On-Board System Readiness Test Mode

On-Board System Readiness (OSR) test mode indicates OBD-II system operating status by indicating status of each system monitor (complete or incomplete). If any monitor function is incomplete the WDS or scan tool will identify which monitor function has not been completed. Misfires, fuel system and comprehensive components are continuous monitoring-type functions. Catalyst, EGR system, EVAP system and oxygen sensor will be monitored under each drive cycle. OBD-II diagnostic system is initialized by performing the DTC cancellation procedure or disconnecting negative battery cable.