PLX DM-5/SM-AFR interfacing with the ecm
- Thread starter Ian Turgeon
- Start date
boosteds10
Finally Fixed
Re: PLX DM-5/SM-AFR interfacing with the ecm
Anyone? Lookin to see which ground get the capacitors and put into the ecu. Ive been lookin at all the how to's and I cant find it
Anyone? Lookin to see which ground get the capacitors and put into the ecu. Ive been lookin at all the how to's and I cant find it
the baPhoon
Active member
Re: PLX DM-5/SM-AFR interfacing with the ecm
BB9 is the ECM ground.
BB9 is the ECM ground.
boosteds10
Finally Fixed
Re: PLX DM-5/SM-AFR interfacing with the ecm
Ah alright cool its the ecm ground. thanks man, IDK why but I thought it may be the sensors ground. awsome, gonna be hooked up tomorrow then
Ah alright cool its the ecm ground. thanks man, IDK why but I thought it may be the sensors ground. awsome, gonna be hooked up tomorrow then
WyoSyclone
Active member
Re: PLX DM-5/SM-AFR interfacing with the ecm
Jeff (TwinTurboV8Ty) just posted on another thread this source for the GM ECM connectors (and others! - great link Jeff!)
http://www.eficonnection.com/eficonnection/100.aspx
Awesome souce for some hard-to-find parts :tup:
Jeff (TwinTurboV8Ty) just posted on another thread this source for the GM ECM connectors (and others! - great link Jeff!)
http://www.eficonnection.com/eficonnection/100.aspx
Awesome souce for some hard-to-find parts :tup:
Sy Guy 0024
Member
Re: PLX DM-5/SM-AFR interfacing with the ecm
May be a dumb question, but in regards to using the B9 ECM ground- does the ECM itself need to be grounded through the mounting bracket? In other words, would the B9 ground still work if the ECM was moved to the glove box? Or would that require moving the ground?
May be a dumb question, but in regards to using the B9 ECM ground- does the ECM itself need to be grounded through the mounting bracket? In other words, would the B9 ground still work if the ECM was moved to the glove box? Or would that require moving the ground?
Sy Guy 0024
Member
Re: PLX DM-5/SM-AFR interfacing with the ecm
Yeah, I've got the ecm in my sy in the glovebox, but I believe I ran that wb ground to another location for whatever reason. I grounded to B9 in the Ty, but the wires don't seem long enough to reach the glovebox, so it's back in the stock location for now.
Yeah, I've got the ecm in my sy in the glovebox, but I believe I ran that wb ground to another location for whatever reason. I grounded to B9 in the Ty, but the wires don't seem long enough to reach the glovebox, so it's back in the stock location for now.
MikeMcNair
New member
Re: PLX DM-5/SM-AFR interfacing with the ecm
so, let me get this correct:
by installing the wideband output and ground output intho the ECM pins, it will allow the ECM to read the O2? i would think the narrow band signal would be the one to tie into the factory setup.
can someone explain how the wideband output will work with a car that was designed to ne narrow band? i am doing this tomorrow.
so, let me get this correct:
by installing the wideband output and ground output intho the ECM pins, it will allow the ECM to read the O2? i would think the narrow band signal would be the one to tie into the factory setup.
can someone explain how the wideband output will work with a car that was designed to ne narrow band? i am doing this tomorrow.
ghettosled
SYTY SUPERSTORE
Re: PLX DM-5/SM-AFR interfacing with the ecm
the car will not run off the wideband.. the wide band shows up in the target air fuel table in datamaster or tunerpro scan tools. You can use it for logging purposes only. if your chip still has closed loop correction you will need a narrow band 0-1 volt sensor or something that will simulate that voltage (i think the plx will)
the car will not run off the wideband.. the wide band shows up in the target air fuel table in datamaster or tunerpro scan tools. You can use it for logging purposes only. if your chip still has closed loop correction you will need a narrow band 0-1 volt sensor or something that will simulate that voltage (i think the plx will)
the baPhoon
Active member
Re: PLX DM-5/SM-AFR interfacing with the ecm
Yeah, the PLX does have narrowband emulation.
As Ghetto said, You will be seeing your AFR as a wideband reading, but your stock ECM will still be seeing the info as narrowband. From what i remember you need a chip or stock burned chip upgraded with software for your ECM to utilize the WBO2 data.
Yeah, the PLX does have narrowband emulation.
As Ghetto said, You will be seeing your AFR as a wideband reading, but your stock ECM will still be seeing the info as narrowband. From what i remember you need a chip or stock burned chip upgraded with software for your ECM to utilize the WBO2 data.
JSM
Active member
Re: PLX DM-5/SM-AFR interfacing with the ecm
2 words of caution:
Stock bins won't even log the data. You must have the WB "fix/hack" to the chip.
