The Haynes manual I have doesn't show another speed sensor either. However, if your speedometer is working then it must have either a speedometer cable or another speed sensor of some type. My 1987 Toyota Supra had a speedometer cable and the speed sensor was in back of the speedometer. It used a spinning disk attached to the cable. The disk broke and left me without cruise control. I don't know if you have a similar arrangement in addition to the transmission speed sensor.
I don't believe the cruise control will engage with a speed sensor DTC set or a faulty speed sensor. So the code must be erased even if you fixed the problem. If you erased the code after your fix and the code returned, try to determine if the speed sensor is getting the 5 volt reference voltage from the ECM. If not, then either a wiring problem or faulty ECM.
Check
engine light comes on and off, these are indication that there is some
error code stored in your vehicles ECM. The engine module computer
needs to be scanned. These will give the code and as per the error code the
further problem can be detected and confirmed. The engine light
indicator blinks or remains steady on dash when engine computer
noticed any problem with any engine electrically operated components.
For
more help, I suggest you to refer the help links provided below. These will let
you know more about which areas to look, check, when there is engine light
coming up on dash panel.
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Click
the link below: -------
http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html
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http://howtobyme.blogspot.in/2012/02/check-power-train-message-with-orange.html
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http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html
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http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html
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http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
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http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
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http://schematicsdiagram.blogspot.com/2011/12/vehicle-smog-test-failed-due-to-no.html
http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
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http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html
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http://schematicsdiagram.blogspot.in/2012/02/toyota-camry-check-engine-light-flashes.html
-------
These
details will help.
Thanks.
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