tach problems on a 2000 Cheverolet truck

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gcar80

Member - Posts: 7

Joined: February 11, 2004

Location: United States

Posted: February 18, 2004 at 6:19 PM / IP Logged

Where do I find a tach source for a remote start alarm. The truck has individual coils for each spark plug and I cant find the white wire to tap onto. Can I find this wire under the dash. I have looked at this sites vehicle information and it says a white wire at the coil but I can't seem to find it. Could it be possibly be at the ECM?

magyver

sparkie

Platinum - Posts: 2,061

Joined: November 06, 2003

Location: Canada

Posted: February 18, 2004 at 6:41 PM / IP Logged

The white tach wire you are looking for is found at the gauges/instrument cluster. Pull the trim panel surrounding the cluster, radio and climate controls rearward. The panel is clipped in place. Remove the four screws surrounding the gauges. The plug going into the gauge cluster has one white wire in it. This is the tach signal from the engine's PCM. You could also use the odd colored wire at any of the coils for a 1 cylinder tach signal. The coils have four wires going to them. Three wires are the same color at every coil and one is different at each coil. The odd one is the tach signal for that cylinder.

sparky

gcar80

Member - Posts: 7

Joined: February 11, 2004

Location: United States

Posted: February 18, 2004 at 6:46 PM / IP Logged

I kinda figured that the odd wire to the coils was the tach source but I knew that there had to be some other way thanx

magyver

gcar80

Member - Posts: 7

Joined: February 11, 2004

Location: United States

Posted: February 18, 2004 at 6:46 PM / IP Logged

I kinda figured that the odd wire to the coils was the tach source but I knew that there had to be some other way thanx.

magyver

gcar80

Member - Posts: 7

Joined: February 11, 2004

Location: United States

Posted: February 18, 2004 at 6:51 PM / IP Logged

I kinda figured that the odd wire to the coils was the tach source but I knew that there had to be some other way thanx. The alarm that I have is the Audiovox Prestige Platinum Remote Start/ Full Alarm System. It has a 4 pin plug thats called the Auxiliary outputs. All it reads is pulses before and after start, after shutdown, and during crank. The book doesn't say what it goes to but Im assuming that its for flashing the parking lights at those times of remote start

magyver

gcar80

Member - Posts: 7

Joined: February 11, 2004

Location: United States

Posted: February 18, 2004 at 6:53 PM / IP Logged

Also the alarm only has one door trigger wire input and at the BCM I found an individual wire for each door pin

magyver

kgerry

Platinum - Posts: 3,455

This member consistently provides reliable information

Joined: February 07, 2004

Location: Saskatchewan, Canada

Posted: February 19, 2004 at 1:03 PM / IP Logged

either go to the dome light for a single trigger or diode isolate the wires at the BCM and use them all

Kevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

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tach problems on a 2000 Cheverolet truck

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