Engine Temperature Sensor - Yamaha WaveRunner FX SHO Service Manual

– +
ELEC
1
Control system
B/O B/Y
B/Y B/Y

Engine temperature sensor

1. Measure:
• Engine temperature sensor input
voltage
Out of specification → Check the wiring
harness.
Measurement steps:
1. Disconnect the engine temperature sensor
coupler 1.
2. Push the unlock button, and then measure
the input voltage at the engine tempera-
ture sensor coupler terminals (wiring har-
ness end).
Engine temperature sensor input
voltage (reference data):
Black/yellow (B/Y) –
Black/orange (B/O)
4.75–5.25 V
2. Measure:
• Engine temperature sensor resistance
(at the specified temperatures)
Out of specification → Replace the
engine temperature sensor.
Measurement steps:
1. Remove the engine temperature sensor.
Refer to "Oil separator tank and oil pan
removal" in Chapter 5.
2. Suspend the engine temperature sensor in
a container filled with water.
3. Slowly heat the water.
7-23
E