Yamaha FJR13AEV(C), Service Manual

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ABS (ANTI-LOCK BRAKE SYSTEM)
8-153
6. Hydraulic unit
If the malfunction is not corrected after checking items (1) to (5), replace the hydraulic unit. Be sure
to connect the brake hoses and couplers correctly and securely. Check the hydraulic unit operation.
Refer to “HYDRAULIC UNIT OPERATION TESTS” on page 4-60.
Malfunction code 31 (Disconnection is detected in the battery and ABS ECU circuit.)
1. ABS motor fuse
• Check if the ABS motor fuse in the starter relay is blown.
2. Coupler between the battery and the ABS ECU
• Check if the coupler is connected properly.
3. Wire harness and ABS wire harness
• Turn the main switch to “OFF” and disconnect the ABS ECU coupler and battery leads.
• Check for continuity between the positive battery terminal and the red/blue terminal of the ABS ECU
coupler.
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.
4. ABS ECU
• If the malfunction is not corrected after checking items (1) to (3), replace the ABS ECU.
Malfunction code 32 (ABS ECU circuit is broken or short-circuited.)
1. ABS ECU circuit (positive battery terminal to red/white terminal of the ABS ECU coupler)
• Turn the main switch to “OFF” and disconnect the ABS ECU coupler and battery leads.
• Check for continuity between the positive battery terminal and the red/white terminal of the ABS ECU
coupler.
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 there is continuity, repair or replace the defective harness.
2. ABS ECU circuit (brown/white terminal to red/white terminal of the ABS ECU coupler)
• Turn the main switch to “OFF” and disconnect the ABS ECU coupler.
• Check for continuity between the brown/white and the red/white terminals of the ABS ECU coupler.
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 there is continuity, repair or replace the defective harness.
3. ABS ECU
• If the malfunction is not corrected after checking items (1) to (2), replace the ABS ECU.
Malfunction code 33 (ABS motor is defective (ABS motor stops and will not rotate).)
1. ABS motor fuse
• Check if the ABS motor fuse in the starter relay is blown.
2. ABS motor relay
• Check if the ABS motor relay operates correctly.
Refer to “MAINTENANCE OF THE ABS MOTOR RELAY” on page 8-132.
Terminal color
Solenoid ABS wire harness
Front brake white, white red/white, white/blue
Rear brake green, green red/white, white/green
Unified brake system red, red red/white, white/yellow