Snap-On Diagnostics DGA 1000, Manual, Page: 100 / 116

6-6
Vehicle Testing Procedures
On-Board Diagnostic (OBD) II Drive Cycle
Disconnecting the vehicle battery, powertrain control module
(PCM) or certain components controlled by the PCM on vehicles
with
OBD II may cause a “not ready for I/M testing” condition. In
this condition, the vehicle will not perform properly. Following a
specific
OBD II Drive Cycle restores normal operation of the PCM.
Perform this drive cycle on the road or use the dynamometer.
Select Road Simulation load type from the Dyno Control Panel
Screen when using the dynamometer.
While driving, OBD II systems perform a series of tests on specific
systems, monitoring then adjusting to compensate for those
conditions. These conditions are called an
OBD II Drive Cycle,
and requires just over 11 minutes to complete.
OBD II Drive Cycle
1. Run the engine for at least 4 minutes or until engine
coolant is about 180°F.
2. Idle the engine for 45 seconds.
3. Accelerate to 45 mph (1/4 throttle) for about 10 seconds.
4. Drive at steady throttle between 30 and 40 mph for 60
seconds.
5. Drive between 20 and 40 mph for 4 minutes.
6. Decelerate and idle for 10 seconds.
7. Accelerate to 55 mph (1/2 throttle) for 10 seconds.
8. Drive at steady throttle between 40 and 60 mph for 80
seconds.