low 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=68124
Printed Date: September 09, 2025 at 2:58 AM
Topic: low tach signal
Posted By: origin
Subject: low tach signal
Date Posted: December 11, 2005 at 10:12 AM
i have installed a prostart ct3400 into a 2001 gmc sierra denali, i have done the tach program procedure but when started on the remote the starter stays engaged, i tried a tach signal from a injector, a coil pack and the ecm. i believe the problem is to low of a signal I'm only getting a bout .5v ac the install manual says it needs 1.8v ac at idle or it will over crank.What the heck am i missing. where can I get a stronger tach signal from or am I just missing the boat??
Replies:
Posted By: xttech
Date Posted: December 11, 2005 at 11:58 AM
I have the same model and it does sound like the tach signal, because when i wasnt getting the right wire off of the coil, the starter would stay engaged until the RS shut the car off. I then found the right wire off of the distributor and now it starts, better than when i start it myself,,,,heheh Cranks it up, and instantly shuts the Starter off. From what I read also ensure there is a good ground.. I just went right to the battery ground. good luck with it
Posted By: fingaz22
Date Posted: December 11, 2005 at 1:01 PM
well seeing you have coil packs the distributor advise wont help. but the ground is diffently something you need to check. where are you getting your reading from when you say it's a half volt ac? are you probing the components them selfs? or are you checking at the remote start connection? and did you get the signal after or befor the ecm?
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JUST ONE MORE AMP!!!
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sub amp,power 1000 the terminator.(1992).
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Posted By: kgerry
Date Posted: December 11, 2005 at 3:47 PM
i almost always grab tach at the cluster on GM full size trucks... never had a problem yet....
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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: origin
Date Posted: December 11, 2005 at 5:22 PM
where is a easy spot to pick up tach wire at the cluster
Posted By: xttech
Date Posted: December 11, 2005 at 8:01 PM
origin wrote:
where is a easy spot to pick up tach wire at the cluster
Maybe this will help: https://www.the12volt.com/installbay/forum_posts.asp?tid=7482 TACHOMETER|white *5 | |ECM *3
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