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Cruise control shows missing speed sensor signal but speedo is fine 900 1993

posted by  lrisius on  Thu Jun 26 04:25 CST 2014
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last visit: Sun Aug 17 05:59 CST 2014
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Hi,
Our 93 940 cruise control has been having intermittent issues. Sometimes it sets the speed and works, other times it doesn't. Seems to work for a while and then it doesn't for a while. I originally thought it was the brake switch so did the o-ring replacement as described in the FAQ. However, that hasn't fixed it and I have pulled the OBD code which indicate a speed sensor problem. I have not seen any issues with the speedometer. From what I have read, they use the same sensor so it seems like that must be ok. I've also run the diagnostics on all the cruise control switches and they all worked but given the intermittent nature, I could just have hit them at the right time.

So any thoughts on the missing speed signal? How is it fed to the cruise- does it come from the speedometer?

Thanks!
Lyle






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