Yamaha MTN1000 2016 Service Manual page 588

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Fault code No.
Item
Symptom
Order Item/components and probable cause
2
Open or short circuit in the wire harness
between the rear wheel sensor and the
hydraulic unit assembly
3
Defective rear wheel sensor or hydraulic
unit assembly
Fault code No. 21
Fault code No.
Item
Symptom
Order Item/components and probable cause
1
Defective hydraulic unit assembly
16
Rear wheel sensor (open or short circuit)
Open or short circuit is detected in the rear wheel sensor.
Check or maintenance job
• Check for continuity between the white terminal "1"
and the white terminal "4" and between the black ter-
minal "2" and the black terminal "5".
• If there is no continuity, the wire harness is defective.
Replace the wire harness.
• Check that there is no short circuit between the white
terminal "1" and the black terminal "2" and between
the white terminal "4" and the black terminal "5".
• If there is short circuit, the wire harness is defective.
Replace the wire harness.
• Check that there is no short circuit between the
black/white terminal "3" and the white terminal "4" and
between the black/white terminal "3" and the black ter-
minal "5".
• If there is short circuit, the wire harness is defective.
Replace the wire harness.
6. ABS ECU
7. Wheel sensor
If the above items were performed and no malfunctions
were found, the wheel sensor or hydraulic unit assembly
is defective. Replace the wheel sensor or hydraulic unit
assembly.
Refer to "REAR WHEEL" on page 4-31 and "ABS (Anti-
lock Brake System)" on page 4-65.
21
Hydraulic unit assembly (defective solenoid drive circuit)
Solenoid drive circuit in the hydraulic unit assembly is open or
short-circuited.
Check or maintenance job
Replace the hydraulic unit assembly.
Refer to "ABS (Anti-lock Brake System)" on page 4-65.
8-171
ABS (Anti-lock Brake System)
2
3
5
4
1
6
7

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