please use the cruise control to help you maintain speed and stay in the right lane for safety reasons. make sure to keep the speed on the freeway between 55 and 60 mph for a minimum of five miles. follow the basic drive cycle steps faithfully.also, many of the onboard computers still run until all of the doors are closed after the vehicle is shut off and the keys are removed. the keys must be out of the ignition and all of the doors must be closed while the vehicle sits over night because many of the onboard computers "boot up" when the keys are in the ignition.if the outside temperature is over 90° f, the fuel is too volatile and the evap system won't even try to run its tests, though some of the other emissions systems may run their tests. the engine temperature needs to match the air temperature in order to establish an accurate baseline for the testing. the vehicle must sit overnight, or for at least eight hours, in an environment that is less than 90° f.also, if the battery is weak or undercharged, some of the most important tests will never run. if you have to occasionally jump-start your vehicle, all of the memory from the powertrain control module (pcm) is erased, which includes the data that accurately tracks the results from various stages of the drive cycle. the vehicle must also have a good alternator and a strong battery.if the fuel tank is near empty or completely full, many of the basic tests will not run at all. some systems, especially the evap system, need to have a specific level of fuel in order for the tests to be trusted. have the fuel tank between 30 and 70 percent full. ![]() Step one: double check vehicle preparation
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