OBD-II Drive Mode Outline

- Performing the Drive Mode inspects the OBD-II system for proper operation and must be performed to ensure that no additional DTCs are present.
- During Drive Mode, the following systems are inspected:
- EGR system
- Oxygen sensor (HO2S)
- Oxygen sensor heater
- Catalytic converter (TWC)
- Fuel, misfire and evaporative (EVAP) system

CAUTION:
- While performing the Drive Mode, always operate the vehicle in a safe and lawful manner.
- When the NGS tester is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the NGS tester using the PID/DATA MONITOR AND RECORD function and inspect later.


NOTE:
- Vehicle speed and engine speed detected by the PCM may differ from that indicated by the speedometer and tachometer. Use the NGS tester to monitor vehicle speed.
- If the OBD-II system inspection is not completed during the Drive Mode, the following causes are considered:
- The OBD-II system detects the malfunction.
- The Drive Mode procedure is not completed correctly.

- Disconnecting the battery will reset the memory. Do not disconnect the battery during and after Drive Mode.
- The NGS tester can be used at anytime through the course of Drive Mode to monitor the completion status. Monitoring can be done by viewing the ON BOARD SYSTEM READINESS menu.