Drive Cycle Mode 3
CAUTION:
Strict observance of posted speed limits and attention to driving conditions are mandatory when proceeding through the following drive cycle.
NOTE:
For aid in Mode 3 description, refer to illustration. See Fig 1.
NOTE:
For the Mode 3 driving procedure, it is best to use a stopwatch for accurate timing of the drive cycle.
NOTE:
Observing the diagnostic monitors while performing this mode will verify when the mode is complete, as the monitors will clear. If Mode 3 is performed properly and the monitors do not clear, either Mode 1 was not successfully completed or a concern exists with the vehicle.
- Ensure Mode 1 has been successfully completed.
- Turn ignition off. Connect scan tester to OBD-II DLC.
- Enter PID/DATA MONITOR menu selection. Access VSS and TP PIDs.
- Ensure all accessories are off including A/C.
- Start the engine and the stopwatch.
- Idle the vehicle for approximately 5 minutes.
- When the stopwatch indicates 5 minutes, begin driving the vehicle at a speed greater than 50 MPH (80 kph) as indicated by the NGS. Be very careful not to exceed 25% (1/4) throttle position as indicated by NGS.
- Drive with steady throttle at the specified speed until the stopwatch indicates one minute.
- When the stopwatch indicates one minute, drive with a steady throttle between 40-60 MPH (64-77 kph) as indicated by NGS or 39-54 MPH (63-87 kph) as indicated by the speedometer. Drive at this pattern for at least 3 minutes. At this point the catalyst monitor is complete.
- Turn ignition switch to OFF position and disconnect the test equipment.
NOTE:
If the vehicle speed drops below the indicated speed, the monitoring will temporarily stop until the vehicle reaches the proper speed range again.