AEM Wideband wiring question.
TECH Fanatic
Joined: Jun 2003
Posts: 1,869
Likes: 99
LSX power tuning said that he tested quite a few serial to USB adapter cables before finding one that worked really well. It's a crapshoot with some of the electronic hardware from China. Since you have so little invested, might try a different cable or have Lorenz ship you his cable.
BTW - were you actually getting voltage readouts on your laptop when you tested with Hyper Terminal?
Not all USB ports are created equal either. They must be powered and they need to supply 5 volts. I've encounter USB ports that won't drive some external hard drives so I had to use a cable with two USB ends to get enough power to drive the external hard drive.
So you might try swapping USB ports if you have more than two USB ports (one for your VCM scanner and another for the wideband).
I would also visit the New Era Performance site. Their documents states HP tuners works with the 30-30x0 series AEM controllers. Perhaps they will provide some insight into the setup they used for serial with HP.
BTW - were you actually getting voltage readouts on your laptop when you tested with Hyper Terminal?
Not all USB ports are created equal either. They must be powered and they need to supply 5 volts. I've encounter USB ports that won't drive some external hard drives so I had to use a cable with two USB ends to get enough power to drive the external hard drive.
So you might try swapping USB ports if you have more than two USB ports (one for your VCM scanner and another for the wideband).
I would also visit the New Era Performance site. Their documents states HP tuners works with the 30-30x0 series AEM controllers. Perhaps they will provide some insight into the setup they used for serial with HP.
Teching In
Joined: Feb 2006
Posts: 39
Likes: 0
From: Glendale, CA
I fought with an AEM UEGO wideband controller much like you did and finally just gave up and used an analog input for the EGR on one car and later the AC pressure PID on my own car. Both work perfectly. Maybe there is an issue with AEM's setup?
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 376
Likes: 3
From: Gary, In
How hard was it to setup the software to use EGR/AC? I'd assume if I was to use EGR I wouldn't need a toggle switch to go back and forth between logging/using AC since I'm no longer using EGR?
Teching In
Joined: Feb 2006
Posts: 39
Likes: 0
From: Glendale, CA
I created a second math parameter that gives a percentage above or below the commanded AFR from the computer. It's basically [(wideband AFR - commanded AFR)/commanded AFR]*100. Negative numbers mean you remove fuel, while positive numbers mean you add fuel.
For example, assume a commanded AFR of 12.5 and measured AFR of 11.5, the result is [(11.5 - 12.5)/12.5]*100 = -8%. The number is telling you that the car is running 8% too rich, and you need to reduce fueling by 8%.
Likewise, assume a commanded AFR of 12.5 and measured AFR of 14.5, the result is [(14.5 - 12.5)/12.5]*100 = 16%. The number is telling you that the car is running 16% too lean, and you need to increase fueling by 16%.
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Verdad Gallardo TECH Fanatic
Joined: Jun 2003
Posts: 1,869
Likes: 99
I used this USB-Serial Adapter with my AEM Wide Band. It works just fine.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Which AEM model series?
Scanning serial or analog?
What model year - pre -2007 or post 2007 using Can bus?
Staging Lane
Joined: Jul 2018
Posts: 76
Likes: 4
Which version of HP Tuners? MPVI2
Which AEM model series?
Scanning serial or analog? Serial, or you wouldn't need the adapter, right? Unless I'm missing something....
What model year - pre -2007 or post 2007 using Can bus? Whatever I want to use it on. Not reliant on the OBD2 plug with a serial connection. To answer your question, 2003, 2008, 2010, 2012 Silverados.
Which AEM model series?
Scanning serial or analog? Serial, or you wouldn't need the adapter, right? Unless I'm missing something....
What model year - pre -2007 or post 2007 using Can bus? Whatever I want to use it on. Not reliant on the OBD2 plug with a serial connection. To answer your question, 2003, 2008, 2010, 2012 Silverados.
TECH Fanatic
Joined: Jun 2003
Posts: 1,869
Likes: 99
Which version of HP Tuners? MPVI2
Which AEM model series? https://www.amazon.com/gp/product/B0184TSI84/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Scanning serial or analog? Serial, or you wouldn't need the adapter, right? Unless I'm missing something....
What model year - pre -2007 or post 2007 using Can bus? Whatever I want to use it on. Not reliant on the OBD2 plug with a serial connection. To answer your question, 2003, 2008, 2010, 2012 Silverados.
