Yamaha YZ250FM 2021 Owner's Service Manual

FUEL INJECTION SYSTEM8-34Fault code No. 50TIPBefore troubleshooting, disconnect the starter motor lead from the starter relay.Fault code No. 70TIPIt is not a malfunction.If the engine is forcibly stopped by leaving idle, the recovered state is recorded by malfunction mode.6 Delete the fault code. Confirm that the fault code hasa condition of “Recovered”using the Yamaha diagnostictool, and then delete the faultcode.Fault code No. 50Item ECU: faulty ECU memory.Fail-safe system Unable to start engineUnable to drive vehicleDiagnostic code No. —Diagnostic tool display —Procedure —Item Probable cause of malfunc-tion and check Maintenance job Confirmation of service com-pletion1 Faulty ECU. Replace the ECU. Start switch to ON (main relayON), and then check the condi-tion of the fault code using themalfunction mode of theYamaha diagnostic tool.Check that the fault code num-ber is not displayed.Fault code No. 70Item Engine forcibly stops when the vehicle is left idling for a long periodof time.Fail-safe system —Unable to drive vehicleDiagnostic code No. —Diagnostic tool display —Procedure —Item Probable cause of malfunc-tion and check Maintenance job Confirmation of service com-pletionFault code No. 46Item Vehicle system power supply: normal voltage is not supplied to theECU.