A drive cycle requires starting a cold engine and driving the vehicle until the engine reaches normal operating temperature. If you are checking an OBD II system and discover that one or more of the monitors have not run, it may be necessary to test drive the vehicle to set the remaining monitors.Īn OBD II drive cycle is not just turning the ignition key on and off or starting the engine.
#Fuel system monitor not ready simulator#
Some vehicles require very specific drive cycles (called “drive traces” if you perform them on a road simulator or dyno) to activate certain self-checks like the catalyst and EVAP monitors. The requirements for the various monitors can vary considerably from one vehicle manufacturer to another, so there is no “universal” drive cycle that will guarantee all the monitors will be set and ready. To set the converter monitor, for example, the vehicle may have to be driven a certain distance at a variety of different speeds. Each monitor has certain operating requirements that must take place before the self-check will run. Getting all the monitors to run can be tricky on some vehicles.
A bad or slow oxygen sensor, for example, will prevent the catalyst monitor from running.
#Fuel system monitor not ready code#
If OBD II detects a fault when running a monitor, the setting of a code may prevent the remaining monitors from running. The motorist must drive the vehicle and come back again, or take a tailpipe test, if that is an option. But, if all the required monitors have not run, the vehicle can’t be given an OBD II test. If OBD II has run all the available monitors and finds no faults, the MIL remains out and the vehicle passes the emissions test. When OBD II runs a self-check on a particular component or system, it lets you know by setting readiness flags, which are displayed on your code reader or scan tool. Some vehicles have readiness issues when it comes to setting all the OBD II monitors. One of the EPA requirements for using a plug-in OBD II check in lieu of a tailpipe test is to make sure the OBD II system is ready and has run its system monitors.
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