Yamaha FZ8NA Service Manual page 536

EAS4B56020
[C-3] THE ABS WARNING LIGHT REMAINS ON
1. The battery voltage is low.
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING THE BATTERY" on page 8-186.
• If the battery voltage is low, clean the battery terminals and recharge it, or replace the battery.
2. ABS ECU fuse
• Check the ABS ECU fuse for continuity.
Refer to "CHECKING THE FUSES" on page 8-185.
• If the ABS ECU fuse is blown, replace the fuse.
3. ABS ECU coupler
• Check that the ABS ECU coupler is connected properly.
• Connect the couplers properly if necessary.
4. There is a break in the wire harness between the main switch and the ABS ECU or between the
ABS ECU and the ground.
• Check for continuity between the Brown/Blue terminal of the main switch coupler and Brown/
Blue terminal of the ABS ECU fuse.
• Check for continuity between the Brown/White terminal of the ABS ECU fuse and the Brown/
White terminal of the ABS ECU coupler.
• If there is no continuity, the wire harness is defective. Properly repair or replace the wire har-
ness.
• Check for continuity between the Black/White terminal of the ABS ECU coupler and the
ground.
• If there is no continuity, the wire harness is defective. Properly repair or replace the wire har-
ness.
5. There is a break in the wire harness between the ABS ECU and the meter assembly (ABS warn-
ing light).
• Check for continuity between the Green/Red terminal of the ABS ECU coupler and the Green/
Red terminal of the meter assembly coupler.
• If there is no continuity, the wire harness is defective. Properly repair or replace the defective
harness.
6. The meter assembly circuit is defective.
• Disconnect the ABS ECU coupler.
• The white/red terminal of the ABS ECU coupler is short-circuited to the ground.
• Turn the main switch to "ON", and then check the ABS warning light.
• If the ABS warning light is on, the internal circuit of the meter assembly is defective. Replace
the meter assembly.
• If the ABS warning light does not come on, the ABS ECU is defective. Replace the hydraulic
unit assembly.
7. The hydraulic unit assembly is defective.
EAS4B56021
[C-4] THE ABS WARNING LIGHT FLASHES
1. Check whether the T/C terminal (sky blue) of the ABS test coupler is short-circuited to the
ground when the test coupler adapter is removed.
• If the T/C terminal is short-circuited to the ground, the wire harness is defective. Properly
repair or replace the wire harness.
• If the T/C terminal is not short-circuited to the ground, the internal circuit of the meter assembly
is defective. Replace the meter assembly.
ABS (ANTI-LOCK BRAKE SYSTEM)
8-141