Yamaha WaveRunner FX Cruiser SHO, Service Manual

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7-22
Thermo sensor
1. Measure:
• Thermo sensor input voltage
Out of specification
→
Check the wiring
harness.
Measurement steps:
1. Disconnect the thermo sensor coupler
1
.
2. Push the unlock button, and then measure
the input voltage at the thermo sensor cou-
pler terminals (wiring harness end).
Thermo sensor input voltage
(reference data):
Black/blue (B/L) –
Black/orange (B/O)
4.75 – 5.25 V
1
B/O B/L
2. Measure:
• Thermo sensor resistance (at the speci-
fied temperatures)
Out of specification
→
Replace the
thermo sensor.
Measurement steps:
1. Remove the thermo sensor.
Refer to “ Muffler disassembly ” in Chapter
5.
2. Suspend the thermo sensor in a container
filled with water.
3. Slowly heat the water.
4. Measure the resistance when the specified
temperatures are reached.
Thermo sensor resistance (reference
data):
Black (B) – Black (B)
0 ° C (32 ° F): 24.0 – 37.1 k
Ω
100 ° C (212 ° F): 0.87 – 1.18 k
Ω
B
B
Control system