Yamaha R15 2022 Service Manual page 442

EAS31163
[A-4] ONLY THE ABS ECU FAILS TO COMMUNICATE (The select unit screen does not appear.)
1. ABS control unit fuse
• Check the ABS control unit fuse for continuity.
Refer to "CHECKING THE FUSES" on page 8-142.
• If the ABS control unit fuse is blown, replace the fuse.
2. ABS ECU coupler
• Check that the ABS ECU coupler is connected properly.
For information about connecting the ABS ECU coupler properly, refer to "INSTALLING THE HY-
DRAULIC UNIT ASSEMBLY" on page 4-52.
3. Wire harness
• Open circuit between the main switch and the ABS ECU, or between the ABS ECU and the ground.
Check for continuity between brown terminal of the main switch coupler and brown/white terminal of
the ABS ECU coupler.
Check for continuity between black/white terminal of the ABS ECU coupler and the ground, and be-
tween the black terminal of the ABS ECU coupler and ground.
If there is no continuity, the wire harness is defective. Replace the wire harness.
• Open circuit in the wire harness between the ABS ECU coupler and the Yamaha diagnostic tool cou-
pler / ABS test coupler.
Check for continuity between blue/red terminal of the ABS ECU coupler and blue/red terminal of the
Yamaha diagnostic tool coupler / ABS test coupler.
Check for continuity between blue/black terminal of the ABS ECU coupler and blue/black terminal
of the Yamaha diagnostic tool coupler / ABS test coupler.
4. ABS ECU malfunction
Replace the hydraulic unit assembly.
EAS31164
[A-5] ABS ECU AND FI ECU FAIL TO COMMUNICATE (Cannot connect due to a tool error.)
1. Yamaha diagnostic tool
Check that the Yamaha diagnostic tool is properly connected.
2. Wire harness
• Open circuit in the wire harness between the ABS ECU coupler and the Yamaha diagnostic tool cou-
pler / ABS test coupler.
Check for continuity between blue/red terminal of the ABS ECU coupler and blue/red terminal of the
Yamaha diagnostic tool coupler / ABS test coupler.
Check for continuity between blue/black terminal of the ABS ECU coupler and blue/black terminal
of the Yamaha diagnostic tool coupler / ABS test coupler.
EAS31165
[B-1] MALFUNCTION ARE CURRENTLY DETECTED
When the Yamaha diagnostic tool is connected to the Yamaha diagnostic tool coupler / ABS test cou-
pler, the fault codes will be displayed on the computer screen.
• A fault code is displayed. [B-2]
• A fault code is not displayed. [C-1]
EAS31166
[B-2] DIAGNOSIS USING THE FAULT CODES
This model uses the Yamaha diagnostic tool to identify malfunctions.
For information about using the Yamaha diagnostic tool, refer to the operation manual that is included
with the tool.
ABS (ANTI-LOCK BRAKE SYSTEM)
8-109
ELEC – +