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Date: 18 Sep 2002 07:33:13 -0700
From: osterndnopsam.com (Dale O)
Subject: Re: Cruise control


That would be difficult to test with my DVM then. I was going by the explanation in the Townsend sight where he describes the sensor producing a varying voltage while the car is driven. It would really make more sense to change the duty cycle than varying voltage, so what you say about the sensor working is probably correct. I've eliminated everything now except for the control module, though I haven't found anything obvious in the module (cracked traces, burnt components, etc). Guess my next step is to replace the module. KeithG <noonenopsamspring.com> wrote in message news:<am7n9t$d1b$1nopsam9.atl.mindspring.net>... > Dale, > > the speed sensor does not work as a voltage device, it is frequency > device. As you speed up, its frequency increases. It makes perfect sense > that the square wave increases as the duty cycle increases to a point > that it doesn't seem to go up any more. I have a DMM which has frequency > on it. I think that you need one of these or an oscilloscope to see if > it is working properly, but from what you have said, it sure seems like > it is OK as these generally work or don't work. The sensor is part of > the speedometer. > > KeithG > > Dale O wrote: > > I finally figured out that the speed sensor to the cruise control is > > not operating correctly. It goes from 0 - 5.88V and stops there > > (maybe 40mph). At speeds beyond that it stays at 5.88V. Can anybody > > tell me where it's located and if it's behind the dash (please tell me > > it's not!!!), how to replace it? > > > > Thanks! > > > > > > osterndnopsam.com (Dale O) wrote in message news:<758a984c.0209070640.3afc02e0nopsaming.google.com>... > > > >>Thanks for the sight. A lot of great info there. I pulled the > >>control mod and checked for poor solder joints, cracks, or fried > >>components but all looks good. I'm going to tackle it now using his > >>advice and see what I find. > >> > >> > >>KeithG <noonenopsamspring.com> wrote in message news:<3D78FE5B.6060806nopsamspring.com>... > >> > >>>see www.townsendimports.com -> technical docs, electrical, cruise. > >>> > >>>KeithG > >>> > >>>Dale O wrote: > >>> > >>>>Hope someone can help me out with a cruise control problem on my '87 > >>>>9000T. Cruise will not work at all. Fuse OK. Tested switch on stalk > >>>>and looks OK also. Vacuum pump not working (it is operational though) > >>>>and signals do not seem to be getting to it (no 12V or control). I do > >>>>not have a wiring diagram, so I'm troubleshooting blind. Does this > >>>>sound like a bad module? Any way of testing? > >>>> > >>>>Thanks! > >>>> > >>>>Dale Osterndorf > >>>>osterndnopsam.com > >>>

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