ABS (NSS250A)
18-4
SERVICE INFORMATION
GENERAL
The ABS modulator may be damaged if dropped. Also, if the connector is disconnected when current is flowing, the exces-
sive voltage may damage the control unit. Always turn the ignition switch OFF before servicing.
• This section covers service of the ABS. For conventional brake service (page 17-4)
• When the scooter is running and the front wheel leaves the ground for a long time (wheelies), the ABS control unit
detects difference of the front and rear wheel speeds and then the indicator blinks.
• The ABS control unit is mounted on the modulator (the modulator with the built-in ABS control unit). Do not disassem-
ble the ABS modulator. Replace the ABS modulator as an assembly when it is faulty.
• When the ABS control unit detects a problem, it stops the ABS function and switches back to the conventional brake
operation, and the ABS indicator blinks or stays on. Take care during the test ride.
• Troubles not resulting from a faulty ABS (e.g. brake disc squeak, unevenly worn brake pad) cannot be recognized by the
ABS diagnosis system.
• Read "ABS TROUBLESHOOTING INFORMATION" carefully, inspect and troubleshoot the ABS system according to the
Diagnostic Troubleshooting flow chart. Observe each step of the procedures one by one. Write down the problem code
and probable faulty part before starting diagnosis and troubleshooting.
• After troubleshooting, erase the problem code and perform the pre-start self-diagnosis to be sure that the ABS indicator
is operating normally.
• When the wheel speed sensor and/or pulser ring is replaced, check the clearance (air gap) between both components.
• Be careful not to damage the wheel speed sensor and pulser ring when removing and installing the wheel.
• The following color codes are used throughout this section.
TORQUE VALUES
TOOL
Bu = Blue G = Green Lg = Light Green R = Red
Bl = Black Gr = Gray O = Orange W = White
Br = Brown Lb = Light blue P = Pink Y = Yellow
Brake pipe joint nut 14 N·m (1.4 kgf·m, 10 lbf·ft) Apply brake fluid to the threads.
Front pulser ring bolt 8 N·m (0.8 kgf·m, 5.9 lbf·ft) ALOC bolt; replace with a new one.
Rear pulser ring bolt 8 N·m (0.8 kgf·m, 5.9 lbf·ft) ALOC bolt; replace with a new one.
VS sensor protector socket bolt 10 N·m (1.0 kgf·m, 7 lbf·ft) ALOC bolt; replace with a new one.
Test probe
07ZAJ-RDJA110
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