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 PID.
- Access the VSS and TP, PID.
- Ensure that all accessories are off, including A/C.
- Start the engine and the stopwatch.
- Idle the vehicle for approximately 5 minutes.
- Drive with steady throttle at the specified speed until the stopwatch indicates one minute.NOTE: If the vehicle speed drops below the indicated speed, the monitoring will temporarily stop until the vehicle reaches the proper speed range again.
- When the stopwatch indicates one minute, drive with a steady throttle between 45-65 MPH (72-104 kph) for A/T or 42-62 MPH (68-100 kph) for M/T (4th gear) as indicated by NGS, or 47-65 MPH (75-101 kph) for A/T or 44-60 MPH (71-77 kph) for M/T (4th gear) as indicated by the speedometer. Drive at this pattern for at least 20 seconds. At this point the catalyst monitor is complete.
- Turn ignition off and disconnect test equipment.