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Learning tach signal

Printed From: the12volt.com
Forum Name: Car Security and Convenience
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=43967
Printed Date: July 13, 2025 at 5:09 AM


Topic: Learning tach signal

Posted By: daniel2002p
Subject: Learning tach signal
Date Posted: November 28, 2004 at 3:19 PM

Hi everybody

I have a 2004 Toyota Tacoma 3.4 V6 and installed the Autopage RS855LCD on it.  It works fine but when you RS it it shuts it down due to a "low tach signal".  I have measured the tach wire used (lt.GREEN/ black at ignitor) and has about 1.5v AC when idle, and the alarm is telling me that it is too low.  I have tried the injector and the tach behind the instrument cluster but they only have 0.5 when idle.  Can anyone tell me how to resolve this problme?



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2005 Toyota Corolla S
    1.8L VVT-i I-4
Always double check your wires with a DMM!!!
Do Not Use A Test Light!!!
MECP Certified Installer!
Best Buy 665 - IN IT TO WIN IT! TEAM MOBLE!



Replies:

Posted By: daniel2002p
Date Posted: November 28, 2004 at 10:39 PM
Also, it will only learn the tach when it is more than 1.6V

-------------
2005 Toyota Corolla S
    1.8L VVT-i I-4
Always double check your wires with a DMM!!!
Do Not Use A Test Light!!!
MECP Certified Installer!
Best Buy 665 - IN IT TO WIN IT! TEAM MOBLE!


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