On-Board System Readiness Test Mode

On-Board System Readiness (OSR) test mode indicates OBD II system operating status. World Diagnostic System (WDS) or equivalent scan tool will determine which monitored function has not been completed. Misfires, fuel system and comprehensive components are continuous monitoring-type functions. Catalyst, EGR system, EVAP system and oxygen sensor are monitored during each drive cycles (modes). See DRIVE MODES . To access OSR, perform following procedure:

1. Apply parking brake. Place shift lever in Park (A/T) or Neutral (M/T). Block wheels. Turn off all electrical accessories. Ensure engine is at normal operating temperature.
2. Perform visual inspection. Ensure air cleaner and inlet ducts are clean, and system wiring harness is properly connected. Check for bent or broken connector terminals and corroded or loose wires. Check PCM, sensors and actuators for physical damage. Check engine coolant for proper level and mixture. Check for proper transmission fluid level and quality.
3. Turn ignition switch off. Connect scan tool to DLC-2 located at left side of steering column, under instrument panel. Follow scan tool manufacturer's operating instructions to connect equipment and operate on-board readiness test.