Thermo Sensor Check; Engine Temperature Sensor Check - Yamaha Waverunner VXS VX1800 Service Manual

5. Check the thermo switch for continuity
when the specified temperatures are
reached. Replace if out of specification.
b
c
A
a
a. No continuity
b. Continuity
c. Continuity temperature
d. No continuity temperature
A. Temperature
B. Time
Continuity temperature
94–100 °C (201–212 °F)
No continuity temperature
80–94 °C (176–201 °F)
6. Install the thermo switch. See "Cylinder
block and electrical part" (5-67).
7. Connect the thermo switch coupler.

Thermo sensor check

1. Disconnect the thermo sensor coupler "a".
2. Supply power to the ECM, and then mea-
sure the input voltage at the thermo sensor
coupler terminals (wire harness end).
Check the wire harness if out of specifica-
tion.
B
P
b
b
d
a
B
Input voltage
4.75–5.25 V
Black/Blue (B/L)–Black/Orange (B/O)
3. Remove the thermo sensor. See "Muffler"
(5-16).
4. Suspend the thermo sensor in a container
filled with water, and then slowly heat the
water.
5. Measure the thermo sensor resistance
when the specified temperatures are
reached. Replace if out of specification.
Resistance at 0°C (32°F)
24.0–37.1 kΩ
Resistance at 100°C (212°F)
0.87–1.18 kΩ
6. Install the thermo sensor. See "Muffler"
(5-16).
7. Connect the thermo sensor coupler.

Engine temperature sensor check

1. Disconnect the engine temperature sensor
coupler "a".
7-16
Control system
a
B/L B/O
B
B