rusefi_documentation/WBO.md

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Wide band oxygen.
We have cj125 integration
TODO: document it better
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# cj125 troubleshooting
We have a few rusEFI console commands relevant for cj125
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``cj125_info``
``cj125_restart``
``cj125_calibrate``
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![x](overview/wbo/cj125_heating_4_9.png)
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AndreiKA says Prometheus works
Matthew says 0.3 SOIC-24 boards works
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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
P=30
I=5
D=0.3
though you could probably use D=0 since the system is already damped so hard
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50Hz
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IP Pump Current
VS/IP=VM=common virtual ground for VS and IP
H+ Constant +12v
H- Heater control, low-side
4.9 pinout courtesy of https://www.wbo2.com/cable/lsuconns.htm
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![x](FAQ/LSU-4-9-17025hcon.gif)
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![x](FAQ/LSU_42_LSU_49_Plug_Comparsion.jpg)
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With SOIC-24 rusEFI module W1=W10=0R means LSU 4.2
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With SOIC-24 rusEFI module W1=W10=Do not populate means LSU 4.9
Q: Any troubleshooting hints when things do not work?
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A: VM wire between CJ125 and sensor is virtual ground, should measure 2.5v when sensor is connected and when sensor is disconnected.