Yamaha MTN850-A 2017 Service Manual page 484

EAS31163
[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 8-156.
• 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 4-52.
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/blue terminal of the main switch coupler and brown/red terminal
of the ABS ECU coupler.
Check for continuity between black/yellow 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 Yamaha diagnostic tool cou-
pler.
Check for continuity between light green/blue terminal of the ABS ECU coupler and light green/blue
terminal of the Yamaha diagnostic tool coupler. (CANH)
Check for continuity between light green/white terminal of the ABS ECU coupler and light
green/white terminal of the Yamaha diagnostic tool coupler. (CANL)
4. ABS ECU malfunction
Replace the hydraulic unit assembly.
EAS31164
[A-5] ABS ECU AND FI ECU FAIL TO COMMUNICATE
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.
Check for continuity between light green/blue terminal of the ABS ECU coupler and light green/blue
terminal of the Yamaha diagnostic tool coupler. (CANH)
Check for continuity between light green/white terminal of the ABS ECU coupler and light
green/white terminal of the Yamaha diagnostic tool coupler. (CANL)
EAS31165
[B-1] MALFUNCTION ARE CURRENTLY DETECTED
When the Yamaha diagnostic tool is connected to the Yamaha diagnostic tool coupler, 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)
Yamaha diagnostic tool USB
90890-03250
Yamaha diagnostic tool (A/I)
90890-03252
8-127