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Cruise Control Speed Transmitter
Posted by Trionic900 (more from Trionic900) on Mon, 14 Jan 2002 15:52:29
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

       My daughter's '92 900S 5 speed has an inoperative cruise control. I 
performed all the tests outlined in the Bentley manual as well as those given 
on the excellent Townshend website.  It appeared to be the cruise control 
ECU, so I ordered a used one from a NINES advertiser. When I installed it, 
the cruise control still did not work. The advertiser is sending me another 
used one- hopefully this one will be okay. Evidently, these are common 
failure points on C900's.
       However, I am haunted by the feeling that the speed transmitter 
mounted behind the instrument cluster may be bad. Both Bentley and Townhend 
say to check for voltage and ground in the connector to the transmitter (ok) 
AND a voltage signal in the third (blue) wire going from the connector to the 
cruise control ECU- only when the car is moving. I have about 6.8-7.2 volts 
to the ECU at any speed above a crawl. The voltage does NOT increase with 
road speed. I assume the ECU measures the frequency of the AC (?) coming off 
the transmitter. Am I correct?
       What should I measure as output of a working cruise control speed 
transmitter? Email suggestions to-- Trionic900no39sdcx6spamx782cs.com. Thanks.
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