Kubota WG1605 Service Training page 57

Oxygen (O
Feedback Control (Closed Loop)
Orange line is air fuel ratio as controlled by the ECU based on O
feedback. Oxygen sensor is sensing mixture and providing feedback.
WG1605 is in "Open Loop" for one minute after start up (predetermined
fuel mixture, not controlled by oxygen sensor), then is controlled by closed-
loop mode for all operating parameters.
) Sensor:
2
Lean Zone
Theoretical
air/fuel ratio
Rich Zone
KUBOTA ENGINE AMERICA
Service Training
sensor
2