1999 Honda Civic VSS signal

Printed From: the12volt.com
Forum Name: Cruise Controls
Forum Discription: Cruise Control Settings, Tach Signal, VSS PPM(Vehicle Speed Signal Pulses Per Mile), Vacuum, Brake, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=10194
Printed Date: May 13, 2025 at 1:30 PM

Topic: 1999 Honda Civic VSS signal

Posted By: cookster
Subject: 1999 Honda Civic VSS signal
Date Posted: February 28, 2003 at 7:44 AM

Hello,

I have the wire for the VSS signal (from the Rostra site), but I don't have access to a scope to check out what the signal on that wire actually is... Is it a 0-5v pulse signal where the pulse length changes with speed or is it a sinusoidal signal where the frequency/voltage of the signal changes with speed? I've heard that both types of outputs are possible... Does anyone know?

Andrew

Replies:

Posted By: rizzo8
Date Posted: April 01, 2003 at 7:36 AM

its a 0-5V square pulse train that changes frequencies with speed. The faster you go, the higher the frequency of the pulse. If you wanna check, put an LED at the VSS wire and ground the negative lead. Drive around at different speeds and see how the pulse changes frequencies.

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