Suzuki DL650K5 Service Manual page 609

DTC "41" (C1641): WHEEL SPEED SENSOR SIGNAL MALFUNCTION (F)
POSSIBLE CAUSE
Too great air gap, worn or missing teeth, noise, interference
between lines, loose contact in wheel speed sensor connector,
wheel speed sensor not securely fastened, input amplifier in
ABS control unit failure, etc.
Step 1
1) Inspect the clearance between the front wheel speed sensor
and sensor rotor using the thickness gauge.
$ Wheel speed sensor – sensor rotor clearance:
# 09900-20803: Thickness gauge
09900-20806: Thickness gauge
Is the clearance OK?
YES Go to step 2.
NO Adjust the clearance.
Step 2
1) Inspect the front wheel speed sensor rotor for damage and
check that no foreign objects are caught in the rotor open-
ings.
Is the sensor rotor OK?
YES Go to step 3.
NO Clean or replace the sensor rotor.
Step 3
1) Check that the front wheel speed sensor is mounted steadily.
Is the sensor mounted steadily?
YES Go to DTC "42" (C1642). (!Page 106)
Tighten the mounting bolts or replace the bracket
NO
if necessary.
0.3 – 1.5 mm (0.012 – 0.059 in)
DL650K7/AK7 ('07-MODEL) 13-105