1998 T-100 Toyota cruse control will not engage. The dash indicator comes on when the switch is on but it will not engage. I have a check engine lite whose code is speed sensor. I replaced the transmisson speed sensor , no help. I have not been able to find an electrial drawing that shows if their is more than one speed sensor.

Many times a bad brake light switch will prevent the cruise from engaging. But your best bet is to get a shop manual and follow the step by step tests. Check with your local library to see if they have online access to a repair manual

Check your battery cables and block ground connections for corrosion and tightness . A neutral safety switch only kills starter power .

Check fuse for transfer case. Check electrical connector to transfer case. Listen for transfer case motor running when switch is activated.

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: -------

Check Engine Light Reset Procedure?

http://whoisbyme.blogspot.in/2012/06/check-engine-light-reset-procedure.html

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Check Engine Light ON?

http://whoisbyme.blogspot.in/2012/06/check-engine-light-on.html

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Intermittent Check Engine Light?

http://whoisbyme.blogspot.in/2012/06/intermittent-check-engine-light.html

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WHY Check Engine Light On car?

http://schematicsdiagram.blogspot.com/2011/06/check-engine-light-on-car.html

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Check Engine Light, VSC light and Traction Control Light ON?

http://whoisbyme.blogspot.com/2012/06/check-engine-lightvsc-light-and.html

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Check engine light flashing?

http://technoanswers.blogspot.in/2012/02/check-engine-light-flashing.html

Service engine soon Light Turned OFF after Jump Start?

http://whatisbyme.blogspot.in/2012/06/service-engine-soon-light-turned-off.html

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After replacing throttle body the Check engine light starts blinking?

http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html

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2005 Chevy Impala: Service Vehicle Soon Warning Light?

http://whoisbyme.blogspot.in/2012/06/2005-chevy-impala-service-vehicle-soon.html

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Malfunction Indicator Light ON

http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html

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Check power-train message with orange engine light came on?

http://howtobyme.blogspot.in/2012/02/check-power-train-message-with-orange.html

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2007 Toyota Highlander Hybrid: Yellow Check Engine Light ON dash?

http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html

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1999 Toyota Tacoma: Check Engine Light Read Code P0171?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-tacoma-check-engine-light.html

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Car Runs Fine But Check Engine light is ON?

http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html

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Check engine light with codes P2195 and P2197?

http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html

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How to Read Codes from Check Engine Light?

http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html

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Vehicle smog test failed Due to NO MIL/check engine light?

http://schematicsdiagram.blogspot.com/2011/12/vehicle-smog-test-failed-due-to-no.html

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OBD Code is cleared but check engine light will not RESET?

http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html

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Car jerks while going uphill and Check engine light is ON?

http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html

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Toyota Camry Check engine light flashes while driving?

http://schematicsdiagram.blogspot.in/2012/02/toyota-camry-check-engine-light-flashes.html

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These details will help.

Thanks.

Check for a broken plastic piece under the hood on the throttle control. Top, Back right of the engine. Probably will see the cruse control cable sitting there disconnected.

check wiring further back in boot rh side there is little black box that plays up fitted there.check this cant get anymore must by pass box now.

check brake switch under dash above the brake pedal. See if sensing wires are broken . or if it uses a duplicate switch sensor check it is engaging properly. Also check you tube on possible failures.
Also in the engine bay the cable from the accelerator petal will attach to the trottle on the engine. Check for another cable at this location from the cruise control and check the cable is not broken .

Check brake globes are functioning and are not blown as well.

look in your owner's manual for the location of the cruse control fuse it is different from other fuses usually much larger

that actual cruise control switch is out. happened in my roadmaster.

Check the air control hoses for the cruise control.