Or run code59, which has the fix built in, in addition it can run the WB directly, closed loop included.
2 words of caution:
Stock bins won't even log the data. You must have the WB "fix/hack" to the chip.
Or run code59, which has the fix built in, in addition it can run the WB directly, closed loop included.
MikeMcNair
New member
Re: PLX DM-5/SM-AFR interfacing with the ecm
i am still not catching this, so please clarify....
i have the PLX wideband installed. i need the ECU to see O2 information, so i take the NARROWBAND analog output, and tap it into the ECU. then i take the GROUND analog output and put it to the ground on the ECU.
i tried doing it just like this........................
and got no where. what am i doing wrong?
can't i just tap into the signal wire on the O2 harness, and the ground on the same plug. (the one actually in the engine bay.
so, i would take my PLX NARROWBAND output to the wire in the engine bay coming from the factory O2. etc
while seemingly more work, it makes more sense to me.
i am still not catching this, so please clarify....
i have the PLX wideband installed. i need the ECU to see O2 information, so i take the NARROWBAND analog output, and tap it into the ECU. then i take the GROUND analog output and put it to the ground on the ECU.
i tried doing it just like this........................
and got no where. what am i doing wrong?
can't i just tap into the signal wire on the O2 harness, and the ground on the same plug. (the one actually in the engine bay.
so, i would take my PLX NARROWBAND output to the wire in the engine bay coming from the factory O2. etc
while seemingly more work, it makes more sense to me.
turbodig
Active member
Re: PLX DM-5/SM-AFR interfacing with the ecm
There's a couple things going on...probably the reason for the confusion.
In stock form (and most of the aftermarket chips as well) the AFR field doesn't reflect real AFR. It's a calculated number.
The people that are getting real AFR data in the data stream, either have a "patched" chip (see http://digware.lunarpages.com) or are running code59. (code59.org) Both have additional ECM code to read an additional input, and translate this input to an AFR value. This is what's getting routed to Pin F14.
The PLX (and others) will also let you simulate a narrowband output. This is what you would run into the stock o2 input. This won't give you an AFR reading. It will cause the o2 mv value to have a semi-consistent value, and based on how you programmed the "simulated" narrowband, you could make a chart such that .xxx mv = xx.x AFR.
Some people do both - they route the simulated narrowband to the stock o2 line, and run the F14 line to read real wideband data. This allows them to remove the stock o2 sensor, have the wideband "simulate" it, and the ECM doesn't know it's gone.
Code59 sorta eliminates the need for this, since it has code to actually use the wideband for closed loop fuel control. (Although, it's still open-loop at WOT like every other GM ECM)
Hopefully, that clears some things up. Bottom line, you really have to have a patched chip or code59 to get any useful data in the ALDL stream. (In a practical fashion).
There's a couple things going on...probably the reason for the confusion.
In stock form (and most of the aftermarket chips as well) the AFR field doesn't reflect real AFR. It's a calculated number.
The people that are getting real AFR data in the data stream, either have a "patched" chip (see http://digware.lunarpages.com) or are running code59. (code59.org) Both have additional ECM code to read an additional input, and translate this input to an AFR value. This is what's getting routed to Pin F14.
The PLX (and others) will also let you simulate a narrowband output. This is what you would run into the stock o2 input. This won't give you an AFR reading. It will cause the o2 mv value to have a semi-consistent value, and based on how you programmed the "simulated" narrowband, you could make a chart such that .xxx mv = xx.x AFR.
Some people do both - they route the simulated narrowband to the stock o2 line, and run the F14 line to read real wideband data. This allows them to remove the stock o2 sensor, have the wideband "simulate" it, and the ECM doesn't know it's gone.
Code59 sorta eliminates the need for this, since it has code to actually use the wideband for closed loop fuel control. (Although, it's still open-loop at WOT like every other GM ECM)
Hopefully, that clears some things up. Bottom line, you really have to have a patched chip or code59 to get any useful data in the ALDL stream. (In a practical fashion).
MikeMcNair
New member
Re: PLX DM-5/SM-AFR interfacing with the ecm
you are the man!!!!!!!!!!!!
ok, so if i want my truck to think it is stock, i am on the right path? i dont care about the datamaster values, i just want the stock ECM to control fuell like it should.
does that make sense?
also, this code 59 thing: i have read all the threads, and i don't see two things:
1)how do i get it IN the truck
2)how do i use it
all the links, go to forums, or questions, i need a solid DIY for it (unless i can have my stock ECM read the narrow-output and react like stock, cause that's what i really want for now)
i want to get this thing running right STOCK first, THEN get into all that stuff. and these domestic cars are WAY different them my german crap i deal with daily.
you are the man!!!!!!!!!!!!
ok, so if i want my truck to think it is stock, i am on the right path? i dont care about the datamaster values, i just want the stock ECM to control fuell like it should.
does that make sense?
also, this code 59 thing: i have read all the threads, and i don't see two things:
1)how do i get it IN the truck
2)how do i use it
all the links, go to forums, or questions, i need a solid DIY for it (unless i can have my stock ECM read the narrow-output and react like stock, cause that's what i really want for now)
i want to get this thing running right STOCK first, THEN get into all that stuff. and these domestic cars are WAY different them my german crap i deal with daily.
turbodig
Active member
Re: PLX DM-5/SM-AFR interfacing with the ecm
Yup. The thing about "simulating" anything, is that it isn't *exactly* like the real thing.
