2007-2008 Yamaha YFM700 Grizzly Factory Service Manual, Page 295Get this manual
FUEL INJECTION SYSTEM Fault code No42
Symptom No normal signals are received from the speed sensorSpeed sensor Check or maintenance job Check the coupler for any pins that may be pulled out Check the locking condition of the coupler If there is malfunction, repair it and connect the coupler securelyReinstatement method Starting the engine, and activating the vehicle speed sensor by operating the vehicle at 20 to 30 kmh