Why did the speedometer stop?

Tiny
SHADOWBOXER50
  • MEMBER
  • 1994 LEXUS SC 400
  • 136,875 MILES
1994 Lexus SC400.A recent road trip sent it into a tailspin. Started out with quick oil change shop, got 320 miles away, battery goes dead, replaced that and then on the way home, had to excelerate quickly and looked down and saw speed on the speedometer, a mile later it is on zero, odomoter quit, and cruise stopped. O/d light keeps flashing. What could have happened? Blown fuse, do I reset computer? Wire loose from quick oil shop? Bad Speed Sensor? Bad speedometer, motor on back of it? Broken cable? Any one of those or am I listing everything I should be checking? It is just so hot and soupy out, and I am not supposed to be outside long, the obvious is a loose wire caused by the quick oil place, or a misplaced or blown fuse to me, what do any of you think? Could that quick exceleration have done it?
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Sunday, August 19th, 2012 AT 10:17 PM

5 Replies

Tiny
ASEMASTER6371
  • EXPERT
Output speed sensor may be bad. You need a shop with a scan tool, that can monitor the actual signal to verify failure.

Roy
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Sunday, August 19th, 2012 AT 10:20 PM
Tiny
SHADOWBOXER50
  • MEMBER
I read where there is more than one speed sensor. I think it said there are two on the driver's side, and they are about $83 and some change each.
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Monday, August 20th, 2012 AT 3:22 PM
Tiny
ASEMASTER6371
  • EXPERT
Only 1 sensor for the speedometer. The other 2 are input and output speed sensors that have nothing to do with the speedo

Roy
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Monday, August 20th, 2012 AT 5:00 PM
Tiny
SHADOWBOXER50
  • MEMBER
I give up, thieves broke into the mechanic's shop, stole another mechanics tools among them, the cord to check the OBD 1 cables. Jump wire doesn't work because I think the check engine light may be burned out. I get several answers as to the problem. One person says it is speed sensor in the transmission, another says it is in the tires having to do with the ABS system. We do not have a Lexus dealer in Tallahassee, the nearest is 3 hours away in Jacksonville. I know it is a Lexus, but my wife picked it out, I love the organization and scale as to how it is designed, but I swear, I hate the car, it is causing me to lose my mind. Today, it started that idling high and no A/c again, and then that O/D light stopped flashing. We burned up for miles in traffic and then, it went to working again and that O/D light went to flashing, and at no time did that speedometer work. Most of the mechanics in Tallahassee are just here to take the college Kid's money. I have the internet link to jumping out the wires at the terminals under the dash and the hood as well. Is there a way to hook up a test light instead of using lights on the dash to check diagnostic codes?
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Wednesday, August 29th, 2012 AT 11:49 PM
Tiny
KEN
  • ADMIN
Hello,

Here is a guide to show you how to runt he codes in the car

https://www.2carpros.com/articles/lexus-trouble-codes-obd1-1990-1995-code-retrieval-procedure

Please let us know what you find.

Cheers, Ken

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Wednesday, January 24th, 2018 AT 3:00 PM

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