Yamaha 2014 MT-07 Service Manual

ABS (ANTI-LOCK BRAKE SYSTEM)8-108Fault code No. 31TIPTurn the main switch to “OFF” before disconnecting or connecting a coupler.3 Open or short circuit in the wire harnessbetween the signaling system (tail/brakelight or brake light switch) and the hydrau-lic unit assembly• Between ABS ECU coupler and joint coupler.(yellow–yellow)• Between joint coupler and front brake light switch cou-pler.(yellow–yellow)• Between ABS ECU coupler and joint coupler.(yellow–yellow)• Between joint coupler and rear brake light switch cou-pler.(yellow–yellow)4 Defective hydraulic unit assembly If the above items were performed and no malfunctionswere found, replace the hydraulic unit assembly.Refer to “ABS (ANTI-LOCK BRAKE SYSTEM)” on page4-62.Fault code No. 24Item Brake light switch or tail/brake lightSymptom Brake light signal is not received properly while the vehicle is travel-ing (Brake light circuit, or front or rear brake light switch circuit).Order Item/components and probable cause Check or maintenance jobFault code No. 31Item Hydraulic unit assembly (abnormal ABS solenoid power supply)Symptom Power is not supplied to the solenoid circuit in the hydraulic unit as-sembly.Order Item/components and probable cause Check or maintenance job1 Blown ABS solenoid fuse Check the ABS solenoid fuse. If the ABS solenoid fuseis blown, replace the fuse and check the wire harness.Refer to “CHECKING THE FUSES” on page 8-127.2 Defective coupler between the batteryand the hydraulic unit assembly• Check the locking condition of the coupler.• If there is a malfunction, repair it and connect the cou-pler securely.See TIP.3 Open or short circuit in the wire harnessbetween the battery and the hydraulic unitassembly• Replace if there is an open or short circuit.• Between ABS ECU coupler and ABS solenoid fuse.(red/white–red/white)4 Defective hydraulic unit assembly If the above items were performed and no malfunctionswere found, replace the hydraulic unit assembly.Refer to “ABS (ANTI-LOCK BRAKE SYSTEM)” on page4-62.