Hondata

• Honda civic ej2
• H22 turbo
• P28 s300v3
• 1000cc bosch ev14
• Aem xserie wideband

ECU modifications
Hondata S300 mod en cut the resistors R136, R138

Current version V2.7.5.0 28 Feb 2020

Hello guys,
We got some issues in the closedloop in the Hondata
When we activate the close loop there are unwanted fuel trims (more DutyCycle on the injectors)
I checked the ect and iat correction, stays on 0
I checked short and long trim. Also stay on 0
I cannot see why its changing the duty cycle on the ecu in closed loop?

In the meantime we here more tuners with the same kind of issues.

I hope you guys can help me out

In the zip file is the tune and datalog. If you look on the datalog you can see the afr go from 14.5 - 15 to 11 ish and back. Thats because i turn on the closeloop (wideband afr target) and off.
It also happens with the narrowband mode or volt target.

Greetings

I believe it is because the AEM stoichiometric voltage is high enough that the O2 input does strange things at that voltage. Sorry, but I cannot test this on a vehicle at the moment.

According to the calibration, you have it set to open loop and have a wideband input set to D14 and not D10.