Vehicle Testing Procedures
6-5
5. Insert the sample probe into the tail pipe and secure to
prevent it from falling out of the tail pipe. When performing
this test on the road, the probe can be secured by tying the
exposed metal portion of the sample probe with
"mechanics wire” to an adjacent bracket, like the bumper
brackets, shipping tie down hooks, fuel tank straps, etc.
6. Enter the Measurement page.
7. Perform one of the following drive cycles, as desired.
90 Second On Road Drive Cycle
•
Accelerate to about 30 mph (50 km/h), at medium throttle. If the
vehicle has a manual transmission, it should be in third gear at
35 mph (55 km/h).
— For the first 30 to 40 seconds, vary the vehicle speed
between 25 and 35 mph (40 to 55 km/h).
•
Come to a stop, and wait about 5 seconds.
•
Accelerate to about 50 mph (80 km/h), at medium throttle. If the
vehicle has manual transmission, it should be in high gear at 80
km/h
— Vary the speed between about 50 to 55 mph (80 to 90 km/
h) for about another 40 seconds.
•
Decelerate to idle and end drive cycle.
Hard Acceleration Drive Cycle
•
Accelerate to about 15 mph (25 km/h), at moderate throttle.
— From 15 mph (25 km/h), accelerate to 55 mph (90 km/h) in
about 10 seconds with automatic transmission upshifting
normally or manual transmission in third gear at 90 km/h.
•
Maintain speed at 55 mph (90 km/h) for about 10 seconds, then
decelerate back to 15 mph (25 km/h).
•
Repeat this cycle once more so emissions levels can be
compared cycle to cycle.
High Cruise Drive Cycle
•
Accelerate to about 55 mph (90 km/h), at moderate throttle the
vehicle should be in high gear at 55 mph (90 km/h).
— Vary the speed between about 45 to 55 mph (70 to 90 km/
h) for about 90 to 120 seconds.
•
Decelerate to idle and end drive cycle.
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