PLX DM-5/SM-AFR interfacing with the ecm

[Ian Turgeon]

Finally got around to installing my dm-5 afr /sm-afr combo last weekend, which has me moving on to the next step, integrating the wideband into the ecm so I can get going with this tuning thing.

I need to verify wiring with ye experienced folk.

From my research, I need to connect the "WB" on the 4 wire connector to GF14 at the ecm and the "GND" on the 4 wire connector to BB9 at the ecm

sm-afr docs: http://www.plxdevices.com/InstallationInstructions/SM-AFRUsersGuide.pdf
dm-5 docs: http://www.plxdevices.com/InstallationInstructions/DM-5AFRUsersGuide.pdf

Additional Questions:
Any idea if I can log to the ecm and connect the dm-5 afr at the same time?
Can I wire this up without having a patched bin (ie no data, but truck runs fine still)

edit....
... and a diagram I made from all the feedback from this thread:

 

[ashman]

Re: PLX DM-5/SM-AFR interfacing with the ecm

looks like you've got it nailed, as far as connections go.

it also, looks like you'll have to try connecting to the dm-5 and ecm at the same time.

yes, you can wire it up without a patched bin. it should run fine. you just won't see any data.

my question. are the outputs of the smr programmable? is the NB output capable of being programmed for WB output also?

 

[turbodig]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Finally got around to installing my dm-5 afr /sm-afr combo last weekend, which has me moving on to the next step, integrating the wideband into the ecm so I can get going with this tuning thing.

I need to verify wiring with ye experienced folk.

From my research, I need to connect the "WB" on the 4 wire connector to GF14 at the ecm and the "GND" on the 4 wire connector to BB9 at the ecm

sm-afr docs: http://www.plxdevices.com/InstallationInstructions/SM-AFRUsersGuide.pdf
dm-5 docs: http://www.plxdevices.com/InstallationInstructions/DM-5AFRUsersGuide.pdf

Correct. I'd also recommend the noise filtering cap that they mention in the manual.

Additional Questions:
Any idea if I can log to the ecm and connect the dm-5 afr at the same time?
Can I wire this up without having a patched bin (ie no data, but truck runs fine still)

Yes.

and

Yes.

 

[Ian Turgeon]

Re: PLX DM-5/SM-AFR interfacing with the ecm

my question. are the outputs of the smr programmable? is the NB output capable of being programmed for WB output also?

As far as I know... no, theres no mention of it besides the fact that theres no way change any settings on the box. (ie no buttons or interface)

 

[Ian Turgeon]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Correct. I'd also recommend the noise filtering cap that they mention in the manual.




Yes.

and

Yes.

Cool, I was wondering about that, and it was likely to be my next question, Do I just need to connect that between the two wires I'm adding to the ecm?

I also have to thank dig for installing his weatherpak connector back when he was in town tuning, makes my life a little easier (I just have to find a mating weatherpac that will fit)

 

[turbodig]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Cool, I was wondering about that, and it was likely to be my next question, Do I just need to connect that between the two wires I'm adding to the ecm?

I also have to thank dig for installing his weatherpak connector back when he was in town tuning, makes my life a little easier (I just have to find a mating weatherpac that will fit)

Yep, put 'em as close to the ECM side as practical. Backside of the connector would be ok.
There's a little tool you can get to take the weatherpack pins out... it's like $6-7.

Weatherpack is easy... dang near any autozone type place will have one.

I get all my weatherpack stuff from waytekwire.com... considerably cheaper.

 

[WyoSyclone]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Strange...
I'm going throught the same thing today that Ian (SyTyArchives) went through earlier on this thread...

I have everything done except for connecting the two wires from the SM-AFR to the ECM. I assumed I would be teeing into existing wires in the B9 and F14 slots. Those slots in my ECM are blank... is this how it should be? I'll have to find a couple of weatherpak terminals somewhere if so.

I read on another thread where one cap is installed between b9 and f14, but on that thread they installed the second between b9 and e14 (factory NB). Does this need to be done, or just install the one on the WB wire.

the strange thing.... on every picture I can find of ECM's on the site, everyone has a bright yellow housing plugged into the ECM (where the f14 slot is). My housing is green and is labeled A1 thru A16, and B1 thru B16.... is this a replacement weatherpak housing, or is something else going on??

Thanks for the help!

...Rob

 

[WyoSyclone]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Well, I managed to get back home where my Sy manuals are.

It says my ECM housing is supposed to be light green.... I don't know why all of your pics show a yellow housing. :?

Factory schematics show B9 on 24 pin, and F14 on light green connector blank (not used).

If I can't find factory Weatherpak terminals to go into B9 and F14, can I tap into E14 (factory O2 signal), and E15 (factory O2 ground)?

 

[SonomaGTlover]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Does anybodyhave a pic of the weatherpaks?
I picked up what I thought was correct but I was wrong.
I am hooking up the same PLX SM-AFR wb

 

[WyoSyclone]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Hey Sonoma,
I'll be looking for these today, and will post a pic if I can find them (I won't be back on the forum till tomorrow morning).
Page 6E-9 of my factory Sy book says the ECM uses "Metri-Pack Series 150 Terminals". They also list a factory tool for removing them (BT-8446), but we won't need that as we're just inserting new wires/terminals.

