2003 Honda Accord Owner's Manual - Page 378

State Emissions Testing Select a nearby lightly traveled major highway where you can maintain a speed of 50 to 60 mph (80 to 97 km/h) for at least 20 minutes. Drive on the highway in D (A/T) or 5th (M/T). Do not use the cruise control. When traffic allows, drive for 90 seconds without moving the accelerator pedal. (Car speed may vary slightly; this is okay.) If you cannot do this for a continuous 90 seconds because of traffic conditions, drive for at least 30 seconds, then repeat it two more times (for a total of 90 seconds). Then drive in city/suburban traffic for at least 10 minutes. When traffic conditions allow, let the car coast for several seconds without using the accelerator pedal or the brake pedal. If the testing facility determines the readiness codes are still not set, see your Honda dealer. Technical Information 375