Which AEM model series? https://www.amazon.com/gp/product/B0184TSI84/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Scanning serial or analog? Serial, or you wouldn't need the adapter, right? Unless I'm missing something....
What model year - pre -2007 or post 2007 using Can bus? Whatever I want to use it on. Not reliant on the OBD2 plug with a serial connection. To answer your question, 2003, 2008, 2010, 2012 Silverados.
For vehicles that are 08 and newer AEM 30-030x0 series can also send the data stream thru the OBDII port - and about 10X faster. It's all explained in the ERM attachment in the link.
So, all said, it looks as if you and the OP both have HP MVPI2 and the same AEM wideband series (03-0300).
So what the OP needs, if you will share, is what steps you took when you initially set up your wide band to MVPI2 so he can read AFR or lambda. Others on the HP forum have the same issue with the AEM 30-0300 series in that the data stream AFR value won't display in the PID field, but not so with the AEM 30-4000,4100, and 4110 series.
IMO, it's perhaps the offset values that he is using to compared to what you are using. The devil is in the details.
Thanks in advance.
To OP. It might be a good idea to uninstall the MVPI2 software and reinstall. Might be a file that is corrupted. Check your Microsoft Net Framework version.
- 2 GHz CPU
- 4 GB RAM
- Microsoft Windows® 7 or better
- Microsoft .NET Framework 4.6.1 or higher
- USB Port
Last edited by dlandsvZ28; Mar 12, 2019 at 01:43 PM. Reason: edit content
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 376
Likes: 3
From: Gary, In
I waived the white flag with getting the serial to work and have gone analog but, still need a couple pointers. First is I know I can use wither AC or EGR but if I use AC I'd have to use a toggle switch to be able to log and use my AC so I was thinking EGR since it's already gone and I could skip the toggle switch part and make it permanent, Is my thinking correct? Also I had it working with EGR but I seem to be having problems with the math parameters. I had it matching my AFR when it was cold but when it warmed up the numbers were off.....by like 3-4 percent? Is there any predetermined numbers I can go with and then fine tune from there to get it spot-on?
Oh, also since I'm running speed density, I can't use the command AFR right?
Oh, also since I'm running speed density, I can't use the command AFR right?
TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
Sorry was OTL this week, but yea once you see what AEM is providing on the connector,, its well,, stupid..
Serial by the IEEE standard NEEDs minimum of 3 wires,,
it will work with 2 "sometimes"(pins 2&3) If you're lucky..
with one wire + ground its possible get a read only data but wtf..
What EM is doing is providing a transmit pin, and a ground, which will let data stream out,, but there is
no return signal so no handshaking, in this scenario its a total crap shoot what will work with a given serial port.
The truly sucky part, is that there is no such thing as a UART that doesn't provide a TX and RX pin, so
they simply chose to do it half assed.. Or custom programmed their chip and somehow are programing
a spare pin as a simple output signal.
The engineer that did this needs hung with a serial cable over a tank of sharks.. And lowered slowly..
I go go off on a AEM rant but life I too short..
Serial by the IEEE standard NEEDs minimum of 3 wires,,
it will work with 2 "sometimes"(pins 2&3) If you're lucky..
with one wire + ground its possible get a read only data but wtf..
What EM is doing is providing a transmit pin, and a ground, which will let data stream out,, but there is
no return signal so no handshaking, in this scenario its a total crap shoot what will work with a given serial port.
The truly sucky part, is that there is no such thing as a UART that doesn't provide a TX and RX pin, so
they simply chose to do it half assed.. Or custom programmed their chip and somehow are programing
a spare pin as a simple output signal.
The engineer that did this needs hung with a serial cable over a tank of sharks.. And lowered slowly..
I go go off on a AEM rant but life I too short..
Teching In
Joined: Feb 2019
Posts: 49
Likes: 1
From: Wyoming
I waived the white flag with getting the serial to work and have gone analog but, still need a couple pointers. First is I know I can use wither AC or EGR but if I use AC I'd have to use a toggle switch to be able to log and use my AC so I was thinking EGR since it's already gone and I could skip the toggle switch part and make it permanent, Is my thinking correct? Also I had it working with EGR but I seem to be having problems with the math parameters. I had it matching my AFR when it was cold but when it warmed up the numbers were off.....by like 3-4 percent? Is there any predetermined numbers I can go with and then fine tune from there to get it spot-on?
Oh, also since I'm running speed density, I can't use the command AFR right?
Oh, also since I'm running speed density, I can't use the command AFR right?