Remote start problem viper 790xv
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=25498
Printed Date: May 18, 2024 at 6:13 AM
Topic: Remote start problem viper 790xv
Posted By: kenhamr
Subject: Remote start problem viper 790xv
Date Posted: January 29, 2004 at 4:07 PM
Hi, I need some help. I installed a Viper 790 xv in my chevy diesel van 1990. And the alarm work fine. But the van has not a tech. I connected the tech wire violett / white to + in the car and adjust the alarm unit to read voltage sens. When I use the remote control, the car start ok, but in five / teen second the car started again. If I disconnected the voltage wire is make not a difference. What is wrong? Ken ------------- Ken
Replies:
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 4:19 PM
you dont have to put that tach wire on anything leave it disconnected if not using tach.
YOu were not suposed to connect that to a positive wire this is a "AC" input so the unit can monitor pulses or rpms! Never connect this wire to anything when in voltage sensing. di dyou connect a glow plug input???
I would run a tach wire to a good tach source especially in a diesel!!
Im not sure if you have damaged the unit i dought that, but you will need to run that PURPLE / white wire to a tach source and program it the problem should then be fixed.
what kind of car do you have so i can supply tach info on it?
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 4:22 PM
i show a wire that is white at the coil on top of teh motor this should be a good tach reference fo rthe viper. Check this wire with a voltmeter in the ac scale 10 volts or 20 would be fine. probe the white wire with the red lead and ground the black start the car this wire should read 2 -6 volts or so in ac and voltage will raise with engine speed.
Posted By: kenhamr
Date Posted: January 29, 2004 at 4:42 PM
It's a chevy 30 diesel 6,2 full size van 1990. I dont find any tech signal because its a diesel without tach. Det wire to wait to start in not connected yet. ------------- Ken
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 4:58 PM
try this take the key turn it in th eignition till the lights come on leave it on for 10 seconds turn the key off then remote start the car see what happens .you will need that wait to start connected before this will properly start from remote.
Posted By: kenhamr
Date Posted: January 29, 2004 at 5:23 PM
Hi, the wait to start wire is not a problem. The problem is when the engine has started and run. The unit dont understand at the engine is on, and then try to start again. It's not a good sound.
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Ken
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 7:11 PM
you need a tach then you will have to find one maybe off the tachometer ! if you find a tach this will solve your problems if you cannot find a tach post back there is other ways to solve the problem.
Posted By: FRED ANTHONY
Date Posted: January 29, 2004 at 7:23 PM
Yeah I got my tach wire right from behind the gauge pod, you should be able to get it there somewhere. Use a DMM (Digital Multimeter) the wire should read 1-6volts and increase as the engine rpms increase. The alarm doesn't know the engine is running because its not getting a signal on the tach wire. Correct me if I am wrong Mobiletoys, cause you know your stuff. Fred.
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 7:39 PM
thats correct Fred> he needs a tach reference to make starter work correctly especially in a diesel.
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 7:44 PM
listen Kenhamr if you persist on using voltage sensing disconnect that tach wire as it should never have been connected if using voltage and try to reprogram the voltage level. Disconnect the unit for a while and plug back in make sure it is set for voltage and see what happens,but if it to cold you are not going to be able to start that car without tach not eficiently. That tach will be a much more reliable way of starting and if you cannot find a tach post back I can help u.
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 7:53 PM
there are other reasons to connect a tach for one --your battery may be going it will never remote start correctly if batery levels fluctuate sinse it is relying on voltage. See voltage sensing works by the unit seeing the diference from 12 to lets say 14 volts when it sees 14 volts it thinks the car is running. That is as long as your battery is in good condition weather affects the battery which will also affect the starting, GO TACH TRUST ME !!!! I will bet it is cold there too!
Posted By: kenhamr
Date Posted: January 29, 2004 at 8:24 PM
Hi.thanks for all help I asked the chevy dealer and he say it's not a tech signal on this engine. I the 790 manual i read something about voltage sense and I believed it was the last thing to do. Ken ------------- Ken
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 8:25 PM
do you have a tachometer in the vehicle??
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 8:27 PM
Is it cold there? Is the battery in good shape? Does your car have rouble starting in the cold??
Posted By: kenhamr
Date Posted: January 29, 2004 at 8:33 PM
No it's not a tachometer in the vehicle Ken ------------- Ken
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 9:02 PM
try to reset the crank time ! does it start on the first try ?
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 9:03 PM
or mess with the voltage settings on the unit ,I dont remember what they are as I dont use voltage sensing .
Posted By: mobiletoys2002
Date Posted: January 29, 2004 at 9:11 PM
Wait try to change the voltage sensing to low it is on high as default this may work . that will be about the only thing you can do in voltage sensing as well as maybe make it crank a little longer so it will start the first time. To change the setting to low go into option 3:6 i believe!
Posted By: kenhamr
Date Posted: January 30, 2004 at 5:57 AM
Hi, no problem to start the first time and voltage sense it on low but it's try to start again and again.
-------------
Ken
Posted By: Big Dog
Date Posted: January 30, 2004 at 9:15 AM
Hey Kenhamr,
If I'm not too confused, you're looking for a tach wire for a 1990 GMC van.
It will be a White wire at position A6 on the main connector of the ECM. The ECM is under the driver's seat.
Enjoy!
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Prepare your future. It wasn't the lack of stones that killed the stone age.
Posted By: ExactOh
Date Posted: January 30, 2004 at 6:45 PM
Just grab a fuel-injector trigger. The injectors are triggered with the same signal that would operate a tachometer. I typically use injector signals instead of searching for tach wires. They are always easy to locate, and voltage sensing sucks (JMO).
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