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 Speedometer Problems

dale0268@ec.rr.com
Joined: 3/11/2007
Location: Cape Carteret, NC
Posts: 1

Speedometer Problems
Posted: Sun Mar 11, 2007 8:39:58 PM

 I have a 2002 Freightliner bus with a Cat 3126B engine.  My speedometer needle creeps up to about 25 - 28 at a top speed of 55 -60 mph.  I connect a prolink which indicates correct speed. I assume the speed sensor is ok because of the prolink reading. I take a chance and replace the speedometer head.  Still the same. The speedometer is driven by the ECM.  Do I have an ECM problems?  Do I need a new computer?  So far my wiring seems to be ok.



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