- External controller with analog output, like then AEM 30-4110 and similar products.
- External controller with CAN interface, like the AEM X-Series wideband controller/gauge.
rusEFI Wide band oxygen
rusEFI has two probably working implementations for Bosch wideband oxygen control:
- We have cj125 integration
- We like https://github.com/mck1117/wideband even more. See https://rusefi.com/forum/viewtopic.php?f=4&t=1856
rusEFI wideband module
TODO: document it better
We have a few rusEFI console commands relevant for cj125
AndreiKA says Prometheus works
Matthew says 0.3 SOIC-24 boards works
Wideband controller based on Bosch CJ125 chip
green is vUr, temperature feedback
red is duty cycle
yellow is vUa, the lambda current measurement
white is converted AFR
fully operating in <30 seconds
in to closed loop in ~18 seconds
though you could probably use D=0 since the system is already damped so hard
VS/IP=VM=common virtual ground for VS and IP
R Trim=Calibration resistor
H+ Constant +12v
H- Heater control, low-side
UN = Vs = sensor voltage output
4.9 pinout courtesy of https://www.wbo2.com/cable/lsuconns.htm
With SOIC-24 rusEFI module W1=W10=0R means LSU 4.2
With SOIC-24 rusEFI module W1=W10=Do not populate means LSU 4.9
Q: Any troubleshooting hints when things do not work?
A: VM wire between CJ125 and sensor is virtual ground, should measure 2.5v when sensor is connected and when sensor is disconnected.