Yamaha XV19SX(C) Service Manual page 480

2
b. Measure the fuel sender resistance.
L LLL L LLL L L LLL L L LLL L
ET1D71044
CHECKING THE FUEL LEVEL WARNING
LIGHT
This model is equipped with a self-diagnosis de-
vice for the fuel level detection circuit.
1. Check:
• Fuel level warning light "1"
(Turn the main switch to "ON".)
Warning light comes on for a few seconds,
then goes off → Warning light is OK.
Warning light does not come on → Replace
the meter assembly.
Warning light flashes eight times, then goes
off for three seconds in a repeated cycle (mal-
function detected in fuel sender or thermistor)
→ Replace the fuel pump assembly.
1
EAS28240
CHECKING THE SPEED SENSOR
1. Check:
• Speed sensor output voltage
Out of specification → Replace.
Output voltage reading cycle
0.6 V to 4.8 V to 0.6 V to 4.8 V
M MMM M MMM M M MMM M M MMM M
a. Connect the pocket tester (DC 20 V) to the
speed sensor coupler as shown.
1
G/W B
B
R/L
L LLL L L LLL L LLL
M MMM M M MMM M MMM
7-89
ELECTRICAL COMPONENTS
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
white "1"
• Negative tester probe →
black "2"
1
W
2
b. Turn the main switch to "ON".
c. Elevate the rear wheel and slowly rotate it.
d. Measure the voltage of white and black. With
each full rotation of the rear wheel, the volt-
age reading should cycle from 0.6 V to 4.8 V
to 0.6 V to 4.8 V.
L LLL L LLL L L LLL L L LLL L
EAS28300
CHECKING THE THROTTLE POSITION
SENSOR
1. Remove:
• Throttle position sensor
(from the throttle body)
2. Check:
• Throttle position sensor maximum resistance
Out of specification → Replace the throttle
position sensor.
Resistance
XV19S(C)/ XV19M(C)/
XV19CTS(C)/ XV19CTM(C):
4.0–6.0 kΩ/blue-black
XV19CS(C)/ XV19C(C):
3.1–5.7 kΩ/blue-black
M MMM M MMM M M MMM M M MMM M
a. Connect the pocket tester (Ω × 1k) to the
throttle position sensor terminals as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
W/Y
L L
B
B/ L
L LLL L L LLL L LLL
M MMM M M MMM M MMM