How does tachless work?

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Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=81206
Printed Date: May 11, 2025 at 8:18 PM

Topic: How does tachless work?

Posted By: JasonBlalock
Subject: How does tachless work?
Date Posted: August 04, 2006 at 4:16 PM

Is it a measurement of the voltage, EM noise, RF noise, or AC noise?

Thanks

Replies:

Posted By: Hornshockey
Date Posted: August 04, 2006 at 4:19 PM

generally it measures voltage and looks for the jump from ~12V to ~14V to verfiy that the engine is running

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

Posted By: JasonBlalock
Date Posted: August 04, 2006 at 4:22 PM

Thanks. Are AC, RF, or EM noise increases ever calculated?

Posted By: supersix4
Date Posted: August 04, 2006 at 4:28 PM

JasonBlalock wrote:

Thanks. Are AC, RF, or EM noise increases ever calculated?

If you mean are they ever used as a method to determine weather or not a vehicles engine is running? Nope, is't A/C Voltage to measure Tach or Voltage change to do it "Tach Less".

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Posted By: JasonBlalock
Date Posted: August 04, 2006 at 4:33 PM

Thank you both for your time.

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