Yamaha F400A 2022 - Checking the Engine Temperature Sensor

5-37
Ignition unit and component
j. Turn the main switch or power switch
to ON.
k. Apply negative pressure to the intake
air pressure/temperature sensor slow-
ly, and then measure the output volt-
age at the specified pressure.
l. Turn the main switch or power switch
to OFF.
m. Disconnect the test leads and special
service tool.
n. Place the intake air pressure/tempera-
ture sensor in a container of water and
heat the water slowly.
o. Measure the intake air pressure/tem-
perature sensor resistance.
p. Install the intake air pressure/tempera-
ture sensor and connect the coupler.
See “ETV” (6-28).
Checking the engine temperature
sensor
1. Remove:
• Intake manifold (PORT)
See “Intake manifold” (6-24).
2. Check:
• Engine temperature sensor
a. Disconnect the engine temperature
sensor coupler “a”.
b. Turn the main switch or power switch
to ON, and then measure the input volt-
age at the engine temperature sensor
coupler.
Vacuum/pressure pump gauge
set “1”
90890-06945
Pressure/vacuum tester “1”
YB-35956-B
Output voltage at -20.0 kPa (-0.20
kgf/cm², -2.9 psi)
0.79 V
Output voltage at -46.7 kPa (-0.47
kgf/cm², -6.8 psi)
1.84 V
Yellow/Green (Y/G)–Black (B)
B/Y
B
1
2
Or
Y/G
Resistance at 0 °C (32 °F)
5.4-6.6 kΩ
Resistance at 80 °C (176 °F)
0.28-0.38 kΩ
Black/Yellow (B/Y)–Black (B)
Input voltage
5 V
Black/Yellow (B/Y)–Black (B)
B B/Y
B B/Y
a