[Mach1]

is anyone familiar with a 1670 code, Can a plug in chip effect this signal line?

Any info will be appreciated.

 

[bnvcrows]

Go here http://www.thedieselstop.com/faq/9497faq/maintenance.php3

hope this helps

 

[rustler]

I don't know if a chip can effect this.

I found a shorted wire in between the idm and the pcm causing this code before.

Another time, worked on one for days looking for a short or bad pin, replacing the idm fixed it. Idm was installed in a donor truck, same code diff truck.

On a 97 fixed a bad pin, ran fine for 2 days code came back, replaced pcm because the idm checked out fine.

A good multi meter and a lot of patience.
Hopefully some one more helpfull/knowlegable will chime in....R

on edit; Also found a bad pcm ground once.

 

[Mach1]

Yep, thats it, the ef signal between the PCM and the IDM. So it can be a bad IDM, or a bad PCM, or a bad wire/lose connection..Rustler, sounds like you have been there before.

Customers truck just worked on by a shop, area-parking brake. So, I put 2 and 2 together and believe it is related to work on truck. Guess I have to dig deeper, and AGAIN fix others work.. THANKS GUYS..

P.S. pulled chip to see if that was it.