2000 Toyota Avalon Warning lights

Tiny
GHP88
  • MEMBER
  • 2000 TOYOTA AVALON
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 91,000 MILES
While driving down the road the ABS, brake and check engine light came on and also the speedometer quit working. Had it scanned and it showed that the speed control sensor was bad. I bought a new one from Toyota, installed it and still have the same problem. Had it rescanned and it indicated the same thing, speed control sensor. Can you help!
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Saturday, November 8th, 2008 AT 9:30 AM

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Tiny
RACEFAN966
  • EXPERT
Ok here is how it works, The sensor detects wheel speed and sends the appropriate signal to the ABS ECU. The ABS ECU converts it and sends a 4-pulse signal to the instrument cluster, which then outputs the 4-pulse signal to the ECU. The ZEcu determines the vehicle speed bassed on frequency of pulse signals. DTC (diagnostic trouble code) is set when the ECM does not detect a signal while the vehicle is in motion. Possible causes are as follows. Open or short in vehicle speed sensor circuit, ABS speed sensor, Instrument cluster malfunction, ECM malfunction, ABS ECU malfunction or worst case internal tansaxle malfuntion. SO tests need to be done. And it is testing the ecm so if you do not feel comfortable doing this then take to a trusted mechanic armed with this information if needed I can go through the test procedure and include a wiring diagram as well. Let know what you would like to do. Ok.
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Saturday, November 8th, 2008 AT 9:01 PM
Tiny
IMPALASS
  • EXPERT
Hello

I have looked all over to see where the tie of the ABS, Brake and speedometer connects. The only place they all connect is the combination meter. Which looks like the cluster itself. There are extensive tests it looks like you can perform with a volt meter if you would like those.

As for the ABS and Brake warning light. Please check your brake fluid and make sure it is where it should be. This will set the light off and make sure your parking brake is all the way off. I would set it then release it.

The only thing I see with the speed sensors is you have the vehicle speed sensor which you keep replacing and there are speed sensors on all the wheels. I can send you the checks for those if you would like.

You can remove each wheel and really inspect the sensor and the rotor really good for any damage, missing or damaged teeth. What I mean by that is your rotors will have a gear on them. The speed sensor reads the teeth as they rotate. If one is clogged with dirt, a sensor with a wire that is pinched etc. Look them over really good.

If you can get me the exact code and what it says that may help too. You can go to Auto Zone or O'Reilly's and for free they can pull the codes to the car. Most important. Once they check your codes, if they find something and you don't get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 Sensor bad. Then make sure you give us all of that. While there for free also they can bring their tester out and check your battery, alternator and starter.

Please do the above and let me know if you want all the checks and I will send them to you.
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Saturday, November 8th, 2008 AT 9:20 PM

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