OBD-II Drive Mode Description

OBD-II drive mode is driving vehicle in specific pattern, in which OBD-II system is being inspected for proper operation. Drive mode must be performed to ensure no additional DTCs are present. During drive mode the Powertrain Control Module (PCM) will execute the following OBD-II diagnostic monitors:

EGR system.
Heated Oxygen Sensor (HO2S) and HO2Sheater.
Catalytic converter (TWC).
Fuel, misfire and evaporative (EVAP) emission control system.

DO NOT disconnect battery during and after drive mode. Disconnecting battery will reset memory. Drive mode can be used to cause a DTC to set if a fault is present or to verify that a DTC will not return after a repair has been completed.

CAUTION:

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

NOTE:

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