Hi, I'm trying to install a aem wideband without the gauge to the stock o2 sensor socket for a b16 running on a p28 with cobrartp. I intend to use the d14 pin like stock, I wouldn't get the full five volts but from what I've heard it can read up to 3 volts. I think its enuff to tune a normal aspirated engine since I don't need to go all that rich.
My problem is which wire is what, I've been looking for some pinouts but the majority I find has different colors and gets confusing.
The idea is to just use the heater wires, the 5 volts signal to the d14 pin on ecu and the signal ground wire.
Could someone experienced give some advice on how I could solder the stock denso wire socket on the wideband to make this possible?
Thanks in advance.


Left, aem 4.2 lsu 5 wires. Right stock denso o2 4 wires

 

Umm wait. What? No.

That's not how any of that works. You can't just wire a wideband lambda sensor in to a narrowband system and call it a day. These are two very different sensors. If you could do that, we'd never have had to create wideband sensor kits/controllers in the first place.

You have to use a wideband/lambda controller. It handles controlling the heater and interpreting the output of the LSU sensor into lambda and then converts that lambda value into a 0-5V signal to output to an ecu. Some also have a simulated narrowband output. In the case of your AEM, the controller is a single unit with the gauge.

If you want a controller without a gauge, you want a PLX SM-AFR.

Here is your ecu pinout: https://technet.ff-squad.com/wiring.obd1.htm

D12 is a better option for adding in a wideband than either D10 or D14. It already reads the full 0-5V range and I can almost guarantee you're not using it already.

 

Update:
I just did some testing using a 12v charger but low amps, the o2 sensors heated because I couldn't touch them, but not enuff to read above 100 milivolts. But I could see the change in volts if I blow into the sensor.
I'm pretty sure the denso o2 the black wires are the heater and the signal is the white wire and the signal ground is the green one.
The aem 4.2 I didn't get any conclusive results, but figure it out that the white and gray wires are the heater, the yellow wire the signal bit I'm not sure. About the black and red I don't have a clue.

 

Yep. That's the correct function for the narrowband sensor. They are very simple devices. 5 wire lambda sensors, not so much.

You need to read here: https://wbo2.com/lsu/lsuworks.htm

 

Hi thx for your help, I remember seeing someone on a forum using a wideband on d14 for datalogging, my idea was to do exactly the same. I remember that he told that he couldn't get more than 3 volts on that ecu pin but was enuff to read 12.5 to 1 AFR for an allmotor tune.
My idea is to do exactly the same. If I can't do it I'll have to look for d12 pin, I know that. My problem now is understanding the wires on the aem widband. Cannot find any clear schematics for that.
Edit:
On Honda Tuning Suite we can set the ecu port that we want and the voltage for the O2 sensor. I just wanted to try that, but first I need to figure it out witch wire is what.

 

I have a hard time believing you really can't find a pinout for an AEM wideband unit. What model do you have? The wiring guide can be found in like, every car forum ever, on AEM's website in the instructions for the unit, in the box with your unit if you purchased it new, in the Hondata help, on and on. Here's literally the first result in Google images if I search for 'AEM Wideband wiring':





There are typically four analog inputs on an OBD1 ecu that can be purposed for a lambda sensor.

- D10 is ELD. Some markets didn't have an ELD, so I don't know if the hardware is available on the board to use this in those market ecus. This will accept the full 0-5V range. Needs a couple of resistors removed from the board.
- D12 is for EGR Valve Lift Sensor. Your ecu likely doesn't use EGR unless it's for a D15Z1. It reads the full 0-5V range. Needs a capacitor installed to read correctly.
- D14 is for the stock narrowband sensor. Will not read the full 0-5V range unless the ecu is modified to do so.
- B6 is not used for anything. It will read the full 0-5V range. Not all tuners allow its use as a lambda input, but it's there.

None of these can be used with a lambda sensor wired directly to the input. You must use a wideband controller. If you think you have found something on the internet stating otherwise, it indisputably is misinformation.

@TheShodan, this thread belongs in the engine management forum

 

I found that image several times. But since I was trying to connect the wideband directly to the ecu and without the gauge I ignore it. I already found several datasheets on the lsu 4.2 but they are very vague.
I understand that the black wire is VS, the yellow is VS/IP and the red one is IP, this meaning there is CAN BUS envolved.
So there is no way of connecting directly to the ecu, that's a bummer. I'm gonna have to spend more money on a wideband controller.

 

If you just don’t want a gauge on your dash, you can install it in your glovebox or something. Otherwise yeah, you’ll need to buy something else. The only other option would be to upgrade to an eco that has a lambda controller onboard.

PLX is great and reliable. I have mine attached to straight to the ecu with a strip of dual lock Velcro. Gauge is completely optional.

 

Hi, thx a lot for all of your help. I learn a lot from all of you.
I'm looking for a wideband controller of this type, because aem is to expensive and I live in a poor country.
https://www.kperformance.be/Tiny-O2-Controller