Long story short od light flashing it's code 42 replaced both speed sensors and still no speedometer reading and od light still flashing, what next?

 

I even swapped out the gauge cluster with my old one and still nothing still getting code 42 and no speedometer

 

got another ecu and still have not fixed this problem can anyone give any suggestions? Thinking about tracing wires and possibly getting into the transmission to see something isn't spinning the plastic gear like it should

 

Any updates? I'm having the same issues on my 90

 

Negative still no speedometer or odometer

 

I bought a used $20 ECU working properly (said the ad) and a ebay cluster also (working 100% said the other ad). I hope it fixes the issue on my car.

You may have a damaged wire from the sensor to the cluster or cluster to the ECU. I attached a wiring diagram for the combination meter just in case.

 

This is not about Celsior/LS400 but a JDM Toyota Crown. I remember that early Celsors used similar ways of designing speedometer circuits. Just look at the drawing and photos of the page below since everything is written in Japanese. You may find a way to fix your problem.
http://www.jaspa-oita.or.jp/jissen/2013/09/page1_1.html

Simply summarize the contents,"The driven gear was worn and curved as was in the photo and only changing it fixed the problem. The gear alone was available."

As I asked local a shop owner, the part number is 33482-59025 and it was widely used for Toyota FR cars in 80s and 90s. Early JDM Celsiors use 33482-59025 and probably following link may be useful if this part is worn out on your car.
https://www.ebay.com/sch/i.html?LH_C...udlo=&_fosrp=1

 

Yea the speed sensor #1 is driven by a small plastic gear which sits inside the transmission and that is driven by an actual transmission gear. I checked the inner gear and the plastic gear but on my case both where in perfect condition.

OP I suggest you check that gear just in case.

 

Well just replace that gear on mine and still nothing I don't freaking get what else it could be just all of a sudden came back from vacation and speedo and odometer do not work

 

I have the same issue you do (odometer, speedo, trip not moving). Code 42 (and now solenoid 4 open or short circuit).

I replaced ECU, recapped my original ECU, replaced Instrument cluster, replaced speed sensor. Still the same thing, I will take it to an electro-mechanic tomorrow early in the morning to have it checked, if that fails to another shop then. I'm now betting the issue is somewhere in the wires running from the speed sensor to ecu or to instrument cluster (I will also have the guy check the trunk hinge wires just in case). My car had the GAUGE and CIG fuse with ones of higher amperage (15 and 20 respectively) which I replaced with the ones that originally go (10 and 15) and still nothing.

Let's hope the guy can find something tomorrow and if he does I will message you ASAP, I know how stressful this can be.

 

Yes please do I'm about to rip the wiring out and redo it that's about the last straw on what's left to do

 

Same here, I don't know what else could be the issue besides wiring at this point.

does your car drive badly? Mine shift erratically and I feel it doesn't have enough power, maybe slipping because of bad speed sensor signal? i don't know.

 

Time to check the waveform. It would be easier and quicker to use an oscilloscope to troubleshoot this kind of problem. A good one costs thousands dollars but something like below link is inexpensive and can be used for your kind of problems. See her explains.

 

In my case if instrument panel, sensor and ECU got replaced it must be wiring so I don't think the oscilloscope would help much there because if it is wiring volts would be none or way low because of a ground out or something (correct me if Im wrong).

 

I must correct you some. You need to check the amplitude of the signal. How can you do that?