On-Board Diagnostic (OBD II) Drive Cycle
OBD II Drive CycleOBD II regulations have established a vehicle drive cycle pattern that allows the ECM and Main Monitors to run and finish their diagnostic tests. Some of the Monitors run at Key On, some run after completion of an engine warm-up and some during a highway cruise period.
OBD II Trip
Each OBD II Monitor has a specific "trip or drive" pattern that allows it to meet required (run) conditions. A "trip" may start at Key On, or may not start until after an engine warm-up and highway cruise period.
Example OBD II Drive Cycle
This example drive cycle (A/C Off) includes: Key Off; engine start-up, drive the vehicle under the listed conditions, then turn the key Off.
1) At start-up, ECT should be over 50°F, IAT should be over 104°F
2) Intake air temperature during the trip should be 122°F or less.
3) On vehicles with an AT, the gear selector should be in Drive.
4) During acceleration, keep the throttle at 1/4 to 3/4 open position.
5) During deceleration, allow vehicle speed to go below 15 mph or engine speed to go below 1000 rpm (don't touch brake or clutch).
6) During cruise mode, keep the throttle position opening steady.
7) When stopped, keep throttle closed, A/C Off gear selector in N.