Plx sm afr

[LM7Tuner]

Hey I am wiring up my SM AFR and was wondering what I should connect the positive lead to for the power source. Some people tell me ignition others say the ecm. Also is there anywhere else I could ground it or should I just run it to the negative terminal.

[LM7Tuner]

no takers? Just need to know where I should connect the positive lead? (Pics would be helpful)

[mr.prick]

I use a different brand WBO2 but I get 12v power and ground from the PCM.

[LM7Tuner]

Which ports on the pcm? And did you solder some connectors or did you splice in? How do I know which one is ground and which one is positive? Anyone got a diagram?

[mr.prick]

Which PCM? :hihi:
For power and ground from the O2 harness on a 99+ LS1 (516k)
(http://forum.efilive.com/attachment.php?attachmentid=6132&d=1252335520)
You can usually tap into the fuse box directly for a switch 12v
grounds are all over.

[joecar]

That diagram shows power/ground from the vehicle harness and not from the PCM itslef... :)

You don't want power/ground from PCM itself because on some vehicle/models (GTO...?) the PCM may PWM modulate power while the engine is running, and this is not a suitable power source for the wideband.

[LM7Tuner]

I pulled the PCM and I think I'd rather hook it up to the ignition:bad:

Here are all of the junction boxes/relays under dash any idea where to hook it here?
http://img188.imageshack.us/img188/287/img3518g.jpg (http://img188.imageshack.us/i/img3518g.jpg/)
http://img27.imageshack.us/img27/8088/img3517y.jpg (http://img27.imageshack.us/i/img3517y.jpg/)
http://img17.imageshack.us/img17/7595/img3513is.jpg (http://img17.imageshack.us/i/img3513is.jpg/)

And no I haven't heard of resizing images :angel_innocent:

[LM7Tuner]

BTW this is for a LM7 on a 2003 GMC Sierra

[LM7Tuner]

Guess I might have to go through the pcm, but didn't want because than I have to make pids for em.

[ls1vt209]

I would look in the fuse box for a pin that is not being used. Use a multimeter/test light to ensure it is ignition and not constant power.

I have done this before with several things, used a fuse and had to date no problems.

[LM7Tuner]

The fuse box under the hood or in the vehicle?

[Gordy M]

You can get a double tap for you fuse box and add a separate fuseable source from you panel. Here is the panel and tap I used from my drivers side. Excuse the crappy phone camera pics.

[LM7Tuner]

Where can I get a double tap?

[Gordy M]

NAPA, Autozone, O'Reillys, etc. have them

[LM7Tuner]

Thanks guys I got it all wired up.

[joecar]

Cool...:cheers:

Post some pics...

Where did you put he ground...?

[LM7Tuner]

I'll be sure to post up some pics tomorrow, I grounded it on a bolt right underneath the dash fuse box that attaches the dash to the metal frame. Then I ran the wires through the dash so its all in the glovebox, so now I just hook up my scanner through there. Gotta give a special thanks to Gordy for the double tap reccomendation, and Joe for telling me not to go to the PCM and saving me a lot of work. :)

[ScarabEpic22]

Im going to steal some recommendations from this thread for my new LC1 + TAQ cable thats in the mail!

Thanks guys

[LM7Tuner]

Here are the pics of it installed in the glovebox, sorry no wiring pics I buttoned it all up before I took any.
http://img41.imageshack.us/img41/6073/dscf1013vw.jpg (http://img41.imageshack.us/i/dscf1013vw.jpg/)

[LM7Tuner]

One last thing, how do I setup my controller with my scanner? I know there is a pid for the PLX wideband, but it wont let me activate it. Does the vehicle have to be running for the wideband pid to activate?

[mr.prick]

You need any pre-requisite PIDs selected first.
EXT.ADx or EXT.WO2AFR

[LM7Tuner]

Ok I selected EXT.AD1 and then CALC.AFR_PLX1 and now they are valid but for allocating to my AFR gauge which one should I choose?
http://img178.imageshack.us/img178/839/44784737.png (http://img178.imageshack.us/i/44784737.png/)

[joecar]

Are you going to use analog AFR or serial AFR...?


In FlashScan V2 setup options, for analog AFR:
- enable AD Pids (for analog AFR),

Or for serial AFR:
- enable Ser Pids (for serial AFR),
- set Comm Port to Wideband,
- set Wideband to PLX,
- set Format to 1st or Both,
- set Data display to AFR and EQ.


Then, either of the following:

For serial AFR, you select these pids in scantool: EXT.WO2AFR1 and CALC.BEN1.

For analog AFR, you select these pids in scantool: GM.AFR, EXT.AD1, CALC_AFR_PLX1, CALC.BEN_PLX1.

[joecar]

ok i selected ext.ad1 and then calc.afr_plx1 and now they are valid but for allocating to my afr gauge which one should i choose?
Oh, you're doing analog AFR...

select CALC.AFR_PLX1 to display on the gauge/chart.

[LM7Tuner]

Thanks I think everything is good to go.