally with VVT.
89661-50450 97.07-98.08 for UCF20 VVTi Engine
89661-50520 98.08-99.01 for UCF20 VVTi Engine
89661-50521 99.01-99.11 for UCF20 VVTi Engine
89661-50522 99.11-00.08 for UCF20 VVTi Engine

could you make up a similar list for USA LS400 models?

Last edited by LScowboyLS; 12-20-13 at 06:20 AM.

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12-20-13, 05:55 AM

#18

Yamae

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Quote:

Originally Posted by LScowboyLS

could you make up a similar list for USA LS400 models?

I still can't collect data for models shipped outside Japan.

Incidentally, below 2 lines have to be shifted to the upper part as I edited my original post #15.
89661-50102 90.05-92.08 for UCF1#..B,C
89661-50102 91.07-92.08 for UCF10..A with TRC

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01-18-14, 07:35 PM

#19

black_LS

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Quote:

Originally Posted by Yamae

Yes, higher voltage capacitors are mostly OK. I wrote more at here.

Regarding ECUs for JDM Celsiors, I made a list below for you and those who love JDM Celsiors.

A bit off topic, but do you have any specific knowledge of the VVTi ECUs? I'm interested in purchasing a Celsior engine/transmission with an uncut harness, but the ECU is missing and I'm not sure which to buy. My hope is they're all compatible. I believe the transmission part number is 35010-50111, if that helps.

Last edited by black_LS; 01-18-14 at 07:38 PM.

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01-18-14, 08:03 PM

#20

LScowboyLS

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Quote:

Originally Posted by black_LS

98-2000 are fairly compatible

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01-19-14, 12:41 AM

#21

PureDrifter

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'00 had some significant changes to the way the brakes worked, would stick to '98-99 if I was in your situation.

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02-03-14, 08:59 PM

#22

Kahl

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Quote:

Originally Posted by Kahl

Hi guys,

A while ago I noticed my speedo was taking a while to "warm-up" and read correctly when I would start driving the car (1992 ucf11). I had a browse around on the forum and it looked like it was potentially one of two things, either my dash was giving out or a sensor on the gbox was. The odo still was working.

Now I've noticed when I drive (cruising, low throttle) at around 50kph (35mph?) at times it feels like it wants to change gear (up I assume) and the car gets all jumpy, almost like a throttle cut. The same thing has been happening at around 100kph (55mph). I'm not sure if it's gbox related or not?? I was pulling out to pass and as I was trying to accelerate over 100kph the engine would not continue to rev and it felt like I was getting a speed cut or similar.

Could this be an issue with a speed sensor?? The odo continues to read correctly.

Any more information that would be helpful??? Is this the kind of thing that a Toyota service shop would be able to diagnose??

Appreciate the help

Cheers,
Karl

Hi,
So I've done two things.... I bought the caps from digikey and had a local electrician fit them. This took a long time and in the meantime I noticed a second hand 50171 type ecu for sale so I bought that. The car runs good on the 50171 but still no speedo. So I waited until my repair was ready. Got that today and the car runs real good....... But no speedo. If I bang the top of the dash while driving the needle bounces up so it's not stuck.

What's my next course of action?? Speedo sensor on the gbox?? Or is there something that frequently goes wrong with the dash?? Any help much appreciated as always

Cheers
Karl

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02-03-14, 09:30 PM

#23

LScowboyLS

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the speedo problem can be ECU caps, dash cluster caps, or an actual mechanical sticking of the speedometer needle itself (the original lubricant gets gummy after 15 years or so.

there is not an easy way to quickly determine which is causing the issue, other than just fixing all of these, that I am aware of.

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02-03-14, 10:13 PM

#24

Kahl

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Cool I'll pull the dash and see what the caps look like, I assume they'll just be on the back of the gauge cluster?

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02-03-14, 10:47 PM

#25

LScowboyLS

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yes, but these caps are even less likely to show any physical evidence of degradation, so the visual inspection really doesn't do much

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02-04-14, 08:59 PM

#26

Kahl

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Is there a way to test them??

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02-05-14, 12:42 AM

#27

LScowboyLS

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not a way that is substantially easier than just replacing them, that I am aware of

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02-05-14, 12:01 PM

#28

Kahl

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Primo, thanks.

Really appreciate your help so far

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04-22-14, 10:45 PM

#29

Yamae

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Parts number for ECU

Quote:

Originally Posted by Yamae

Yes, higher voltage capacitors are mostly OK. I wrote more at here.

Regarding ECUs for JDM Celsiors, I made a list below for you and those who love JDM Celsiors.

FYI.
I'm still trying to find the list for non-JDM but it's not easy to find them all.
Today, I just add a part of the list for LS400 for Gen. 1 August 1992 - October 1994.

Lexus LS400 ECU for US market
89661-50140 92.08-93.01 for UCF10
89661-50141 93.01-93.08 for UCF10
89661-50142 93.08-94.10 for UCF10
89661-50150 92.08-93.01 for UCF10 Only for California
89661-50151 93.01-94.01 for UCF10 Only for California

Lexus LS400 ECU for Non US market
89661-50160 92.08-94.10 for UCF10 Europe, Singapore
89661-50180 92.08-94.10 for UCF10 General area, Hong Kong
89661-50190 92.08-94.10 for UCF10 Europe (LHD)
89661-50210 92.08-94.10 for UCF10 Europe (RHD)

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07-25-16, 12:05 PM

#30

avhart

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Hi, simple question

Could anyone here tell me if I can replace my 89661-50170 with the 89661-50171? If I read the post right it should work but since I would be actually spending money to acquire the other part (50171) I really would like some additional comfort if at all possible

Thanks in advance

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