2004 YAMAHA YZF-R1S fuse

7-3
FUEL INJECTION SYSTEMFI
1Main switch
4Fuse (main)
5Fuse (backup)
6Battery
7Fuse (fuel injection)
10Starting circuit cut-off relay
11Neutral switch
12Sidestand switch
13Fuel pump
14E.C.U.
15Ignition coil #1
16Ignition coil #2
17Ignition coil #3
18Ignition coil #4
19Spark plug
20Injector #1
21Injector #2
22Injector #3
23Injector #4
25Sub-throttle position sensor
26EXUP servo motor
27Speed sensor
28Coolant temperature sensor
29Intake air temperature sensor
31Crankshaft position sensor
32Throttle position sensor
33Intake air pressure sensor
34Atmospheric pressure sensor
35Cylinder identification sensor
36Lean angle cut-off switch
43Multi function meter
53Engine stop switch
73Fuse (ignition)
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7-31
FUEL INJECTION SYSTEMFI
Fault code No.44SymptomError is detected while reading or writing on EEP-ROM
(CO adjustment value).
Used diagnostic No. 60 (EEP-ROM improper cylinder indication)
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Malfunction in ECUExecute diagnostic code 60
1. Check the faulty cylinder. (If there are multiple
cylinders, the number of the faulty cylinders
appear alternately at 2-second intervals.)
2. Readjust the CO of the displayed cylinder.
Refer to “ADJUSTING THE EXHAUST GAS
VALUME” in chapter 3.
Replace ECU if defective.Reinstated by
turning the
main switch
ON.
Fault code No.46SymptomPower supply to the FI system relay is not normal.
Used diagnostic code No. – –
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.If there is a malfunction, repair it and connect it
securely.
ECU coupler.Reinstated by
starting the
engine and
operating it at
idle.
2Faulty batteryReplace or change the battery
Refer to “CHECKING AND CHARGING THE
BATTERY” in chapter 3.
3The malfunction of the rectifier / regula-
tor.Replace if defective.
Refer to “CHARGING SYSTEM” in chapter 8.
4Open or short circuit in wiring harness.Repair or replace if there is an open or short
circuit.

Between battery and main switch
red – red

Between main switch and fuse (ignition)
brown/blue – brown/blue

Between fuse (ignition) and ECU
red/white – red/white
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8-1
8
ELECTRICAL COMPONENTSELEC
9Oil level switch
10Radiator fan motor
11Horn
12Ignition coil
1Main switch
2Front brake light switch
3Starter relay
4Battery
5Fuse box
6Rear brake light switch
7Neutral switch
8Sidestand switch
EAS00729
ELECTRICAL SYSTEM
ELECTRICAL COMPONENTS
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8-4
11Neutral switch
12Rear brake light switch
13Fuse box
1Main switch
2Horn switch
3Dimmer switch
4Turn signal switch
5Clutch switch
6Sidestand switch
7Engine stop switch
8Front brake light switch
9Start switch
10Oil level switch
CHECKING THE SWITCHESELEC
EAS00731
CHECKING THE SWITCHES
Check each switch for damage or wear, proper connections, and also for continuity between the termi-
nals. Refer to “CHECKING SWITCH CONTINUITY”.
Damage / wear
Repair or replace.
Improperly connected
Properly connect.
Incorrect continuity reading
Replace the switch.
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8-9
IGNITION SYSTEMELEC
1Main switch
4Fuse (main)
6Battery
10Starting circuit cut-off relay
11Neutral switch
12Sidestand switch
14E.C.U.
15Ignition coil #1
16Ignition coil #2
17Ignition coil #3
18Ignition coil #4
19Spark plug
31Crankshaft position sensor
35Cylinder identification sensor
36Lean angle cut-off switch
53Engine stop switch
59Clutch switch
73Fuse (ignition)
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8-10
YESNO 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?

Clean the battery
terminals.

Recharge or re-
place the battery.
EAS00739
YESNO
EAS00741
3. Spark plugs
The following procedure applies to all of the
spark plugs.

Check the condition of the spark plug.

Check the spark plug type.

Measure the spark plug gap.
Refer to “CHECKING THE SPARK PLUGS”
in chapter 3.
Standard spark plug
CR9EK (NGK)
Spark plug gap
0.6  0.7 mm (0.0236  0.0276 in)

Is the spark plug in good condition, is it of the
correct type, and is its gap within specifica-
tion?
Re-gap or replace
the spark plug.
IGNITION SYSTEMELEC
NOTE:
YESNO
1. Main and ignition fuses

Check the main and ignition fuses for conti-
nuity.
Refer to “CHECKING THE FUSES” in chap-
ter 3.

Are the main and ignition fuses OK?
Replace the fuse(s).
EAS00737
TROUBLESHOOTING
The ignition system fails to operate (no
spark or intermittent spark).
Check:
1. main and ignition fuses
2. battery
3. spark plugs
4. ignition spark gap
5. ignition coil resistance
6. crankshaft position sensor
7. main switch
8. engine stop switch
9. neutral switch
10. sidestand switch
11. clutch switch
12. starting circuit cut-off relay (diode)
13. lean angle cut-off switch
14. wiring connections
(of the entire ignition system)

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

Troubleshoot with the following special tool(s).
Ignition checker
90890-06754
Dynamic spark tester
YM-34487
Pocket tester
90890-03112, YU-3112
EAS00738
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8-14
1Main switch
4Fuse (main)
6Battery
8Starter relay
9Starter motor
10Starting circuit cut-off relay
11Neutral switch
12Sidestand switch
53Engine stop switch
54Start switch
73Fuse (ignition)
ELECTRIC STARTING SYSTEMELEC
EAS00755
ELECTRIC STARTING SYSTEM
CIRCUIT DIAGRAM
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8-15
ELECTRIC STARTING SYSTEMELEC
EAS00756
STARTING CIRCUIT CUT-OFF SYSTEM
OPERATION
If the engine stop switch is set to “
” and the
main switch is set to “ON” (both switches are
closed), the starter motor can only operate if at
least one of the following conditions is met:

The transmission is in neutral (the neutral
switch is closed).

The clutch lever is pulled to the handlebar (the
clutch switch is closed) and the sidestand is up
(the sidestand switch is closed).
The starting circuit cut-off relay prevents the
starter motor from operating when neither of
these conditions has been met. In this instance,
the starting circuit cut-off relay is open so cur-
rent cannot reach the starter motor. When at
least one of the above conditions has been met
the starting circuit cut-off relay is closed and the
engine can be started by pressing the starter
switch.
WHEN THE TRANSMISSION IS IN
NEUTRAL
WHEN THE SIDESTAND IS UP AND
THE CLUTCH LEVER IS PULLED TO
THE HANDLEBAR
1Battery
2Main fuse
3Main switch
4Ignition fuse
5Engine stop switch
6Starting circuit cut-off relay
7Diode
8Clutch switch
9Sidestand switch
10Neutral switch
11Start switch
12Starter relay
13Starter motor
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