Yamaha YP125R, Service Manual

Page: 487 / 498

ELECTRICAL COMPONENTS
8-90
b. Immerse the air temperature sensor “1” in a
container filled with water “2”.
TIP
Make sure that the air temperature sensor termi-
nals do not get wet.
c. Place a thermometer “3” in the water.
d. Heat the water or let it cool down to the spec-
ified temperatures.
e. Measure the air temperature sensor resis-
tance.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
EAS37P1085
CHECKING THE ISC (IDLE SPEED
CONTROL) UNIT
TIP
Do not remove the ISC unit completely from the
throttle body.
1. Check:
• ISC unit
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Disconnect the ISC unit coupler from the ISC
unit.
b. Connect the pocket tester (
Ω ×
10) to the ter-
minals of the ISC unit.
c. Measure the ISC unit resistance.
Out of specification
→
Replace the throttle
body.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
EAS37P1084
CHECKING THE V-BELT REPLACEMENT
INDICATOR RESET COUPLER
1. Remove:
• V-belt replacement indicator reset coupler
2. Check:
• V-belt replacement indicator reset coupler
Out of specification
→
Replace the V-belt re-
placement indicator coupler.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
→
pink “1”
• Negative tester probe
→
light green “2”
3
1
2
• Positive tester probe
→
green “3”
• Negative tester probe
→
sky blue “4”
ISC unit resistance
27–33
Ω
at 20 °C (68 °F)
Continuity
Positive tester probe
→
black
“1”
Negative tester probe
→
black
“2”
Continuity
Positive tester probe
→
black
“2”
Negative tester probe
→
black
“1”
Lg
P
Sb
G
1 3
2 4
B B
1 2