tach wire 99 alero

I've checked all three PURPLE / white wires from the ecu and have not found one that represents a tach voltage. I've also tried the white wire off the 8 pin connector on the top of the motor (2.4). Any ideas? Thanks

This is from Bulldog Sedcurity.  ( They don't differentiate between engines. )

TACH                          PURPLE / WHITE                          @ IGNITION COIL

How are you testing? 

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Soldering is fun!

I'm using my volt meter for testing. This alero has the 2.4 with the ignition coils under the top cover. There is an 8 pin harness that comes out of the ignition module that has a white wire that is supposed to be able to be used as the tach wire. When I test this wire is runs from .5 ac to 1.3 ac? I'm not sure if this is correct or if it will work for the avital 4113. I've tried using virtual tach but I still have the same problem. It will start with the remote for a few seconds and then shuts down.  I'm confident all my wiring connections are correct and my dlpkgm seems to program like its supposed to.  I'm running out of options and I'm about ready to go f%$#@ing insane! :)  Any help would be greatly appreciated. Thanks

Before assuming it's a tach issue you should temporarily put the avital into no engine checking and bump up the crank time to 1.4 seconds and see if the car stays running. This sounds like a passlock issue.

I have done some cars where the Tach signal was only 0.5 volts at warm idle.  If your signal rises with RPM's, I would give it a try with a Tach Learn.  ( The tach signal is one of the few places where you can't hurt anything by trying with a Tach Learn, either it accepts it or it doesn't. )  Most high end remote start units will sync up with a signal under 2 volts AC. 

As beegbie suggested, are you getting any security type lights on the instrument panel with the failed remote start?  ( Passlock 2 can be difficult.  Just did a '05 Colorado that wouldn't remote start but looked like it programmed OK. )

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Soldering is fun!

Thanks for the help, I will be working on it again tomorrow. I tried starting in with the key in the ignition and still had no luck.

Also.............this avital 4113 is a one button remote start. I am not able to push the lock button during the programing of the bypass module? Could this be a problem? According to the light on the dlpkgm it's progaming just like it should.

'

The "key in the ignition" test only works with transponder based immobilizer systems, your Passlock2 system is resistance based.

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Soldering is fun!

Thanks to everyone for all the help. I figured out that I had the wrong status wire hooked up. I had the blue/white from the 9 pin to the status on my dlpkgm when it should have gone to the solid blue from the 4 pin harness!

Did you mean the WHITE/ blue(-activation input) wire from the 9 pin connector? There is no blue/white on the 9 pin. If you hooked up the blue/white from the 5 pin connector it should have worked fine.

I don't remember which wire it was hooked to in the 9 pin but after hooking it up to the blue out of the 4 pin everything works fine.

Here's the location that I use for the Alero for tach. There are only two VIOLET/WHITE wires and the one to use has a thinner white tracer through it than the other.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Got it! Thanks