Honda SH300 2006 Manual page 408

ANTI-LOCK BRAKE SYSTEM (ABS; SH300A/AII/AIII)
PROBLEM CODE 11, 12, 21, 41 or 42 (Front Wheel Speed Sensor)
• The ABS indicator might blink under unusual
riding or conditions (page 18-10). This is tempo-
rary failure. Erase the problem code (page 18-9)
then test ride the scooter above 30 km/h (18
mph) and check the problem code by retrieving
the self-diagnosis system (page 18-8).
• If the problem code 41 is indicated, check the
front brake for drag.
1. Speed Sensor Air Gap Inspection
Support the scooter securely using a hoist or
equivalent and raise the wheel off the ground.
Measure the clearance (air gap) between the
sensor and pulser ring at several points by turn-
ing the wheel slowly.
STANDARD: 0.2 – 1.2 mm (0.01 – 0.05 in)
Is the air gap correct?
YES
NO
2. Speed Sensor Condition Inspection
Inspect the area around the front wheel speed
sensor:
Check that there is iron or other magnetic depos-
its between the pulser ring and wheel speed sen-
sor, and the pulser ring slots for obstructions.
Check installation condition of the pulser ring or
wheel speed sensor for looseness.
Check the pulser ring and sensor tip for defor-
mation or damage (e.g., chipped pulser ring
teeth).
Are the sensor and pulser ring in good condi-
tion?
YES
NO
3. Speed Sensor Line Short Circuit Inspection (at
control unit side)
Disconnect the ABS modulator 25P connector
and the front wheel speed sensor 2P (Orange)
connector.
Check for continuity between the ABS modulator
connector of the wire harness side and ground.
CONNECTION: Pink/Black – Ground
Is there continuity?
YES
NO
18-14
– GO TO STEP 2.
– Check each part for deformation and
looseness and correct
Recheck the air gap.
– GO TO STEP 3.
– Remove any deposits. Install properly
or replace faulty part.
Green/Orange – Ground
– Short circuit in wire between the ABS
modulator and speed sensor.
– GO TO STEP 4.
accordingly.
PULSER RING
Green/Orange
Pink/Black
ABS MODULATOR
25P CONNECTOR
SPEED SENSOR