Yamaha YZF-R15, Service Manual

Page: 327 / 338

8-69
ELECTRICAL COMPONENTS
e. Measure the lean angle sensor output volt-
age.
CHECKING THE STARTER MOTOR
OPERATION
1. Check:
• Starter motor operation
Does not operate → Perform the electric
starting system troubleshooting, starting with
step 4.
Refer to “TROUBLESHOOTING” on page
8-9.
a. Connect the positive battery terminal “1” and
starter motor lead “2” with a jumper lead “3”.
WARNING
• A wire that is used as a jumper lead must
have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn.
• This check is likely to produce sparks,
therefore, make sure no flammable gas or
fluid is in the vicinity.
b. Check the starter motor operation.
CHECKING THE STATOR COIL
1. Disconnect:
• Stator coil coupler
(from the wire harness)
2. Check:
• Stator coil resistance
Out of specification → Replace the crank-
shaft position sensor/stator assembly.
a. Connect the multimeter Ω ×1) to the stator
coil coupler as shown.
b. Measure the stator coil resistance.
1. Check:
• Charging voltage
Out of specification → Replace the rectifi-
er/regulator.
a. Set the engine tachometer to the spark plug
lead.
b. Connect the multimeter to the
regulator coupler as shown.
Stator coil resistance
0.448–0.672 Ω at 20 °C (68 °F)
• Positive tester probe →
white “1”
• Negative tester probe →
white “2”
• Positive tester probe →
white “1”
• Negative tester probe →
white “3”
• Positive tester probe →
white “2”
• Negative tester probe →
white “3”
Charging voltage
14 V at 5000 r/min
W W
W
ssssssssssssssssssssssssssss
ssssssssssssssssssssssssssss
ssssssssssssssssssssssssssss
ssssssssssssssssssssssssssss
ssssssssssssssssssssssssssss
ssssssssssssssssssssssssssss
rectifier/
Multimeter
Multimeter
8-70
ELECTRICAL COMPONENTS
ssssssssssssssssssssssssssss
ssssssssssssssssssssssssssss
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the charging voltage.
CHECKING THE HORN
1. Check:
• Horn resistance
Out of specification → Replace.
a. Disconnect the horn connectors from the
horn terminals.
b. Connect the multimeter ( Ω × 1) to the horn
terminals.
c. Measure the horn resistance.
2. Check:
• Horn sound
Faulty sound → Adjust or replace.
a. Connect a battery (12 V) to the horn.
b. Turn the adjusting screw in direction “a” or “b”
until the specified horn sound is obtained.
CHECKING THE FUEL SENDER
1. Disconnect:
• Fuel pump assembly coupler
(from the wire harness)
2. Remove:
• Fuel tank
3. Remove:
• Fuel pump assembly
(from the fuel tank)
4. Check:
• Fuel sender resistance
Out of specification → Replace the fuel pump
assembly.
a. Connect the multimeter ( Ω × 100) to the
fuel sender coupler as shown.
• Positive tester probe →
red “1”
• Negative tester probe →
black “2”
Coil resistance
4.30–4.80 Ω at 20 °C
• Positive tester probe →
horn terminal “1”
• Negative tester probe →
horn terminal “2”
B R
W W W
1 2
1
2
Fuel sender
Sender unit resistance (full)
4.0–10.0 Ω at 20 °C (68 °F)
Sender unit resistance (empty)
90.0–100.0 Ω at 20 °C (68 °F)
• Positive tester probe →
green “1”
• Negative tester probe →
black “2”
b a
ssssssssssssssssssssssssssss
ssssssssssssssssssssssssssss
Multimeter
Multimeter