rusefi_documentation/WBO.md

WBO Overview

Do-i-need-wideband-oxygen-sensor

External WBO

• 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 the forum thread

rusEFI wideband module

See rusEFI-Wideband-Controller

See Hellen-WBO

TODO: document it better

cj125 troubleshooting

We have a few rusEFI console commands relevant for cj125

cj125_info

cj125_restart

cj125_calibrate

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

P=30

I=5

D=0.3

though you could probably use D=0 since the system is already damped so hard

50Hz

Older SOIC-24 board - double sided assembly

Newer LQFP-32 board - single side assembly

Naming Convention

IP=Pump Current

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.

Part Numbers

Connector Shells

Connector	Part Number
Female (harness)	1928404669
Male (sensor)	1928405111

Male connector is only needed when building extension harnesses. The connector on the sensor contains a laser-trimmed calibration resistor and should not be removed.

Female Terminals for Harness Side

Wire Size	Plating	Strip	Loose
24-22 AWG	Tin	1564324-1	1564325-1
24-22 AWG	Gold	1564324-2	1564325-2
20-18 AWG	Tin	1241380-1	1241381-1
20-18 AWG	Gold	1241380-2	1241381-2
16 AWG	Tin	1418884-1	1418885-1
16 AWG	Gold	unavailable	unavailable

Part numbers provided by and available for purchase at corsa-technic.com individually or as a kit. https://www.corsa-technic.com/item.php?item_id=1296

ADV

1J0973705 8R0906262E