Speed sensor not working?
#1
Pole Position
Thread Starter
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; 03-06-14 at 09:03 AM. Reason: to state year/model
#5
#6
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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#8
Lexus Champion
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
#11
Moderator
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.
#12
#13
Lexus Champion
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.
#14
Pole Position
Thread Starter
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.