Speed sensor not working?
Thread Starter
Pole Position
Joined: Aug 2013
Posts: 291
Likes: 2
From: Miami Dade
Speed sensor not working?
Members,
I would be grateful for an explanation as to why my 1996 Celsior( UCF21) speed -o-meter and odo-meter are not working on my instrument cluster. BUT my tach-o-meter, temperature gauge, fuel gauge and all other warning lights are working perfectly.
My guess, is that my speed sensor is not working. Can I have a location and a number for this part ? Thanks
I would be grateful for an explanation as to why my 1996 Celsior( UCF21) speed -o-meter and odo-meter are not working on my instrument cluster. BUT my tach-o-meter, temperature gauge, fuel gauge and all other warning lights are working perfectly.
My guess, is that my speed sensor is not working. Can I have a location and a number for this part ? Thanks
Last edited by MattLS400; Mar 6, 2014 at 09:03 AM. Reason: to state year/model
I think if you sensor was faulty it would definitely throw a code. Search the forum for the Speedo/instrument cluster fix since that is a known issue Matt.
Last edited by sha4000; Mar 12, 2014 at 02:52 PM. Reason: Spelling
Lead Lap
Joined: Jan 2007
Posts: 683
Likes: 3
From: UK
Lead Lap
Joined: Jan 2007
Posts: 683
Likes: 3
From: UK
There are 2 speed sensors mounted on the driver's side transmission near the top, IIRC one is for the speedometer the other provides information to the transmission ECU.
According to the exploded diagram they are both the same part numbers (89411-50010) priced at around $120.00 each.
I would check the wiring to them and the plug and socket connections first.
According to the exploded diagram they are both the same part numbers (89411-50010) priced at around $120.00 each.
I would check the wiring to them and the plug and socket connections first.
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Lexus Champion
Joined: Dec 2011
Posts: 4,078
Likes: 87
From: Birmingham, AL
speed sensor is not a part that tends to go bad on LS400, although it sure gets suspected a lot!
the speedometer not working could be cluster capacitors, ECU capacitors (including being rebuilt with incorrect ones) or a mechanical sticking problem (lubricant becomes old and sticky)
it can be difficult to ascertain which of these is the culprit, without just plain old trial & error
the speedometer not working could be cluster capacitors, ECU capacitors (including being rebuilt with incorrect ones) or a mechanical sticking problem (lubricant becomes old and sticky)
it can be difficult to ascertain which of these is the culprit, without just plain old trial & error
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Members,
I would be grateful for an explanation as to why my 1996 Celsior( UCF21) speed -o-meter and odo-meter are not working on my instrument cluster. BUT my tach-o-meter, temperature gauge, fuel gauge and all other warning lights are working perfectly.
My guess, is that my speed sensor is not working. Can I have a location and a number for this part ? Thanks
I would be grateful for an explanation as to why my 1996 Celsior( UCF21) speed -o-meter and odo-meter are not working on my instrument cluster. BUT my tach-o-meter, temperature gauge, fuel gauge and all other warning lights are working perfectly.
My guess, is that my speed sensor is not working. Can I have a location and a number for this part ? Thanks
The signal SPDM stands for SPeeD Meter and it is originally from the speed sensor but it is not directory sent to the speed meter unit. It is processed by the ECU and the pre-processing interface circuit before sent to the meter unit.
An oscilloscope is the best to observe the SPDM signal but you can check it using an audio amplifier and a speaker catching it as a sound.
Lead Lap
Joined: May 2007
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From: KY
Lexus Champion
Joined: Dec 2011
Posts: 4,078
Likes: 87
From: Birmingham, AL
I am still of the opinion that Matt's ECU is not correctly repaired, I would like him to post high resolution photos of the bottom ECU circuit board, so that we can verify that the correct type of capacitors were used and they were installed correctly.
Thread Starter
Pole Position
Joined: Aug 2013
Posts: 291
Likes: 2
From: Miami Dade
There are 2 speed sensors mounted on the driver's side transmission near the top, IIRC one is for the speedometer the other provides information to the transmission ECU.
According to the exploded diagram they are both the same part numbers (89411-50010) priced at around $120.00 each.
I would check the wiring to them and the plug and socket connections first.
According to the exploded diagram they are both the same part numbers (89411-50010) priced at around $120.00 each.
I would check the wiring to them and the plug and socket connections first.
