SurWagon

I'm reposting this here to see if I can get some more specialized help.

RED/BLUE pcm from 2003 lq4 reprogrammed by wait4meperformance to delete VATS, EGR and rear O2. Swapping lq4/4l80e/np241c into a Jeep Grand Wagoneer.

Blue pin 58 to OBD2 pin 2 showing 0.05~0.4v fluctuating in RUN

OBD2 4 & 5 grounded to common point on firewall

OBD2 16 is hot at all times 12.6v (run through silverado fusebox)

Engine starts up and appears to runs. Idle is high, but no tach yet to see. However, when I hook my ELM 327 (serial to pc, using a USB-serial adapter, works on a subie and ranger) up it says failure to detect protocol.

I'm confused why it doesn't work.

Any ideas?
-Nick

roughneck427

iTrader: (12)

Check your schematic I had an issue pin 58 was serial data to BCM and pin 59 was for serial data to aldl.

SurWagon

I was going off of the lt1swap page. I'll definately try swapping them though.

SurWagon

So I replaced the dark green wire with a completely new one with less resistance....didn't change.

Completely removed the yellow pic 59.....no change.

Next to try pulling signal from pin 59 to the OBD2 port.

SurWagon

poop on a stick. That didn't work either.

I have another pcm that I pulled from something in the junkyard. Could I swap that one in and see if I can read it with the OBD2 scanner? I think it was out of an 04 with a 5.3L.

I really want to be able to read it before I take the first test drive...this is killing me!