2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 281Get this manual
FUEL INJECTION SYSTEM Fault code No12
Symptom No normal signals are received from the crankshaft position sensor Check or maintenance job Check for looseness or pinching 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 securely Repair or replace if there is an open or short circuit Between the crankshaft position sensor coupler and ECU coupler(graygray) (blackblueblackblue) Replace if defectiveRefer to "IGNITION SYSTEM" in chapter 9Reinstatement method Cranking the engine