Book also says that GM dealers have a 'terminal repair kit' (J38125-A) - looks like a big fishing box full of terminals and tools.... surely they would have terminals in that kit, that we could buy.

Hope this helps.

 

[SonomaGTlover]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Yes, it will help a great deal. I'm heading out again Monday to find what I need.

 

[bizkit]

Re: PLX DM-5/SM-AFR interfacing with the ecm

On mine I stole the terminals out of the weatherpacks that are supposed to run the egr valve and the intercooler pump. I can look up the pin #'s for those if you need. I have egr delete and run my intercooler pump with my electric water pump.

 

[SonomaGTlover]

Re: PLX DM-5/SM-AFR interfacing with the ecm

On mine I stole the terminals out of the weatherpacks that are supposed to run the egr valve and the intercooler pump. I can look up the pin #'s for those if you need. I have egr delete and run my intercooler pump with my electric water pump.

Sounds like an idea... I have EGR delete as well so I could just use that one.
Snip the EGR wire, remove from plug and insert into F14?
Then connect the WB output to the pigtail of old EGR wire that is now in F14.
CORRECT??
Now to go looking for the patch to monitor it in TunerProRT (I don't have the "Actual AFR" option unless it mysteriously shows up once connected)

 

[WyoSyclone]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Hey Guys,
Well, I didn't want to take a connector out of another harness in the Sy to use at the ECM for my wideband connections, so I tracked the terminals down at the local GMC dealer. Here's a pic....

These are the terminals that install into the connector housings that plug into the ECM. The GM part number has gone through a change - the old number was 12089649, and the new number is 121466448. The GM parts department can't order these for you, but they are available in the connector repair kit that the service department uses. If you're nice to the parts guys, they'll just give you some.

Also, I did find that NAPA does sell these - you just have to buy a box of 50 of them. The NAPA part number is 725180, and they're found in the Belden catalog.

Hope this helps!

 

[Big Mike]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Good stuff!!!

 

[WyoSyclone]

Re: PLX DM-5/SM-AFR interfacing with the ecm

So.... I got the PLX SM-AFR hooked into the ECM tonight and learned a few things along the way.... hope this helps you other guys who haven't started this yet.

In the PLX instructions it says to mount the noise suppression capacitor as close to the ECM as possible. So, in my normal fashion I took that literally and did this...


Notice how nicely the capacitor legs are insulated and it's all soldered directly to the terminal??

Well, that didn't quite work cuz' the darn capacitor legs aren't long enough to get the connectors plugged back into the ECM :rant: ...just call me dummy!

So, I took it apart and did this....


The capacitor is installed about 2 inches from the ECM. The capacitor is just above the word "ECM" in this pic.

Remember, those capacitors have voltage on the legs, so you have to insulate them! I used some really small shrink tubing and covered them up like this first...

I like to use a lot of heat shrink and keep a lot of different sizes handy. The capacitor is inside of that large blue heat shrink.

In the end it ended up looking like this. There is no stress on the wires as they're wire tied to the other wires, the capacitor is safely tucked away inside double layers of heat shrink and then sits inside the convoluted tubing, and then the tubing is wire tied to make sure stress can't cause a problem. This should be a reliable installation.

Oh, and if you ever have to remove a "Metri-Pak" terminal from the housing, first remove the snap-on plastic terminal lock from the rear of the connector, and then push a paper clip into the larger hole on the front of the connector housing (while pushing the terminal and wire into the connector from the rear). You will feel the paper clip meet a slight resistance, and then the terminal will slide out the rear! ...no expensive tool needed on this particular terminal...

 

[SonomaGTlover]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Awesome information and pics :tup:

Local AutoZone didn't have the terminals and neither did Rally's so it looks like I may head out to NAPA for the box of 50 cause the Parts guy locally wasn't too thrilled with me when I wanted to get a boost solenoid connector. Took 20+ min. just to find Syclone listed in the PC and then it didn't give any part number, just a very hard to see pic. I left without one and cut the front ABS connector off of the pass wheel. Worked like a charm.

Anyway, I'll post if I get the box of 50 and anyone here is welcome to have 2 of them for free, but I may take a chance at the GM dealer first. Stay tuned.....

 

[SonomaGTlover]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Well, things didn't work out too well but I got the 3 terminals that I needed. (WB and bad speedo)
I sweet talked the service manager as well as I could but he ended up charging me $3 ea. for them. I thought about heading out to NAPA to get the box of 50 but I figured it'd probably be about $50 and I sure don't need that many so I bit the bullet and paid the $9 + they even threw sales tax on there so just short of $10 to plug in the WB. When I first joined this board I was warned to have deep pockets if I moved up from the GT to a SY... that was some good advice.

 

[Loeryder]

Re: PLX DM-5/SM-AFR interfacing with the ecm

Where are you guys tapping to get the power for the WB?

It needs to be key switched +12V.
I need to put a key switched "power strip" in my glovebox with all the crap I have hooked up.
WB, Alky, elec fans, Profec-B, the list just keeps goin.

 

[epix]

Re: PLX DM-5/SM-AFR interfacing with the ecm

bit off topic, but I pulled out my ECM a couple months back and forgot how to put it back in, what is the correct position to fit it back into the dash?