I am having an issue with syncing my AEM wideband readings with S300. I am using ELD D10 for the input on the ECU. I go through the procedure of offsetting my voltage and it was -0.3 offset when I have the wideband unhooked from the gauge (gauge shows 14.8 when unhooked). Both hondata and the gauge are showing 14.8x at this point like it should. When I hook the sensor back up to the back of the gauge hondata is showing a leaner value, a difference of ~1.00. In other words, if AEM is showing 14.8 my laptop is reading ~15.8. I opened my ECU and noticed that I have R136 but no R138 (R138 was never installed from honda). I cut R136 and the voltage offset is less (-0.1) which is good but I can't figure out why I have a difference when I hook the sensor back up. I am grounded at thermostat as hondata instructions recommend. And my power source is from the an open source at the fuse box under the dash that turns on with the key in the power on position.
Could this be a bad ground problem at the thermostat? Thanks in advance for any help and suggestions.
-Ryan
AEM A/F UEGO and Hondata S300 question
Re: AEM A/F UEGO and Hondata S300 question
The voltage offset is there for just this kind of thing. As long as you have them matched then it is ok.
Re: AEM A/F UEGO and Hondata S300 question
So I should be changing the offset with the car is running b/c that's when the reading changes. It seems like it should read the same with or without the car running. That's what I'm confused about.
When the gauge is unhooked from the o2 sensor, it reads 14.8 solid on the gauge so I can sync it with hondata using the voltage offset. I then work the offset value until I get hondata reading 14.8. When I hook the sensor back into the gauge and start the car the readings are off about 1 value. Are saying that I need to further offset the voltage when the car is running?
When the gauge is unhooked and reading 14.8 the voltage offset is only -0.1. When I turn the car on I have to change the offset to -0.45 or about. I was under the impression that I had to set the offset with the sensor unhooked from the gauge (only power on not engine running) so it stays at a solid 14.8 on the gauge and not jumping around.
When the gauge is unhooked from the o2 sensor, it reads 14.8 solid on the gauge so I can sync it with hondata using the voltage offset. I then work the offset value until I get hondata reading 14.8. When I hook the sensor back into the gauge and start the car the readings are off about 1 value. Are saying that I need to further offset the voltage when the car is running?
When the gauge is unhooked and reading 14.8 the voltage offset is only -0.1. When I turn the car on I have to change the offset to -0.45 or about. I was under the impression that I had to set the offset with the sensor unhooked from the gauge (only power on not engine running) so it stays at a solid 14.8 on the gauge and not jumping around.
Re: AEM A/F UEGO and Hondata S300 question
You must have the sensor hooked up when you set the votage offset.
Re: AEM A/F UEGO and Hondata S300 question
Ok. Thanks for clearing that up for me. I didn't know if I was seeing false readings or what.
Ryan
Ryan