Testing tach wire???
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=12849
Printed Date: May 18, 2024 at 5:27 AM
Topic: Testing tach wire???
Posted By: emorse2323
Subject: Testing tach wire???
Date Posted: April 28, 2003 at 12:10 PM
What should the tach wire test theres four of the same color so when I go to test it how should the right one read?
thanks
Replies:
Posted By: Derek
Date Posted: April 28, 2003 at 4:32 PM
What type of Vehicle?
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Posted By: jrilla
Date Posted: April 28, 2003 at 7:19 PM
Between 1 and 6 volts AC and increase when the gas is pressed. Yes I mean AC, not DC.
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J Rilla
Owner/Installer
Posted By: emorse2323
Date Posted: April 28, 2003 at 7:23 PM
its on a 2002 chevy 1500 suppose to be a white wire and theres about 4 of them.
Posted By: Velocity Motors
Date Posted: April 28, 2003 at 11:20 PM
Look for the wire at the ECM which is located near the battery, down low, between the fender and the fan under the black plastic cover. On the 4.3L, the tach wire is at pin 20 in the connector labeled 'red', and VSS wire is at pin 3 in the connector labeled 'black'. On the 4.8L, 5.3L, and 6.0L, the tach wire is located at pin 10 in the 'red' connector, and VSS wire is located in pin 50 of the 'red' connector.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: elrayodesinaloa
Date Posted: April 29, 2003 at 6:29 PM
easiest way is by using an ANALOG vm and test the wire at the coil, or a non-common wire at the injectors. accelerate and you will see the needle moving showing you difference in AC voltage. Will look like your RPM meter inside your vehicle, goes up as you accelerate ,and go down as you de-accelerate. piece of cake
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Posted By: dfiddy
Date Posted: April 29, 2003 at 7:42 PM
I've used injector wires on most of those new chevy's....is this wrong? I've heard that some brands recognize injector wires better than a coil wire and vice versa, who's right?!
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