low or no rpm
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=118955
Printed Date: July 06, 2025 at 2:11 AM
Topic: low or no rpm
Posted By: nhoff82
Subject: low or no rpm
Date Posted: December 30, 2009 at 2:11 PM
I installed a viper 5701 with idatalink ads-al gm1 into a cadillac deville 2001. The alarm, locks, trunk work. The unit tries to remote start but starter never engages. the onboard diagnostics show low or no rpm. I have tried a few different settings, but to no avail. thanks
Replies:
Posted By: howie ll
Date Posted: December 30, 2009 at 4:08 PM
To what have you wired your tach lead to and have you programmed it?
Posted By: kgerry
Date Posted: December 30, 2009 at 4:30 PM
where are grabbing tach? from the vehicle or the ADS module?
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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: nhoff82
Date Posted: December 30, 2009 at 4:56 PM
i tried from the vehicle and the datalink
Posted By: nhoff82
Date Posted: December 30, 2009 at 5:29 PM
right now i am connected from the rs to an injector wire for tach.
Posted By: Chris Luongo
Date Posted: December 30, 2009 at 5:54 PM
You can get tach right at the front edge of the driver's carpet, near where your left foot would be, in a white wire in the harness that comes in through the firewall.
But an injector should be OK too.
1. Can you program tach to the unit?
2. If you try to enter pit-stop mode, then turn the key to Off and remove the key, does the car stay running?
Posted By: nhoff82
Date Posted: December 30, 2009 at 9:53 PM
It did not stay running. what should i be programmed to- virtual tach, voltage, off, or tachometer? Here is how I have it wired in case i messed that up. H3 harness pink-ignition RED / white, red, RED / black - 12v violet and green to start wire orange to acc pink/white to ign 2 relay out harness- blue rs status to ground when running on datalink
Posted By: jim hunter
Date Posted: December 30, 2009 at 10:23 PM
if your hooked to a tach program it for tach, NOT virtual tach which is default on new vipers i believe and on your green and purple wires to starter wire do you have cars wire cut and green going to key side purple to motor side?if not you need to do this it is for antigrind so wire must be cut, or if antigrind isnt wanted/needed dont use green just tie purple to the cars starter wire
Posted By: nhoff82
Date Posted: December 31, 2009 at 12:28 AM
thanks everyone for your help, i got it going
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