The for-sure way? Add a second bung in the DP for the wideband. Run the stock o2 and the wideband.
Run the wideband to the gauge only, and the ECM runs itself.
I run mine with both sensors. I know there are quite a few guys running the "simulated" input, and there's nothing wrong with that, but at the end of the day there's no substitute for the real thing.
You'll have to burn a chip for it, or buy an emulator (ostrich,romulator, etc) and program to it.
This essentially replaces your stock chip.
Search is your friend. There's tons of articles on it here, and code59.org.
... and that's a really good plan. Too many people jump right into a bunch of mods, and are shaking hands with the shiny parts inside in short order. Slow is good, in terms of planning and implementing mods.
Yup. The thing about "simulating" anything, is that it isn't *exactly* like the real thing.
The for-sure way? Add a second bung in the DP for the wideband. Run the stock o2 and the wideband.
Run the wideband to the gauge only, and the ECM runs itself.
I run mine with both sensors. I know there are quite a few guys running the "simulated" input, and there's nothing wrong with that, but at the end of the day there's no substitute for the real thing.
You'll have to burn a chip for it, or buy an emulator (ostrich,romulator, etc) and program to it.
This essentially replaces your stock chip.
Search is your friend. There's tons of articles on it here, and code59.org.
... and that's a really good plan. Too many people jump right into a bunch of mods, and are shaking hands with the shiny parts inside in short order. Slow is good, in terms of planning and implementing mods.
Tooky
Serious about performance
Re: PLX DM-5/SM-AFR interfacing with the ecm
There's also this incredible "knock-your-socks-off" PLX/WB/ECM Howto Guide that WyoSyclone wrote.. Its a great link that seems to have been forgotten about. I have it linked on my PowerTunePlus Tuner's Guide at least.
There's also this incredible "knock-your-socks-off" PLX/WB/ECM Howto Guide that WyoSyclone wrote.. Its a great link that seems to have been forgotten about. I have it linked on my PowerTunePlus Tuner's Guide at least.
Don W.
Stab it and steer it
Re: PLX DM-5/SM-AFR interfacing with the ecm
To follow up on Dig's post, since my truck is apart anyway, I'll be adding a second bung and running both o2's when it goes back together. Main reason is to place the WB further down the DP as stated in their instructions. Don't know if it will make any difference but I'll feel better. :roll:
To follow up on Dig's post, since my truck is apart anyway, I'll be adding a second bung and running both o2's when it goes back together. Main reason is to place the WB further down the DP as stated in their instructions. Don't know if it will make any difference but I'll feel better. :roll:
MikeMcNair
New member
Re: PLX DM-5/SM-AFR interfacing with the ecm
thanks for the fast replies guys!!!
that write up is what i used, to no avail, so i assume that write up should have a "you need code $59/etc" disclaimer.
also, there is no mention of which analog ports on the controller are used. it simply says "black and gray" wire. that is unclear to me.
so, here is what i am doing, wiring the narrow band output from the PLX SM-AFR controller to the signal plug on the factory O2 harness, and same with the analog ground.
if this doesn't work, i will have to weld a bung on, but i am avoiding that for now, as time is an issue, and i am still in the learning stages of welding
thanks again for all of the help guys, glad to be a part of this forum!!!
thanks for the fast replies guys!!!
that write up is what i used, to no avail, so i assume that write up should have a "you need code $59/etc" disclaimer.
also, there is no mention of which analog ports on the controller are used. it simply says "black and gray" wire. that is unclear to me.
so, here is what i am doing, wiring the narrow band output from the PLX SM-AFR controller to the signal plug on the factory O2 harness, and same with the analog ground.
if this doesn't work, i will have to weld a bung on, but i am avoiding that for now, as time is an issue, and i am still in the learning stages of welding
thanks again for all of the help guys, glad to be a part of this forum!!!
Ian Turgeon
Cascading Inspiration
Re: PLX DM-5/SM-AFR interfacing with the ecm
I thought I'd add this diagram to kind of combine everyone's input into one image:
I thought I'd add this diagram to kind of combine everyone's input into one image:
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