Drive Cycle Mode 1
NOTE:
For aid in Mode 1 description, refer to illustration. See Fig 1.
- Ensure that there are no vacuum and/or intake air system leaks.
- Run the engine for 3 minutes or until the engine reaches operating temperature 176°F (80°C).
- Ensure that all accessories are off, including A/C.
- Ground the 10 pin in the data link connector (DLC).
- Ensure proper ignition timing and correct if needed.
- Check and adjust engine RPM if necessary.
- Turn ignition switch to OFF position.
- Disconnect the TEN pin ground in the DLC.
- Set the parking brake and block the drive wheels.
- Place the transmission in PARK (A/T) or NEUTRAL (M/T).
- Restart the engine.
- Increase the engine speed to 1750 RPM and hold it there for 15 seconds.
- Repeat step 10 for each of the following engine speeds: 2000 RPM, 2250 RPM, 3000 RPM, 3500 RPM, 4000 RPM, 4250 RPM, 4500 RPM, 4750 RPM, 5000 RPM.
- Release the throttle and let engine idle for approximately 30 seconds.NOTE: If the cooling fan engages during the idle portion of this test, continue idling for 30 seconds after the cooling fan disengages.
- Turn ignition switch to OFF position.
- Monitor the MODE 1 PID to verify successful Mode 1 completion. If Mode 1 cannot be completed despite accurately following the procedure, go to CIRCUIT TEST QC - OBD-II MONITOR TESTING NOT COMPLETE to diagnose cause of Mode 1 failure.
- Turn ignition switch to OFF position.