Yamaha Fz1n Service Manual

AIR INDUCTION SYSTEM
7-15
Out of specification → Replace the reed 
valve.
4. Check:  Air cut-off valveCracks/damage  → Replace.
5. Check
 Air induction system solenoid
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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 terminals as 
shown.
c. Measure the air induction system solenoid  resistance.
d. Out of specification  → Replace.
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8
ELECTRICAL SYSTEM
IGNITION SYSTEM....................................................................................... 8-1
CIRCUIT DIAGRAM................................................................................ 8-1
TROUBLESHOOTING ............................................................................ 8-3
ELECTRIC STARTING SYSTEM .................................................................. 8-5
CIRCUIT...

ELECTRICAL COMPONENTS................................................................... 8-89
CHECKING THE SWITCHES............................................................... 8-93
CHECKING THE BULBS AND BULB SOCKETS ................................. 8-96
CHECKING THE FUSES...................................................................... 8-97
CHECKING AND CHARGING THE BATTERY..................................... 8-97
CHECKING THE RELAYS...

IGNITION SYSTEM
8-1
EAS27090
IGNITION SYSTEM
EAS27110
CIRCUIT DIAGRAM 

IGNITION SYSTEM
8-2
1. Main switch
6. Fuse (main)
7. Battery
11.Relay unit
12.Starting circuit cut-off relay
14.Neutral switch
15.Sidestand switch
17.Crankshaft position sensor
21.Lean angle sensor
23.ECU
24.Ignition coil #1
25.Ignition coil #2
26.Ignition coil #3
27.Ignition coil #4
28.Spark plug
56.Engine stop switch
60.Clutch switch
78.Fuse (ignition) 

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):
1 Rider and passenger seat
2 Fuel tankNG→
OK ↓
NG→
OK ↓
NG→
OK ↓
OK→
NG ↓
NG→
NG ↓
NG→
OK ↓
NG→
OK ↓
1 Check the fuses.
(Main and ignition)
Refer to CHECKING THE FUSES 
on page 8-97. Replace the fuse(s).
2 Check the battery. Refer to CHECKING AND 
CHARGING THE BATTERY on 
page 8-97.  Clean the battery terminals.
 Recharge or...

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 8-93. Replace the right handlebar switch.
9 Check the neutral switch. Refer to CHECKING THE 
SWITCHES on page 8-93. Replace the neutral switch.
10 Check the sidestand switch. Refer to CHECKING THE 
SWITCHES on page 8-93. Replace the sidestand switch.
11 Check the clutch switch. Refer to CHECKING THE 
SWITCHES on page 8-93. Replace the clutch switch....

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

ELECTRIC STARTING SYSTEM
8-6
1. Main switch
6. Fuse (main)
7. Battery
9. Starter relay
10.Starter motor
11.Relay unit
12.Starting circuit cut-off relay
14.Neutral switch
15.Sidestand switch
56.Engine stop switch
57.Start switch
60.Clutch switch
78.Fuse (ignition)