Yamaha MT-03 Service Manual

Also see for MT-03: Owner's manual Owner's manual Owner's manual

7-28FUEL INJECTION SYSTEMTROUBLESHOOTING DETAILSThis section describes the countermeasures per fault code number displayed on the FI diagnostictool. Check and service the items or components that are the probable cause of the malfunction fol-lowing the order given.After the check and service of the malfunctioning part has been completed, reset the FI diagnostictool display according to the “Reinstatement method”.Fault code No.:Fault code number displayed on the FI diagnostic tool when the engine failed to work normally.Refer to “Diagnostic code table”.Diagnostic code No.:Diagnostic code number to be used when the diagnostic mode is operated. Refer to “DIAGNOS-TIC MODE”.Fault code No. 12 Symptom No normal signals are received from the crankshaft position sensor.Used diagnostic code No. – –Order Item/components Check or maintenance job Restore method1 Crankshaft position sensor installa-tionCheck the sensor for looseness or pinching. Reinstated by crank-ing the engine.2 Coupler connectionsCrankshaft position sensor cou-plerECU couplerCheck the couplers for any pins that may havepulled out.Check that the couplers are securely locked.If necessary, repair the coupler or securely con-nect it.3 Open or short circuit in the wire har-nessRepair or replace if there is an open or short cir-cuit between the wire harnesses.Gray - GrayGreen/White - Black/Blue4 Defective crankshaft position sen-sorReplace the sensor if it is defective.Refer to “IGNITION SYSTEM” on page 8-1.Waiting for connection.... No signals are received from theECU.• Improper connection in connecting lead.• The main switch is OFF position.• Malfunction in FI diagnostic tool.• Malfunction in ECU.ERROR 4 Commands from the FI diagnostictool are not accepted by the ECU.• Turn the main switch to “OFF” once, and then set the FI diagnos-tic tool to CO adjustment mode or diagnostic mode.• Vehicle battery is insufficiently charged.• Malfunction in FI diagnostic tool.• Malfunction in ECU.LCD Display Symptom Probable cause of malfunctionCommunication error with the FI diagnostic tool