Checking The Exup Servo Motor; Checking The Intake Air Pressure Sensor; Checking The Air Temperature Sensor - Yamaha XV19SW Service Manual

• Positive battery lead →
red/blue "2"
• Negative battery lead →
black "3"
3
1
d. Check the fuel pump operation.
L LLL L LLL L L LLL L L LLL L
EAS28360

CHECKING THE EXUP SERVO MOTOR

1. Check:
• EXUP servo motor operation
Out of specification → Replace.
M MMM M MMM M M MMM M M MMM M
a. Disconnect the EXUP cables from the EXUP
servo motor pulley.
b. Disconnect the EXUP servo motor coupler
from the wire harness.
c. Connect the battery leads to the EXUP servo
motor terminals as shown.
For counterclockwise rotation "a"
• Positive battery lead →
black/green "1"
• Negative battery lead →
black/red "2"
For clockwise rotation "b"
• Positive battery lead →
black/red "2"
• Negative battery lead →
black/green "1"
b
a
d. Check that the EXUP servo motor pulley ro-
tates several times in directions "a" and "b".
2
L LLL L L LLL L LLL
M MMM M M MMM M MMM
1 2
L W/R B/L
B/G B/R
7-90
ELECTRICAL COMPONENTS
ECA14390
CAUTION:
To prevent damaging the EXUP servo motor,
perform this test within a few seconds of
connecting the battery.
L LLL L LLL L L LLL L L LLL L
EAS28410
CHECKING THE INTAKE AIR PRESSURE
SENSOR
The following procedure applies to both of the in-
take air pressure sensors.
1. Check:
• Intake air pressure sensor output voltage
Out of specification → Replace.
Intake air pressure sensor output
voltage
3.75–4.25 V
M MMM M MMM M M MMM M M MMM M
a. Connect the pocket tester (DC 20 V) to the in-
take air pressure sensor coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
pink/white "1" or pink/yellow
• Negative tester probe →
black/blue "2"
b. Turn the main switch to "ON".
c. Measure the intake air pressure sensor out-
put voltage.
L LLL L LLL L L LLL L L LLL L
ET1D71016
CHECKING THE AIR TEMPERATURE
SENSOR
1. Remove:
• Air temperature sensor
L LLL L L LLL L LLL
M MMM M M MMM M MMM
2
1
B/L P/W L
L LLL L L LLL L LLL