2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 279Get this manual
FUEL INJECTION SYSTEM Fault code No50 Symptom Faulty ECU memory(When this malfunction is detected in the ECU, the fault code number might not appear on the LCD of the meter Probable cause of malfunction Malfunction in ECU(The program and data are not properly written on or read from the internal memory
Diagnostic code No
Sensor operation table
Diagnostic code Nod01 Item Throttle angle Fully closed position Fully opened position d03 d05 d06 Pressure difference (atmospheric pressure and intake air pressure) Intake air temperature Coolant temperature Vehicle speed pulse d07 Lean angle sensor d08 Upright Overturned d09 Fuel system voltage (battery voltage) Gear position switch d21 Neutral In gear d60 EEPROM fault code display No history History exists Malfunction history code display No history d61 History exists 00 Fault codes 12-50 (If more than one code number is detected, the display alternates every two seconds to show all the detected code numbersWhen all code numbers are shown, the display repeats the same process 00 01 ON OFF 3.74.4 0.41.4 Approximately 12.0 Compare with the actually measured battery voltage(If the battery voltage is lower, perform recharging Shift the transmission1520 95100 Displays the intake air pressureCheck with throttle fully closedCheck with throttle fully openOperate the throttle while pushing the start switch(If the display value changes, the performance is OK Compare the actually measured intake air temperature with the meterCompare the actually measured coolant temperature with the meterCheck that the number increases when the rear wheel is rotatedThe number is cumulative and does not reset each time the wheel is stoppedRemove the lean angle sensor and incline it more than 65 degreesMeter display Checking method