Hello, I'm new here so I apologize if I miss anything. I have a EG Hatchback with a GSR swap on Hondata s300. It has always ran perfect up until I installed an AEM Wideband. I have the Wideband pinned into D10 in the ECU and the sensor in my Skunk2 Alpha header. The main problem I have is the AFR is all over the place. When driving until throttle it's fine. But as soon as I start cruising it jumps all the way from 12 to 20 and starts breaking up until I give it throttle again. It does this until the CEL comes on for Engine Overtemp Condition then it runs perfect. Any help is appreciated!

 

Are you running in open or closed loop?

Make sure the lambda conversion table is correct for using the AEM wide band, read through this link and make sure you cut the resistors in the ECU as well as use the thermostat ground for the wide band ground.

http://www.phearable.net/information...etupguide.html

 

You're SUPPOSED to wire it to D14, not D10. That may be your issue right there.

 

Actually its better to use D10! If you searched the Hondata forums you would see why. D14 does not have the full range of voltage needed for a 0-5 volt input. so use D10.

 

Found an article describing the issue on HAMotorsports' website.
However, this is what they later mentioned.........….
"UPDATE: With all newer wideband systems that use the Bosch LSU 4.9 sensor, 0-3.73 volts reading through the stock D14 O2 sensor input is more than sufficient for reading air/fuel ratio, so using the D10 ELD input is no longer beneficial. If your wideband uses the Bosch LSU 4.9 sensor, we recommend using the D14 input now, this way you can leave the ELD circuit functional."

 

Well there you go!