Viper 5102 starts 3 times and shuts off

This just started a few months ago and the alarm/remote start has been installed for over a year without any problems. It's installed in a 2010 Ford F150. It will start and shut off 3 times in a row and doesn't do it all the time, about 90% of the time. From a little research I did it might be a tach signal problem but not sure where to start to diagnose the problem.

Is it set up for tach?

howie ll wrote: Is it set up for tach?

What does that mean? There is no wire to the tach. But it worked for over a year the way it was.

Needs to be connected and programmed for tach, might help. Did you install it?

howie ll wrote: Needs to be connected and programmed for tach, might help. Did you install it?

I did not install it. I thought virtual tach would be fine and I am almost positive the tach wire isn't hooked up. I'm confused why it worked for so long and all of a sudden it stopped.

Tach always works better but if you can't do what I suggested surely you're better off going to the original installer rather than posting here because normally the next question would involve diagnostic testing of various components, such as the bypass.

howie ll wrote: Tach always works better but if you can't do what I suggested surely you're better off going to the original installer rather than posting here because normally the next question would involve diagnostic testing of various components, such as the bypass.

I know how to diagnose electrical components and I already was suspecting the dball2. I'm a mechanic just not familiar with alarms. If the first step in diagnosing is hooking up a tach wire then I can do that. I was only looking for a place to start diagnosing.

OK, poor tach signal if it's derived from the DB-ALL, also is this correctly by-passing a factory immobiliser if fitted? If you go to Xpresskit.com enter vehicle make model and year it will direct you to the DB-All 2 and then you can download the correct wiring diagram and take it from there.

Ok. Thank you. I will post back when recheck the wiring.

Make sure that you read that install guide at the it gives diagnostics for the DB-ALL via it's LED's.