Yamaha Yzf R1 2007 Manual

IGNITION SYSTEM
8-2
1. Main switch
4. Main fuse
8. Battery
12.Starting circuit cut-off relay
13.Neutral switch
14.Sidestand switch
19.ECU (engine control unit)
20.Ignition coil #1
21.Ignition coil #2
22.Ignition coil #3
23.Ignition coil #4
24.Spark plug
35.Crankshaft position sensor
40.Lean angle sensor
58.Engine stop switch
64.Clutch switch
79.Ignition fuse
88.Ground
89.Battery negative lead 

IGNITION SYSTEM
8-3
EAS27150
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
 Before troubleshooting, remove the following part(s):
1Rider seat
2 Passenger seat
3 Fuel tank
4 Side cowlings
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓ 1 Check the fuses.
(Main and ignition)
Refer to CHECKING THE FUSES 
on page 8-85.Replace the fuse(s).
2 Check the battery.
Refer to CHECKING AND 
CHARGING THE BATTERY on 
page 8-85. Clean the battery terminals.
...

IGNITION SYSTEM
8-4
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓ 8 Check the engine stop switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the right handlebar switch.
9 Check the neutral switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the neutral switch.
10 Check the sidestand switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the sidestand switch.
11 Check the clutch switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the clutch switch.
12 Check the...

ELECTRIC STARTING SYSTEM
8-5
EAS27160
ELECTRIC STARTING SYSTEM
EAS27170
CIRCUIT DIAGRAM 

ELECTRIC STARTING SYSTEM
8-6
1. Main switch
4. Main fuse
8. Battery
10.Starter relay
11.Starter motor
12.Starting circuit cut-off relay
13.Neutral switch
14.Sidestand switch
58.Engine stop switch
59.Start switch
64.Clutch switch
79.Ignition fuse
88.Ground
89.Battery negative lead 

ELECTRIC STARTING SYSTEM
8-7
EAS27180
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...

ELECTRIC STARTING SYSTEM
8-8
a. WHEN THE TRANSMISSION IS IN NEU-
TRAL
b. WHEN THE SIDESTAND IS UP AND THE 
CLUTCH LEVER IS PULLED TO THE 
HANDLEBAR
1. Battery
2. Main fuse
3. Main switch
4. Ignition fuse
5. Engine stop switch
6. Starting circuit cut-off relay
7. Diode
8. Clutch switch
9. Sidestand switch
10.Neutral switch
11.Start switch
12.Starter relay
13.Starter motor
14.Battery negative lead
15.Ground 

ELECTRIC STARTING SYSTEM
8-9
EAS27190
TROUBLESHOOTING
The starter motor fails to turn.
NOTE:
 Before troubleshooting, remove the following part(s):
1Rider seat
2 Passenger seat
3 Fuel tank
4 Air filter case
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓ 1 Check the fuses.
(Main and ignition)
Refer to CHECKING THE FUSES 
on page 8-85.Replace the fuse(s).
2 Check the battery.
Refer to CHECKING AND 
CHARGING THE BATTERY on 
page 8-85. Clean the battery terminals.
 Recharge or replace the...

ELECTRIC STARTING SYSTEM
8-10
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓
NG→
OK↓ 8 Check the engine stop switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the right handlebar switch.
9 Check the neutral switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the neutral switch.
10 Check the sidestand switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the sidestand switch.
11 Check the clutch switch.
Refer to CHECKING THE 
SWITCHES on page 8-81.Replace the clutch switch.
12 Check...

CHARGING SYSTEM
8-11
EAS27200
CHARGING SYSTEM
EAS27210
CIRCUIT DIAGRAM