Yamaha tmax XP500A, Service Manual

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4 - 106
CHAS
ANTI-LOCK BRAKE SYSTEM (XP500A)
• [C-5] Diagnosis by the malfunction code
Malfunction codes are used to determine the malfunctions that have occurred. (Refer to “[B-4] ABS
malfunction check using the ABS self-diagnosis (past malfunction)” and “[B-5] ABS malfunction
check using the ABS self-diagnosis (present malfunction)”.) The malfunction codes are explained in
the following table.
NOTE:
_
Record all of the malfunction codes displayed and check the check points.
Malfunction
code
Problem Check point Reference
11
*1
Front wheel sensor signal is not received prop-
erly. • Installation of the front wheel sensor
• Front wheel sensor lead and coupler
• Wire harness (ABS system’s circuit)
• Front wheel sensor rotor [C-5-1] Mal-
function code
11
(page 4-108)
12
Rear wheel sensor signal is not received prop-
erly. • Installation of the rear wheel sensor
• Rear wheel sensor lead and coupler
• Wire harness (ABS system’s circuit)
• Rear wheel sensor rotor [C-5-2] Mal-
function code
12
(page 4-108)
13 (front)
14 (rear)
Incorrect signal is detected by the front (13) or
rear (14) wheel sensor.
13
14
• Wheel sensor installation
• Wheel sensor housings
• Wheel sensor rotors [C-5-3] Mal-
function codes
13 (front
wheel) and 14
(rear wheel)
(page 4-109)
15 (front)
16 (rear)
No continuity in the front or rear wheel sensor
circuits
15
16
• Continuity of sensor circuits
• Wire harness (ABS system’s circuit)
• Connection of sensor coupler [C-5-4] Mal-
function codes
15 (front wheel
sensor) and
16 (rear wheel
sensor)
(page 4-109)
21
Hydraulic unit solenoid circuit is broken or short-
circuited. • Wire harness (ABS system’s circuit)
• Hydraulic unit solenoid coupler
• Hydraulic unit solenoid [C-5-5] Mal-
function code
21
(page 4-109)
31
Disconnection is detected on the system of fail-
safe relay and hydraulic unit solenoid coupler. • Wire harness (ABS system’s circuit)
• Fail-safe relay circuit
• Hydraulic unit solenoid coupler [C-5-6] Mal-
function code
31
(page 4-110)
32
Defective operation of the fail-safe relay is
detected. • Fail-safe relay
• Wire harness (ABS system’s circuit) [C-5-7] Mal-
function code
32
(page 4-110)
33
Defective operation of the ABS motor is
detected. (ABS motor stops and will not rotate.) • Wire harness (ABS system’s circuit)
• ABS motor coupler
• Fail-safe relay
• ABS motor circuit [C-5-8] Mal-
function code
33
(page 4-111)