diagram YAMAHA YZF-R1SC 2004 Owner's Manual

8-24
2A.C. magneto
3Rectifier / regulator
4Fuse (main)
6Battery
CHARGING SYSTEMELEC
EAS00773
CHARGING SYSTEM
CIRCUIT DIAGRAM
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8-26
CHARGING SYSTEMELEC
YESNO 5. Stator coil resistance

Remove the generator cover.

Connect the pocket tester (Ω
1) to the sta-
tor coils as shown.
Replace the stator
coil assembly.
EAS00776
Positive tester probe
white
Negative tester probe
white
Positive tester probe
white
Negative tester probe
white1
1
2
3

Measure the stator coil resistances.
Stator coil resistance
0.14  0.18 Ω at 20C (68F)

Is the stator coil OK?
YESNO 6. Wiring

Check the wiring connections of the entire
charging system.
Refer to “CIRCUIT DIAGRAM”.

Is the charging system’s wiring properly con-
nected and without defects?
Properly connect or
repair the charging
system’s wiring.
EAS00779
Replace the rectifi-
er / regulator.
4. Stator coil lead

Disconnect stator coil lead coupler.

Connect the pocket tester (Ω
1) to the sta-
tor coil lead coupler as shown.
Positive tester probe

white
Negative tester probe

ground
3
Positive tester probe

white
Negative tester probe

ground
1
Positive tester probe

white
Negative tester probe

groundNo
continuity
2
YESNO
Replace the stator
coil lead.
Are the tester readings correct?
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8-27
LIGHTING SYSTEMELEC
EAS00780
LIGHTING SYSTEM
CIRCUIT DIAGRAM
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8-30

Does the Headlight relay (dimmer) have
continuity between red / yellow and
black / green ?
NOYES
Replace the dimmer
relay. Positive tester probe
red / yellow
Negative tester probe
black / green
1
2
3
4
5. Headlight relay (on / off)

Disconnect the headlight relay (on / off) from
the coupler.

Connect the pocket tester (Ω
1) and bat-
tery (12 V) to the headlight relay (on / off) as
shown.
Positive battery lead
red / yellow
Negative battery lead
yellow / black
EAS00787
YESNO 7. Wiring

Check the entire lighting system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Is the lighting system’s wiring properly con-
nected and without defects?
Properly connect or
repair the lighting
system’s wiring.
Check the condition
of each of the lighting
system’s circuits.
Refer to “CHECK-
ING THE LIGHTING
SYSTEM”.

Does the headlight relay (dimmer) have
continuity between black / green and
black / yellow ?
Positive tester probe
black / green
Negative tester probe
black / yellow
1
2
3
4
6. Headlight relay (dimmer)

Disconnect the headlight relay (dimmer)
from the coupler.

Connect the pocket tester (Ω
1) and bat-
tery (12 V) to the headlight relay (dimmer) as
shown.
Positive battery lead
black
Negative battery lead
yellow
3
4
3
4
YESNO
Replace the head-
light relay (dimmer).
LIGHTING SYSTEMELEC
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8-34
SIGNALING SYSTEMELEC
EAS00793
SIGNALING SYSTEM
CIRCUIT DIAGRAM
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8-36
YESNO

Clean the battery
terminals.

Recharge or re-
place the battery.
EAS00749
3. Main switch

Check the main switch for continuity.
Refer to “CHECKING THE SWITCHES”.

Is the main switch OK?
YESNO
Replace the main
switch.
YESNO 1. Horn switch

Check the horn switch for continuity.
Refer to “CHECKING THE SWITCHES”.

Is the horn switch OK?
Replace the left han-
dlebar switch.
EAS00796
CHECKING THE SIGNALING SYSTEM
1. The horn fails to sound.
EAS00795
4. Wiring

Check the entire signaling system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Is the signaling system’s wiring properly
connected and without defects?
YESNO
Properly connect or
repair the signaling
system’s wiring.
Check the condition
of each of the signal-
ing system’s circuits.
Refer to “CHECK-
ING THE LIGHTING
SYSTEM”.
SIGNALING SYSTEMELEC
NOTE:
YESNO
1. Backup, main, ignition, signal and park
fuses

Check the backup, main, ignition, signal and
park fuses for continuity.
Refer to “CHECKING THE FUSES” in chap-
ter 3.

