Yamaha R1 2004 ServiceManual

7-47
AIR INDUCTION SYSTEMFI
A To cylinder #1 and #2
B To cylinder #3 and #41 Air cut-off valve
2 Plate
3 Reed valve assembly
4 Reed valve cap
5 To air filter case
EAS00509
AIR INDUCTION SYSTEM DIAGRAMS 

7-48
AIR INDUCTION SYSTEMFI
EAS00510
CHECKING THE AIR INDUCTION SYSTEM
1. Check:

hoses
Loose connection 
 Connect properly.
Cracks / damage 
 Replace.

pipes
Cracks / damage 
 Replace.
2. Check:

 reed valve 
1

 reed valve stopper

reed valve seat
Cracks / damage 
 Replace the reed valve.
3. Measure:

 reed valve bending limit 
a
Out of specification 
 Replace the reed
valve.
Reed valve bending limit
0.4 mm (0.016 in)
1Surface plate
4. Check:

air cut-off valve
Cracks / damage 
 Replace. 

7-49
AIR INDUCTION SYSTEMFI
5. Check:

Air induction system solenoid
a. Remove the Air induction system solenoid
coupler from the wire harness.
b. Connect the pocket tester (Ω  1) to the Air
induction system solenoid terminal as
shown.
Tester positive probe 
 orange 
1
Tester negative probe 
 green 2
c. Measure the Air induction system solenoid
resistance.
Air induction system solenoid
resistance
18 
 22 Ω at 20C (68F)
d. Out of specification 
 Replace. 

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 

8-2
9Radiator fan motor relay
10Turn signal relay
11Rectifier / regulator
12Throttle position sensor
13Sub-throttle position sensor
1Coolant temperature sensor
2Intake air temperature sensor
3Intake air pressure sensor
4Fuel pump
5ECU
6Lean angle cut-off switch
7Starting circuit cut-off relay
8Headlight relay (dimmer)
ELECTRICAL COMPONENTSELEC 

8-3
CHECKING SWITCH CONTINUITYELEC
CAUTION:
NOTE:
NOTE:
EAS00730
CHECKING SWITCH CONTINUITY
Check each switch for continuity with the pocket
tester. If the continuity reading is incorrect,
check the wiring connections and if necessary,
replace the switch.
Never insert the tester probes into the cou-
pler terminal slots. Always insert the probes
from the opposite end of the coupler 
1 tak-
ing care not to loosen or damage the leads.
Pocket tester
90890-03112, YU-3112

Before checking for continuity, set...

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...

8-5
CHECKING THE BULBS AND BULB SOCKETSELEC
WARNING
EAS00732
CHECKING THE BULBS AND
BULB SOCKETS
Check each bulb and bulb socket for damage or
wear, proper connections, and also for continu-
ity between the terminals.
Damage / wear 
 Repair or replace the bulb,
bulb socket or both.
Improperly connected 
 Properly connect.
No continuity 
 Repair or replace the bulb, bulb
socket or both.
TYPES OF BULBS
The bulbs used on this motorcycle are shown in
the illustration on the left.

Bulbs 
A and B are used for...

8-6
CHECKING THE BULBS AND BULB SOCKETSELEC
CAUTION:
NOTE:

Be sure to hold the socket firmly when re-
moving the bulb. Never pull the lead, other-
wise it may be pulled out of the terminal in
the coupler.

Avoid touching the glass part of the head-
light bulb to keep it free from oil, otherwise
the transparency of the glass, the life of the
bulb, and the luminous flux will be adverse-
ly affected. If the headlight bulb gets soiled,
thoroughly clean it with a cloth moistened
with alcohol or lacquer...

8-7
CHECKING THE BULBS AND BULB SOCKETSELEC
NOTE:
NOTE:
WARNING
Pocket tester
90890-03112, YU-3112
Check each bulb socket for continuity in the
same manner as described in the bulb section;
however, note the following.
a. Install a good bulb into the bulb socket.
b. Connect the pocket tester probes to the re-
spective leads of the bulb socket.
c. Check the bulb socket for continuity. If any of
the readings indicate no continuity, replace
the bulb socket.
CHECKING THE LEDs
The following procedures applies...