Checking The Thermoswitch - Yamaha 55DEHD Service Manual

Charge coil output peak voltage:
Red (R)–Blue (L)
Unloaded
r/min
Cranking
DC V 150 110
Charge coil output peak voltage:
Red (R)–Brown (Br)
Unloaded
r/min
Cranking
DC V 50 60
NOTE:
Remove the all spark plug caps, when mea-
suring the charge coil peak voltage at loaded
engine cranking.
4. Disconnect the charge coil coupler.
5. Connect the special service tool 1 and
digital circuit tester to the charge coil cou-
pler.
6. Measure the charge coil resistance.
Replace the stator assembly if out of
specification.
O
R
Charge coil resistance
(reference data):
Red (R)–Brown (Br)
48–72 Ω at 20°C (68°F)
Red (R)–Blue (L)
428–642 Ω at 20°C (68°F)
Throttle sensor adjusting lead 1:
90890-06857
6885J11
Loaded
1,500 3,500
150 160
Loaded
1,500 3,500
150 160
L
P
Br R
1
P
O
R
68880100
Ignition and ignition control system

Checking the thermoswitch

1. Remove the thermoswitch from cylinder
head.
NOTE:
To remove the thermoswitch, refer to page 5-
18.
2. Place the thermoswitch in a container of
water and slowly heat the water.
3. Check the switch for continuity at the
specified temperatures. Replace the ther-
moswitche if out of specification.
a Temperature
b Time
c No continuity
d Continuity
Thermoswitch continuity
temperature (reference data):
Pink (P)–Black (B)
e: 84–90 °C (183–194°F)
f: 60–74 °C (140–165°F)
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