From: russotto@eng.umd.edu (Matthew T. Russotto)
Subject: Re: electronic odometers (was: Used BMW Question ..... ???)
Organization: Project GLUE, University of Maryland, College Park
Lines: 33
NNTP-Posting-Host: tea.eng.umd.edu

In article <1993Apr14.174857.28314@porthos.cc.bellcore.com> dje@bmw535.NoSubdomain.NoDomain (Don Eilenberger) writes:
}In article <1993Apr14.153740.18542@nimbus.com>, jimiii@nimbus.com (Jim Warford) writes:

}|>  There are two simple procedures for alterating any odometer.
}|> 
}|> 1. Mechanical driven odometer:
}|>     Remove the speedo cable from the transmission.
}|>     Attach a drill and run at max speed until the speedo turns over.
}|>     Continue until the desired mileage is reached.
}|> 
}|> 2. Electronically driven odometer:
}|>     Remove the sensor wire from the sensor.
}|>     Attach the Calibration out signal from an Oscope to the wire.
}|>     Run until the speedo turns over and attains the desired mileage.
}
}Dear Faster.. I kinda wonder.. have you ever tried version 2? On what?
}Since the sensor wire on a BMW feeds also into the computer.. and we
}don't know what signal voltage is expected from it.. bad things
}*could* happen... also since we don't know the pulse rate, we
}may damage the analog part of the speedo (yes.. BMW uses a combined
}instrument.. speed in analog, trip and total milage is digital) with
}the needle pegged up against the 160MPH stop..
}
}Just a thought...

You've got the oscilliscope, so you connect it up to the sensor wire
and measure this stuff.  That way you know what it expects.

-- 
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
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