Yamaha R1 2004 ServiceManual

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 

8-49
FUEL PUMP SYSTEMELEC
1Battery
2Fuse (main)
3Main switch
4Fuse (ignition)
5Engine stop switch
6ECU
7Fuse (fuel injection)
8Starting circuit cut-off relay (fuel injection
system relay)
9Fuel pump
EAS00815
FUEL PUMP SYSTEM
The ECU includes the control unit for the
fuel pump. 

8-50
FUEL PUMP SYSTEMELEC
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
EAS00749
3. Main switch

Check the main switch for continuity.
Refer to “CHECKING THE SWITCHES”.
YESNO
Replace the main
switch. 
Is the main switch OK?
EAS00750
4. Engine stop switch

Check the engine stop switch for...

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...

8-52
FUEL PUMP SYSTEMELEC
WARNING
EAS00819
CHECKING THE FUEL PUMP
Gasoline is extremely flammable and under
certain circumstances there can be a danger
of an explosion or fire. Be extremely careful
and note the following points:

Stop the engine before refueling.

Do not smoke, and keep away from open
flames, sparks, or any other source of fire.

If you do accidentally spill gasoline, wipe it
up immediately with dry rags.

If gasoline touches the engine when it is
hot, a fire may occur. Therefore, make...

8-53
SELF-DIAGNOSISELEC
SELF-DIAGNOSIS
The YZF-R1(S) features a self-diagnosing system for the following circuit(-s):

Fuel pump thermistor

Oil level switch
If any of these circuits are defective, their respective condition codes will be displayed on the warning
light when the main switch is turned “ON” (irrespective of whether the engine is running or not).
Circuit
Defect(-s)System responseCondition code
Fuel pump
thermistor
Open-circuit

Short-circuit
The fuel level warning light indi-
cate the...

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...

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...

9-1
STARTING FAILURES
TRBL
SHTG
NOTE:
FUEL SYSTEM
Fuel tank
Empty fuel tank

 Clogged fuel filter

 Clogged fuel strainer

 Clogged fuel tank drain hose

 Deteriorated or contaminated fuel
Fuel pump 
Faulty fuel pump

 Faulty fuel pump relay
Throttle body (-ies)

Deteriorated or contaminated fuel

 Sucked-in air
Ignition coil(s) 
Cracked or broken ignition coil body

 Broken or shorted primary or secondary
coils
Ignition system 
Faulty ECU

 Faulty crankshaft position sensor
EAS00844
TROUBLESHOOTING
The...

9-2
9
Starting system
Faulty starter motor

 Faulty starter relay

 Faulty starting circuit cut-off relay

 Faulty starter clutch
STARTING FAILURES / INCORRECT ENGINE IDLING SPEED /
POOR MEDIUM-AND-HIGH-SPEED PERFORMANCETRBL
SHTG
ELECTRICAL SYSTEMS
Battery

Discharged battery

 Faulty battery
Spark plug(s) 
Incorrect spark plug gap

 Incorrect spark plug heat range

 Fouled spark plug

 Worn or damaged electrode

 Worn or damaged insulator
Ignition coil(s)

Broken or shorted primary or secondary
coils

...