Yamaha YFM35FAS Supplementary Service Manual page 112

6.Fan motor relay
Remove the fan motor relay from the wire
G
harness.
Connect the pocket tester (Ω × 1) and the
G
battery (12 V) to the fan motor relay
terminals.
Tester (+) lead → Red/Black terminal 1
Tester (–) lead → Blue terminal 2
Battery (+) terminal →
Battery (–) terminal →
White/Yellow terminal 4
Check the fan motor relay for continuity.
G
7.Thermo unit
Remove the thermo
G
crankcase.
Connect the pocket tester (Ω × 100) to the
G
thermo unit 1.
Immerse the thermo unit in engine oil 2.
G
Measure the resistance.
G
Thermo unit resistance:
150 °C (302 °F): 307 ~ 339 Ω
170 °C (338 °F): 209 ~ 231 Ω
WARNING
Handle the thermo unit with special care.
Never subject it to a strong shock or allow
it to be dropped. Should it be dropped, it
must be replaced.
Thermo unit:
20 Nm (2.0 m • kg, 14 ft • lb)
*
C0NTINUITY
Red/White terminal 3
CONTINUITY
unit from
GOOD
CONDITION
*
COOLING SYSTEM
2
1
NO CONTINUITY
Replace the fan motor relay.
the
BAD CONDITION
Replace the thermo unit.
– 102 –
– +
ELEC
4
W/Y L
R/W R/B
3