Yamaha YZF-R1(B) 2012 Service Manual

Also see for YZF-R1 2012: Service manual

Contents

FUEL INJECTION SYSTEM8-85A. Rear speed sensor system malfunctionItem/components andprobable cause Check or maintenance job Sensor inspection proce-dure1 Connection of rear speedsensor (meter) couplerCheck the connection of thecoupler is secure.Remove the coupler, andcheck each pin (for bending,wear, or locking).Poor connection → Connectit securely, or repair/replacethe wire harness.Start the engine, and checkthe connection of the coupleris secure.Ride on the vehicle at a lowspeed (approx. 20–30 km/h).Then, check the fault codeindication.No fault code indicated. →Recovered.Fault code indicated. →Check the next step.2 Connection of main harnessECU couplerCheck the connection of thecoupler is secure.Remove the coupler, andcheck each pin (for bending,wear, or locking).Poor connection → Connectit securely, or repair/replacethe wire harness.Start the engine, and checkthe connection of the coupleris secure.Ride on the vehicle at a lowspeed (approx. 20–30 km/h).Then, check the fault codeindication.No fault code indicated. →Recovered.Fault code indicated. →Check the next step.3 Continuity of wire harness Open or short circuit →Replace the wire harness.Black/Blue–Black/BlueBlue–BlueWhite/Yellow–White/YellowStart the engine, and checkthe connection of the coupleris secure.Ride on the vehicle at a lowspeed (approx. 20–30 km/h).Then, check the fault codeindication.No fault code indicated. →Recovered.Fault code indicated. →Check the next step.4 Rear speed sensor malfunc-tionRefer to “CHECKING THEREAR SPEED SENSOR” onpage 8-141.Replace the rear speed sen-sor.Start the engine, and checkthe connection of the coupleris secure.Ride on the vehicle at a lowspeed (approx. 20–30 km/h).Then, check the fault codeindication.No fault code indicated. →Recovered.Fault code indicated. →Check the next step.5 Malfunction of the ECU orspeedometer.Replacement of the ECU orspeedometer.