Yamaha XSR900 2022, Service Manual

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9-40
ABS (Anti-lock Brake System)
EAS32901
[A-4] ONLY THE ABS ECU FAILS TO COMMUNICATE
1. ABS ECU fuse
• Check the ABS ECU fuse for continuity.
Refer to “CHECKING THE FUSES” on page 8-40.
• If the ABS ECU 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 4-55.
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/blue terminal of the main switch coupler and red/black terminal
of the ABS ECU coupler.
Check for continuity between black terminal of the ABS ECU coupler and the 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 YDT coupler.
Check for continuity between blue/white terminal of the ABS ECU coupler and blue/white terminal of
the YDT coupler. (CANH)
Check for continuity between blue/black terminal of the ABS ECU coupler and blue/black terminal of
the YDT coupler. (CANL)
4. ABS ECU malfunction
Replace the hydraulic unit assembly (ABS ECU).
EAS32902
[A-5] ABS ECU AND FI ECU FAIL TO COMMUNICATE
1. YDT
Check that the YDT is properly connected.
2. Wire harness
• Open circuit in the wire harness between the ABS ECU coupler and the YDT coupler.
Check for continuity between blue/white terminal of the ABS ECU coupler and blue/white terminal of
the YDT coupler. (CANH)
Check for continuity between blue/black terminal of the ABS ECU coupler and blue/black terminal of
the YDT coupler. (CANL)
EAS32903
[B-1] MALFUNCTION ARE CURRENTLY DETECTED
When the YDT is connected to the YDT coupler, the DTC will be displayed on the computer screen.
• A DTC is displayed. [B-2]
• A DTC is not displayed. [C-1]