2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 290Get this manual
FUEL INJECTION SYSTEM Fault code No39 Symptom Open circuit detected in injectorInjector Check or maintenance job Check the couplers for any pins that may be pulled out Check the locking condition of the couplers If there is malfunction, repair it and connect the coupler securely Repair or replace if there is an open or short circuit Between injector coupler and ECU coupler(redblueredblue) (redred) Execute the diagnostic mode(Code No.d36) Replace if defectiveRefer to "CHECKING THE FUEL INJECTOR"Diagnostic code Nod36