Yamaha R1 2004 ServiceManual

8-38
SIGNALING SYSTEMELEC
NO
YESNO
The wiring circuit
from the main switch
to the tail / brake light
coupler is faulty and
must be repaired.
This circuit is OK.
YES 1. Turn signal indicator light (LEDs)

Check the turn signal indicator light for conti-
nuity.
Refer to “CHECKING THE LEDs”.

Are the turn signal indicator light OK?
Replace the meter
assembly.
EAS00799
3. The turn signal / position light, turn signal in-
dicator light or both fail to blink.
YES
2. Turn signal switch

Check the turn signal...

8-39
SIGNALING SYSTEMELEC
C
YESNO
The wiring circuit
from the turn signal
switch to the turn sig-
nal light connector is
faulty and must be
repaired. Left turn signal / position light
Positive tester probe 
  chocolate
Negative tester probe 
 ground
Right turn signal / position light
Positive tester probe 
 dark green
Negative tester probe 
  ground
1
2

Turn the main switch to “ON”.

Set the turn signal switch to “ ” or “ ”.

Measure the voltage (DC 12 V) of the choco-
late   or dark green   at the turn...

8-40
SIGNALING SYSTEMELEC
YESNO
Replace the starting
circuit cut-off relay.
YESNO 4. Voltage

Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness side)
as shown.
The wiring circuit
from the main switch
to the meter assem-
bly coupler is faulty
and must be re-
paired. Positive tester probe 
 brown 
Negative tester probe 
 ground
1

Turn the main switch to “ON”.

Measure the voltage (DC 12 V) of brown 
at the meter assembly coupler (wire harness
side).

Is the voltage within...

8-41
SIGNALING SYSTEMELEC
3. Voltage

Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness side)
as shown.
Positive tester probe 
 black / red
Negative tester probe 
 black / white
1
2

Turn the main switch to “ON”.

Measure the voltage (DC 12V) of black /
red   and black / white   at the meter as-
sembly coupler.

Is the voltage within specification?
12
YESNO
The wiring circuit
from the main switch
to the meter assem-
bly is faulty and must
be repaired.
This circuit is OK....

8-42
SIGNALING SYSTEMELEC
YESNO 2. Voltage

Connect the pocket tester (DC 20 V) to the
meter assembly coupler (wire harness side)
as shown.
The wiring circuit
from the main switch
to the meter assem-
bly coupler is faulty
and must be re-
paired. Positive tester probe 
 green / white 
Negative tester probe 
 black / white
1
2

Turn the main switch to “ON”.

Measure the voltage (DC 12 V) of
green / white   and black / white   at the
meter assembly coupler.

Is the voltage within specification?
This circuit...

8-43
COOLING SYSTEMELEC
EAS00807
COOLING SYSTEM
CIRCUIT DIAGRAM 

8-44
1Main switch
4Fuse (main)
6Battery
14E.C.U.
28Coolant temperature sensor
73Fuse (ignition)
76Radiator fan motor relay
77Fuse (radiator fan motor left)
78Fuse (radiator fan motor right)
79Radiator fan motor 2
80Radiator fan motor 1
COOLING SYSTEMELEC 

8-45
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”.

Is the main switch OK?
YESNO
Replace the main
switch.
COOLING SYSTEMELEC
NOTE:
YESNO
1. Main, ignition and radiator fan motor fuses

Check...

8-46
YESNO
4. Radiator fan motor

Disconnect the radiator fan motor coupler
from the wire harness.

Connect the battery (DC 12 V) as shown.
The radiator fan mo-
tor is faulty and must
be replaced.
Positive battery lead 
 blue
Negative battery lead 
 black1
2

Does the radiator fan motor turn?
5. Radiator fan motor relay

Disconnect the radiator fan motor relay
form the wire harness.

Connect the pocket tester (Ω 
 1) and bat-
tery (12 V) to the radiator fan motor terminal
as shown.

Check the radiator...

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...