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=5726
Printed Date: May 18, 2024 at 12:48 AM
Topic: tach signal
Posted By: grymus
Subject: tach signal
Date Posted: November 21, 2002 at 2:20 PM
Can someone tell me the best way to test a wire for tach signal. What values should I expect ad what to test in? AC voltage?
Replies:
Posted By: skerr
Date Posted: November 21, 2002 at 2:21 PM
AC voltage, you are looking for 1-5 volt ac
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Shawn
Posted By: PLAYER69
Date Posted: November 21, 2002 at 3:11 PM
It should also increase with enging rpm.
Posted By: grymus
Date Posted: November 21, 2002 at 8:17 PM
I am trying to get it at the ecm but am unsure what one it is. I found a three white wires but when i test the ac voltage i get nill. i was told it was at pin 10 in the red connector. I tried all the white wires i found going to the ecm and no luck. any place else i can get it EASILY? Also if you unplug the wires from the ECM and then reconnect them does it cause any damage or lose any setting or anything?
Posted By: SOUND PRESSURE
Date Posted: November 21, 2002 at 10:21 PM
Do you have your dmm set to read AC voltage?
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Sound Pressure
You know you have the right amount of pressure when your eyes start to water! Now you've got Juice!
Posted By: dommo_g
Date Posted: November 21, 2002 at 11:57 PM
I didn't catch what type of car you're working on, but you should be able to find tach wire(s) at the ignition coil where the spark plug wires connect. There may be a plug in harness that comes from the ECM. Example: Dodge Neon-3 wire harness at the coil has 2 tach wires.
Posted By: grymus
Date Posted: November 22, 2002 at 8:08 AM
I have the AC voltage option set on the DMM and I have a chevy silverado 2500HD with 6.0L. I wanted to grab the wire at teh ecm because it is easier to tuck away and keep out of sight then. I was told pin 10 of the red harness but how do i count the pins...do i start from the top or the bottom?
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