Tach lead out of the ECM

[Catwood]

I need to tap into that lead for my G2x and don't have a wiring diagram. Anyone know which lead to splice for the tach signal?

thanks,
Carl

 

[Steve-Indy]

Might help to know the year of your Viper...and I will look it up in the appropriate Service Manual.

P.S. As covered in lengthy posts on the Raptor...if it's a shift light that you plan to install, some shift lights use coil signal, some can use tach signal.

 

[Catwood]

Ok..I'll search Raptor

My car's a 2000 GTS. sorry....

 

[Steve-Indy]

Thanks for the update.

From the 2000 Viper Service Manual...page 8W-80-37 (the section on pin-outs)

Tach signal is Cavity 31 of the PCM -C3 (this module is a gray color)...pin 31 has a GY/LB (gray/light blue) wire...which is confirmed as the signal wire to the tach on page 8W-30-11.

If you need ignition coil driver wires (they come off of PCM-C1 (which is a black color)...

Cavity 1...coil driver #4 driver...YL/GY wire

Cavity 3...coil driver #3 driver... RD/YL wire

Cavity 5...coil driver #5 driver...DG/GY wire

Cavity 7...coil driver #1 driver...BK/GY wire

Cavity 9...coil driver #2 driver...DB/TN wire

 

[Catwood]

Thanks....the gray blue one should work for thr GX2.

Thanks again,
Carl

 

[Dave's Big Brakes]

Thanks....the gray blue one should work for thr GX2.

Thanks again,
Carl

Hey Carl,

Can you take good detail pictures of this tach wire deal Guess who needs to know

Thanks
Big Brake Dave

 

[Steve-Indy]

Good luck...often times it can be trial and error.

 

[dave6666]

On my '01 GTS I picked it up in the footwell area.

Grey w/ light blue stripe.

You must be registered for see images

 

[Viperless]

Thanks....the gray blue one should work for thr GX2.

Thanks again,
Carl

The gray/blue wire WILL work for the G2X. That's where I tapped in for mine.

 

[Catwood]

that's good info...thanks. I didn't get it done on Tuesday, other work needed first. I'm going to try and do it on Friday morning before I leave.

I assume you set your G2x to a 5 cylinder? Is that true?

 

[Viperless]

that's good info...thanks. I didn't get it done on Tuesday, other work needed first. I'm going to try and do it on Friday morning before I leave.

I assume you set your G2x to a 5 cylinder? Is that true?

Yes, tach pulse or whatever it's called should be set to 5.

 

[ruckdr]

Pictures of Tach wire from PCM connector: