Yamaha Fz6 N Service Manual

COOLING SYSTEM
8-28
1. Main switch
7. Main fuse
10.Battery
21.Coolant temperature sensor
22.ECU (engine control unit)
37.Multi-function meter
47.Radiator fan motor fuse
48.Radiator fan motor relay
49.Radiator fan motor
52.Ignition fuse 

COOLING SYSTEM
8-29
EAS27320
TROUBLESHOOTING
NOTE:
 Before troubleshooting, remove the following part(s):
1.Seat
2.Front cowling inner panel
3.Fuel tank
4.Side coverNG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
1. Check the fuses.
(Main, ignition and radiator fan 
motor)
Refer to CHECKING THE 
FUSES on page 8-113. Replace the fuse(s).
2. Check the battery. Refer to CHECKING AND 
CHARGING THE BATTERY on 
page 8-114.  Clean the battery terminals.
 Recharge or replace the battery.
3. Check the...

COOLING SYSTEM
8-30
NG→
OK ↓
7. Check the entire cooling system’s 
wiring.
Refer to CIRCUIT DIAGRAM on 
page 8-1. Properly connect or repair the cooling 
system’s wiring.
This circuit is OK. 

FUEL INJECTION SYSTEM
8-31
EAS27330
FUEL INJECTION SYSTEM
EAS27340
CIRCUIT DIAGRAM
ChB
P
G/L Y/L R/GLgB/W
G/L
Y/L
R/G
G/R
G/RLgB/W
R/B
R/LG/BR/LG/BR/LG/B
R/B R/L
G/B
R/B23R/L
R/L
R/LR/BR/L24
25
26
27
R/WBr/RR/W
Br/R
15L
Y
B/L
D
G/W
G/WD
Br/W Br/W D
P/W P/W D
B/L B/L
B/LBr/W
LB/LP/W
16
2021
B/LG/WB/L B/L
L
A
B/W A
Y/L D
YY
C
LL C
R/L
C G/B
C
R/B
B/L
22
R/L
B/L
G/WBr/WYP/WB/L
G/WBr/WYP/WB/L
18
L
L
P/W
P/W
R/B
R/L
G/B
L
B/Y
B/LY/GL
B/R
Y/B
W/Y B/L
B/L
L G/Y
R/B R/L
G/B L
B/L35
36 37
37
Y/L
19Gy
B
Gy B/L...

FUEL INJECTION SYSTEM
8-32
1. Main switch
3. Backup fuse
5. Fuel injection system fuse
7. Main fuse
10.Battery
11.Starting circuit cut-off relay
12.Sidestand switch
13.Neutral switch
14.Fuel pump
15.Throttle position sensor
16.Intake air pressure sensor
17.O
2 sensor
18.Lean angle sensor
19.Crankshaft position sensor
20.Intake air temperature sensor
21.Coolant temperature sensor
22.ECU (engine control unit)
23.Injector #1
24.Injector #2
25.Injector #3
26.Injector #4
30.ABS ECU
32.Rear wheel sensor...

FUEL INJECTION SYSTEM
8-33
EAS27350
ECU SELF-DIAGNOSTIC FUNCTION
The ECU is equipped with a self-diagnostic function in order to ensure that the fuel injection system 
is operating normally. If this function detects a malf unction in the system, it immediately operates the 
engine under substitute characteristics and illuminates the engine trouble warning light to alert the 
rider that a malfunction has occurred in the syst em. Once a malfunction has been detected, a fault 
code is stored in the memory...

FUEL INJECTION SYSTEM
8-34
EAS27362
FAIL-SAFE ACTIONS (SUBSTITUTE CHARACTERISTICS OPERATION CONTROL)
If the ECU detects an abnormal signal from a sensor while the vehicle is being driven, the ECU illu-
minates the engine trouble warning light and provi des the engine with alternate operating instruc-
tions that are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that 
are programmed for each sensor in order to provide the...

FUEL INJECTION SYSTEM
8-35
Communication error with the meter34
Ignition coil (#2, #3)
(faulty ignition) Malfunction detected in the pri-
mary wire of the ignition coil (#2, 
#3). Able
(depending 
on the num-
ber of faulty  cylinders) Able
(depending 
on the num-
ber of faulty  cylinders)
41 Lean angle sensor
(open or short circuit) Lean angle sensor-open or short 
circuit detected.
Unable Unable
42 Speed sensor
Neutral switch No normal signals are received 
from the speed sensor.
Open or short circuit...

FUEL INJECTION SYSTEM
8-36
EAS27400
TROUBLESHOOTING METHOD
The engine operation is not normal and the
engine trouble warning light comes on.
1. Check: Fault code number
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Check the fault code number displayed on  the meter.
b. Identify the system with the malfunction.  Refer to “Self-Diagnostic Function table”.
c. Identify the probable cause of malfunction. 
Refer to “Diagnostic monitoring code 
table”.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
2. Checking and repair the probable...

FUEL INJECTION SYSTEM
8-37
EAS27411
DIAGNOSTIC MODE
Setting the diagnostic mode
1. Turn the main switch to “OFF” and set the engine stop switch to “ ”.
2. Disconnect the wire harness coupler from the fuel pump.
3. Simultaneously press and hold the “SELECT” and “RESET” buttons, turn the main switch to 
“ON”, and continue to press the buttons for 8 seconds or more.
NOTE:
 All displays on the meter disappear except the clock and tripmeter displays.
 “dIAG” appears on the clock LCD.
4. Press the “SELECT”...