2004 YAMAHA YZF-R1S diagram

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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8-54
SELF-DIAGNOSISELEC
L/B B
Lg
B
BG/W
B R/L
Y/LY/BR/G
Sb/W
W
G/W
G/W
R/L
B
R/W
LgLgB
Sb/WSb/WA
Br BrA
R/G R/GBB/R B/RBY/B Y/BBY/L Y/LBG/W G/WA
GY
14
3839
40
41
42
43
44
45
Repair or replace the
wire harness.
NO
1. Wire harness

Check the wire harness for continuity.
Refer to “CIRCUIT DIAGRAM”.

Is the wire harness OK?
YES
NO
2. Fuel pump thermistor

Check the fuel pump thermistor for continuity.
Refer to “The fuel level warning light fails to
come on”.

Is the fuel pump thermistor OK?
YES
Replace the fuel
pump.Replace the multi-
function meter.
NOTE:
14Fuel pump
45Multi-function meter
TROUBLESHOOTING
The warning light starts to indicate the
self-diagnosis sequence.
Check:
1. fuel pump thermistor
2. oil level switch

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

Troubleshoot with the following special
tool(-s).
Pocket tester
90890-03112, YU-3112
1. Fuel pump thermistor
CIRCUIT DIAGRAM
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8-55
SELF-DIAGNOSISELEC
Replace the oil level
switch.
NO
2. Oil level switch

Check the oil level switch for continuity.
Refer to “The oil level warning light fails to
come on”.

Is the oil level switch OK?
YES
Repair or replace the
wire harness.
NO
1. Wire harness

Check the wire harness for continuity.
Refer to “CIRCUIT DIAGRAM”.

Is the wire harness OK?
YES
Replace the multi-
function meter.
B/WWW
Y/LY/BR/G
Sb/W
W
WG/W
R/WSb/WSb/WA
Br BrA
R/G R/GBB/R B/RBY/B Y/BBY/L Y/L
Dg
Ch
BG/W G/WA
B/W B/W
GY
B
40
41
42
43
44
45
46
47
48
49
50
51
52
45Multi-function meter
52Oil level switch
2. Oil level switch
CIRCUIT DIAGRAM
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