1972nova

iTrader: (13)

Ok so I got the nova to start and working through a SD tune with the Tuner. we have issues with both bank 1 and 2 front o2 sensors

With the key on engine running the sensors are not responding they are at the default .450ish number and as soon as you back the key to the off position and the data logger stops logging it shows the o2's respond and they show values.


A little run down

Techrods 5.3 truck harness cable drive
0411 pcm
370" LSx 4788 turbo
brand new bosch 4 wire 02 sensors
no faults for 02 sensors at all


I have an email into techrods but have not heard back yet
Just looking for some help

1972nova

iTrader: (13)

harness wires are

A- TAN
B- Purple
C- Black
D- Pink

leading into a bosch 13193 o2 sensor 4 wire translates on the o2 wiring side

a-grey
b-black
c- white
d-white

1972nova

iTrader: (13)

could the 13193 sensors be the wrong ones for my car? they are 4 wire just seems odd that both are brand new and not responding

aknovaman

iTrader: (7)

Chk for power to the o2 sensor heater wires. Likely you don't have +12 volts between the pink and black wires.

1972nova

iTrader: (13)

pink and black 12v key on

1972nova

iTrader: (13)

just weird how can I find out what wires are on the 02 sensor? am I safe to say that the black from the engine harness should goto a black wire terminal on the 02 sensor because it goes to gray

aknovaman

iTrader: (7)

Heater power and ground are interchangeable. O2 signal high and low are not.

1972nova

iTrader: (13)

well do you know how it should be wire on the o2 side?
from harness
A- tan 5v key on and key on running
B- Purple 5v key on and key on running
C- Black Ground
D- Pink 12v


I post above but its currently wired
Tan-Grey
Purple-Black
Black- White
Pink-white

Seems it has to be an o2 issue these are brand new but of the options wonder if I should of had 13444 or 13474

1972nova

iTrader: (13)

double post

1972nova

iTrader: (13)

so pretty much my bet is going to be either faulty 02 sensors (both) which would only mean to me that the sensors are not correct for my app

or

faulty ecm

1972nova

iTrader: (13)

should both tan/purple wires be seeing 5v. I thought the sensors operate 0-1v

psiconversion

iTrader: (5)

Can you read the pinout on the engine harness? The connectors should be labeled A through D. If not, post a picture. We should check the pinout.

Jon
PSI

1972nova

iTrader: (13)

**UPDATE**

PROBLEM SOLVED. In case someone else runs into this and cant figure it out like it took me forever to do.

Depending on your year of pcm and wiring harness GM used two different types of 02 sensors. Case grounded and Isolated ground, Comparing the 2 truck wiring diagrams and an fbody 411 pcm diagrams I checked the wiring and see what wire for the o2s went to what pins on the C1 blue ECM connector.

It matched the diagram for needing a sensor for case grounding

For my situation I was using a brand new bosch 13193 sensor which had a white connector. From what I reasearched the white connector was an o2 for isolated grounding sensor. My PCM was looking for a case ground to complete the circuit and I needed either an fbody sensor or a truck sensor with the black square 4 pin harness.

Went to Jegs down the street and picked up two bosch 13474 sensors for 28.99 each and fired it up and the logger immediately started reading voltage.

bczee

iTrader: (12)

Great going there !... This is why it is important to know what your using and what it came out of. Mix and Matching can lead to a lot of head banging !...

psiconversion

iTrader: (5)

Yes, the white connectors have PWM heaters in them which go back to the PCM on a BLUE/GREEN. Question, how did you even get them to fit your harenss, they arent keyed correctly.

Jon
PSI

04BlackGmc

iTrader: (19)

Good info here.

I ran into a issue just recently with the GF's car trying to find the correct o2s for it. After looking at her harness(i can't remember the place who made it it's a Full LS1 computer and harness made for swap cars) and it has the black 4 pin square connectors looks like ill be needing the 13474 truck o2s.

1972nova

iTrader: (13)

yeah glad to post as much info on here as possible. I know ive used this site to answer many questions

bczee

iTrader: (12)

Glad you figured it out... and shared the info.. thanks..

BC

Bilster

iTrader: (21)

This thread saved my bacon!!! My only concern is the Bosch 13474 for LS trucks is listed as a downstream application. But the male pin-outs with the one block out connection is the only one that will work with my stand alone conversion harness. My harness connection is like what's pictured. That doesn't match the O2 sensor that is called out for my 2000 5.3 application which is the Bosch 13193. I was pulling my hair out trying to find the proper pin-outs.