Are the backup, main, ignition, signal and
park fuses OK?
Replace the fuse(s).
2. Battery

Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20C (68F)

Is the battery OK?
EAS00739EAS00794
TROUBLESHOOTING

Any of the following fail to light: turn sig-
nal light, brake light or an indicator light.

The horn fails to sound.
Check:
1. backup, main, ignition, signal, and park
fuses
2. battery
3. main switch
4. wiring connections
(of the entire signaling system)

Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank
3. side cowlings

Troubleshoot with the following special tool(s).
Pocket tester
90890-03112, YU-3112
EAS00738
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8-43
COOLING SYSTEMELEC
EAS00807
COOLING SYSTEM
CIRCUIT DIAGRAM
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8-47
COOLING SYSTEMELEC

Remove the coolant temperature sensor.

Connect the pocket tester (Ω
1k) to the
coolant temperature sensor as shown.

Immerse the coolant temperature sensor in
a container filled with coolant .
Make sure the coolant temperature sensor
terminals do not get wet.

Place a thermometer in the coolant.

Slowly heat the coolant, and then let it cool to
the specified temperature indicated in the
table.

Check the coolant temperature sensor for
continuity at the temperatures indicated in
the table.
EAS00812
1
Coolant temperature sensor
resistance
0C (32F): 5.21  6.37 kΩ
80C (176F): 0.29  0.35 kΩ
WARNING

Handle the coolant temperature sensor
with special care.

Never subject the coolant temperature
sensor to strong shocks. If the coolant
temperature sensor is dropped, replace
it.
6. Coolant temperature sensor
Replace the coolant
temperature sensor.
NOYES
Coolant temperature sensor
20 Nm (2.0 m
kg, 14 ft
lb)
Three bond sealock
10

Does the coolant temperature sensor oper-
ate properly?
7. Wiring

Check the entire cooling system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Is the cooling system’s wiring properly con-
nected and without defects?
Properly connect or
repair the cooling
system’s wiring.
NOYES
This circuit is OK.
EAS00813
2
NOTE:
3
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8-48
1Main switch
4Fuse (main)
6Battery
7Fuse (fuel injection)
10Starting circuit cut-off relay
13Fuel pump
14E.C.U.
53Engine stop switch
FUEL PUMP SYSTEMELEC
EAS00814
FUEL PUMP SYSTEM
CIRCUIT DIAGRAM
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8-51
FUEL PUMP SYSTEMELEC
YESNO 5. Starting circuit cut-off relay (fuel injection
system relay)

Disconnect the starting circuit cut-off relay
coupler from the wire harness.

Connect the pocket tester (Ω
1) and bat-
tery (12 V) to the starting circuit cut-off relay
coupler as shown.
Replace the starting
circuit cut-off relay.
Positive battery lead
red / black
Negative battery lead
blue / yellow 1
2
Positive tester probe
red
Negative tester probe
red / blue3
4

Does the starting circuit cut-off relay have
continuity between red and red / blue?
YESNO 6. Fuel pump resistance

Disconnect the fuel pump coupler from the
wire harness.

Connect the pocket tester (Ω
1) to the fuel
pump coupler as shown.
Properly connect or
repair the fuel sys-
tem’s wiring.
1
2
Positive tester probe
red / blue
Negative tester probe
black
EAS00817
YESNO Fuel pump resistance
0.2  3.0 Ω at 20C (68F)

Is the fuel pump OK?
Replace the fuel
pump.

Measure the fuel pump resistance.
7. Wiring

Check the entire fuel pump system’s wiring.
Refer to “CIRCUIT DIAGRAM”.

Is the fuel system’s wiring properly con-
nected and without defects?
EAS00818
Replace the ECU.
EAS00759
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