Yamaha YZF-R1(B) 2012 Service Manual

Also see for YZF-R1 2012: Service manual

Contents

FUEL INJECTION SYSTEM8-57Fault code No. 20SymptomWhen the main switch is ON, there is a big difference in voltagevalue of the intake air pressure sensor and atmospheric pressuresensorFail-safe action Engine startup: PossibleRiding: PossibleDiagnostic monitor-ing code No.D:03D:02D:03Meter display Displays the intake air pressure.CheckingmethodSet the engine stop switch to “ ”, and then push the start switch“ ”. (If the display value changes, the performance is OK.)D:02Meter display Displays the atmospheric pressure.CheckingmethodCompare the actually measured atmospheric pressure with themeter display value.Item/components andprobable cause Check or maintenance job Sensor inspection proce-dure1 Intake air pressure sensormalfunctionCheck in the diagnostic mode(Code No. 03).When engine is stopped:Atmospheric pressure at thecurrent altitude and weatherconditions is indicated.0 m above sea level: Approx.101 kPa3000 m above sea level:Approx. 70 kPaIncorrect indication → Sensormalfunction → Replace theintake air pressure sensor.Sensor inspection procedureRefer to “CHECKING THEINTAKE AIR PRESSURESENSOR” on page 8-146.Place the main switch to theON position, and check thefault code indication.No fault code indicated. →Recovered.Fault code indicated. →Check the next step.