Yamaha FJR13AEV(C), Service Manual

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ABS (ANTI-LOCK BRAKE SYSTEM)
8-141
• The vehicle was continuously ridden on extremely uneven roads.
The system is normal.
• The front or rear brake light switch is defective or improperly adjusted.
Replace or adjust.
ET3P61068
[C-6] 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 8-218.
• If the battery voltage is low, clean the battery terminals and recharge it, or replace the battery.
2. A present malfunction is detected.
• Connect the test coupler adapter to the ABS test coupler and utilize the ABS self-diagnosis function
to check the present malfunctions.
• Perform the troubleshooting according to the detected malfunction codes.
Refer to “[C-7] DIAGNOSIS BY THE MALFUNCTION CODE” on page 8-142.
3. ABS is stopped by the ABS ECU
The ABS ECU may stop the ABS operation if it is exposed to extremely strong electromagnetic
waves or static electricity.
When the ABS ECU is no longer exposed to the electromagnetic waves or static electricity, and the
ABS warning light is not flashing, the ABS will operate again. Explain to the customer that the ABS
will operate normally.
4. ABS ECU fuse
• Check the ABS ECU fuse for continuity.
Refer to “CHECKING THE FUSES” on page 8-217.
• If the ABS ECU fuse is blown, replace the fuse.
5. ABS ECU couplers, ABS wire harness, front cowling wire harness, and wire harness
• Check the ABS ECU couplers and wire harness couplers for continuity.
• Check the ABS wire harness, front cowling wire harness, and wire harness for continuity.
Refer to “CIRCUIT DIAGRAM (1/2) (FJR13A)” on page 8-119, “CIRCUIT DIAGRAM (2/2) (FJR13A)”
on page 8-121, “CIRCUIT DIAGRAM (1/2) (FJR13AE)” on page 8-123, and “CIRCUIT DIAGRAM
(2/2) (FJR13AE)” on page 8-125.
• If the anti-lock brake system wiring is defective, properly connect or replace the ABS ECU couplers,
ABS wire harness, front cowling wire harness and wire harness.
6. Check the connection of the ABS wire harness to the ABS ECU.
• Check that the ABS wire harness is securely connected to the ABS ECU. (Refer to “ABS COUPLER
LOCATION CHART” on page 8-129.)
7. The ABS ECU, ABS wire harness, front cowling wire harness or wire harness couplers are discon-
nected.
• Connect the couplers if they are disconnected.
8. There is a break or disconnection in the wire harness, ABS wire harness, front cowling wire harness
between the ABS ECU and the meter assembly (ABS warning light).
• Check for continuity between the green/red terminal of the ABS ECU coupler and the green/red ter-
minal of the meter assembly coupler.
• If there is no continuity, ABS wire harness, front cowling wire harness or the wire harness is defec-
tive. Properly repair or replace the defective harness.
9. The meter assembly circuit is defective.
• Disconnect the ABS ECU couplers, and then connect the test coupler adapter to the ABS test cou-
pler.
• Ground the white/red lead of the test coupler adapter.
• Turn the main switch to “ON”, and then check that the ABS warning light goes off.
• If the ABS warning light does not go off, the meter assembly is defective. Replace the meter assem-
bly.
• If the ABS warning light goes off, the ABS ECU is defective. Replace the ABS ECU.