2008-2010 Kawasaki KFX450R Factory Service Manual, Page 109Get this manual
3-52 FUEL SYSTEM (DFI) Crankshaft Sensor (Service Code 21)
Start the engine and switch the diagnosis mode to Dealer mode to know all the problem that the DFI system has at the time of self-diagnosisIf the engine cannot be started, the self-diagnosis system does not detect dynamic condition of the crankshaft sensorIn this case, turn off the ignition switch and turn it on again to enter the Dealer modeIn this mode, the system tells all the troubles which the DFI system had in both static and dynamic conditions
Crankshaft Sensor RemovalInstallation