Open Loop Operation

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Engine is in Open Loop Operation mode whenever engine operating conditions do not meet programmed criteria for Closed Loop mode. At this time, air/fuel ratio is determined by engine operation rather than exhaust gas composition. Oxygen sensor data is not accepted in this mode. The following conditions keep the system in Open Loop:

Engine Starting
Engine Temperature Too Low
Oxygen Sensor Temperature Too Low
Engine at Idle Speed
Wide Open Throttle Position
Insufficient Battery Voltage