Yamaha YFM350FAS, Supplementary Service Manual

Page: 108 / 119

– 98 –
– +
ELEC
SIGNAL SYSTEM
C0NTINUITY
4.Diode
●
Remove the diode from the coupler.
●
Connect the pocket tester (
Ω ×
1) to the
diode terminals as shown.
●
Check the diode for continuity as follows.
*
CORRECT
Tester (+) lead
→
Blue/Black terminal
1
Tester (–) lead
→
White/Blue terminal
2
Continuity
Tester (+) lead
→
White/Blue terminal
2
Tester (–) lead
→
Blue/Black terminal
1
No
continuity
NOTE:
When you switch the tester’s positive and
negative probes, the readings in the left chart
will be reversed.
INCORRECT
Replace the diode.
GOOD
CONDITION
5.Thermo unit
●
Remove the thermo unit from the
crankcase.
●
Connect the pocket tester (
Ω ×
100) to the
thermo unit
1
.
●
Immerse the thermo unit in engine oil
2
.
●
Measure the resistance.
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.
T
R
.
.
Thermo unit:
20 Nm (2.0 m • kg, 14 ft • lb)
Replace the CDI unit.
BAD CONDITION
Replace the thermo unit.