ABS (ANTI-LOCK BRAKE SYSTEM)
8-135
2. Teeth surfaces of the sensor rotors are defective.
• Check if there are flaws on the surfaces of the sensor rotor teeth. Also, check for any foreign mate-
rials.
Refer to “MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR” on page
4-16, “INSTALLING THE FRONT WHEEL (FRONT BRAKE DISCS)” on page 4-18, “MAINTE-
NANCE OF THE REAR WHEEL SENSOR AND SENSOR ROTOR” on page 4-22, and “INSTALL-
ING THE REAR WHEEL (REAR BRAKE DISC)” on page 4-23.
3. Sensor output has dropped.
• Sensor signal output may drop due to failure of the bearings, wheel axle, wheel, or sensor housing
of the front or rear wheel. Check these components, without removing them, for looseness, distor-
tion, and bends.
Malfunction codes 15 (front wheel) and 16 (rear wheel) (No continuity in the front or rear wheel
sensor circuit.)
Broken front or rear wheel sensor circuit is detected.
• Front or rear wheel sensor coupler is disconnected.
Refer to “MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR” on page
4-16, “INSTALLING THE FRONT WHEEL (FRONT BRAKE DISCS)” on page 4-18, “MAINTENANCE
OF THE REAR WHEEL SENSOR AND SENSOR ROTOR” on page 4-22, and “INSTALLING THE
REAR WHEEL (REAR BRAKE DISC)” on page 4-23.
• Front or rear wheel sensor or lead is broken.
Refer to “MAINTENANCE OF THE FRONT WHEEL SENSOR AND SENSOR ROTOR” on page
4-16, “INSTALLING THE FRONT WHEEL (FRONT BRAKE DISCS)” on page 4-18, “MAINTENANCE
OF THE REAR WHEEL SENSOR AND SENSOR ROTOR” on page 4-22, and “INSTALLING THE
REAR WHEEL (REAR BRAKE DISC)” on page 4-23.
• Front or rear wheel sensor circuit is broken.
Refer to “CIRCUIT DIAGRAM (1/2)” on page 8-111 and “CIRCUIT DIAGRAM (2/2)” on page 8-113.
• ABS wire harness is disconnected from the ABS ECU coupler terminal.
Refer to “MAINTENANCE OF THE ABS ECU” on page 8-120.
NOTE:
• Check that both the front and rear wheel sensor couplers are connected securely.
• If the vehicle is ridden after malfunction code 15 (front wheel) or 16 (rear wheel) is displayed, the mal-
function code will be overwritten from 15 to 11 (front wheel) or from 16 to 12 (rear wheel).
Malfunction code 21 (Hydraulic unit solenoid circuit is broken or short-circuited.)
1. Hydraulic unit solenoid coupler
• Check if a hydraulic unit solenoid coupler terminal is disconnected.
Refer to “ABS COUPLER LOCATION CHART” on page 8-117.
2. Hydraulic unit solenoids
• Check the solenoids (front brake, rear brake, and unified brake system) for continuity.
Refer to “MAINTENANCE OF THE HYDRAULIC UNIT” on page 8-120.
• Check the insulation between each solenoid terminal and the negative battery terminal.
Refer to “MAINTENANCE OF THE HYDRAULIC UNIT” on page 8-120.
3. ABS wire harness
• Check the white/green lead for continuity between “1” and “5” of the hydraulic unit solenoid circuit.
• Check the white/blue lead for continuity between “2” and “4” of the hydraulic unit solenoid circuit.
• Check the white/yellow lead for continuity between “3” and “6” of the hydraulic unit solenoid circuit.
• Check the red/white leads for continuity between “7” and “10”, between “8” and “10”, and between
“9” and “10” of the hydraulic unit solenoid circuit.
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