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Dividing a Vehicle Speed Signal

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=146138
Printed Date: May 02, 2025 at 9:51 PM


Topic: Dividing a Vehicle Speed Signal

Posted By: ultm8z
Subject: Dividing a Vehicle Speed Signal
Date Posted: April 12, 2020 at 12:36 PM

Long story... but here's what I'm trying to do..

My VSS is a sine wave output.   I'm trying to split the VSS high-side signal to run both the ECM (which requires a sine wave) and an Autometer speedometer.

When I tap the Autometer speedometer into the VSS high side, the speedometer works great. But the ECM reads zero at any speed.   Almost seems like the speedometer is "hogging" the signal.

Thoughts?

The speedometer can output a 0-5V square wave signal, but the ECM can't use it.


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