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 main switch. Refer to CHECKING THE 
SWITCHES on page 8-109. Replace the main switch.
4. Check the radiator fan motor. Refer to CHECKING THE RADI-
ATOR FAN MOTOR on page 8-
127. The radiator fan motor is faulty and 
must be replaced.
5. Check the radiator fan motor relay. Refer to CHECKING THE 
RELAYS on page 8-117. Replace the radiator fan motor relay.
6. Check the coolant temperature. Refer to CHECKING THE COOL-
ANT TEMPERATURE SENSOR 
on page 8-127. Replace the coolant temperature sen-
sor. 
						

							
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
R/B
17B
B
L
W
R/W P/BGy/GB/L
R/B
Y/L R/L
Y/G Y/G L/Y
R/W
Gy
Gy
Y
Y
Br/W
Br/W
G/W
G/W
R/WL/R
B/YBB/GG/WW
Ch
Dg
B BBr/R R/B R/B
G/B G/B
L/W
P/B P/B
Gy/G
Gy/G
O/B O/B
Gy/B Gy/B
B/W
R/W
B/W
YW/YG/WGy/GB/LB/RB/YL/Y
Y/LP/B
Y/RBG/Y
R/BGy/B Br/W
Y/GP/WLB/W
R/WR/LL/WGyBr/RBY/BG/BO/B
Ch38 39
40
42
44 45
46
47
48
49
50
50
43
41R/Y
LgY/LWG/W
R/WR/G G/R
Ch
DgB/WR/YYG/L
B
L/R
B W
W
B
R/W
R/W
B
G/W
G/W A
L/RBL/RB
B
R/GR/G
B/W Y/L
B B/GB
B/Y B
Dg A
G/L
G/L
A
Dg
B
Ch B
Lg
Lg
B/Y
51
B/Y
62
65
OFF
RUN
77
FREE
PUSH
R/Y
67
B B
B
7
R
R/W210G/YL/W
R/WR/BB
Br
G/YW/L R/WR/BBBr R
R/WL/W
9
78R R/W2
L/G L/G
R/W
R/W
69
B
Br/L
64
Y
L
B HI
LO
W/L
W/L
Y/B
Br
BrOFF
ON
8
L
N
R
63
YL BL
L/W
Br/L
61
Br/W
Br/L
Br/L
OFF
ON ON
Y Y
B
Dg
Y
L/B
Br/WR/Y
Ch
L/Y
G
BB/YBrR/YGY/B
R/Y
R/Y
Dg Y
L/BBr/WR/Y
ChB/RBB/YBr
13
B
BBrYBr
G/Y
5B
R
R
L/W
L/W
R/B
B84B/Y
B/Y
12B
BL/GB
71 72 73 74 75 76
70
B/R
B/R11
R/Y
R/Y66
Ch
B
85
R28
Br
R/W2
Y
Y
L/BDg
B
Br/WBr/G
Br/GBr/GBr/W
Br/WCh
Ch Dg
Dg
Ch Dg
BG/W
R/W
B
R/L
G
G
B
B
L/YB/Y
Dg B
W
Br
B R/W
Sb Sb
R/L R/L
52
68
L/R
R/L
W/L
R/B
L/W
R
Lg
B/Y
Sb
B/R
L/GR/WL/YL/W
Br/R
WB R/B
L/Y
SbSb
R/W
AG/R
G/R
B
14
BL
W W G/W
G/W
G/L
Lg
Lg
82Ch B Ch
B
80 79
81
79 83
B
B B
B L/R
Dg
B
Dg
B
L/R
BB
BB B/Y B
B/G B
BB/G
B/Y
Dg
Ch
B R
R
R
Br/BBr/B
2W
W
W WW
W
4R
WW
WW
WW
53 54
56
55 57R
Br/LBB1
58
R/G
BB3
BB4
BB
BB
Br/L
BB
BB
B2 B1
Br/BLG/Y
R/W
BB
B2
BB2
BB3
BB1
BB4Br/RB
59
R/W
3
B
L B
L
L
L
B
G/Y R/W
R
Br/L B
B B
B/W
BBB
R/GY/LG/L R/W
R
B
W
W
W
B
6
BB2 B2Y/L
B
B2R/GY/LLgR/WBr/RBr/R
ON
OFF1
60
G/L
R/G
R/G
R/WL/RYBG-G/WWChDg
B/L
WIRE SUB LEAD2D
MAIN HARNESS WIRE SUB LEAD1
C
MAIN HARNESS CORD HEAD LIGHT2
B
MAIN HARNESS
CORD HEAD LIGHT1A
MAIN HARNESS
OFF
30
Br/W
W/R W/R
29
W/Y
Sb
B
LgW/RSb B
LgWRSb SbB
31
Br/WG/WW/BB
B1
Lg
W/Y
W/R
Y/W
L
Lg Lg
Br
B/W
B/W
B
R/Y
G/W
Y R/W
B1 L
W/B
W/B
R
R
R
W/L W/L
GG L
L
B1
B1
Y/W
Y/W
B
B
R/W3
R/W3
R/YW/LGB/WR/W
WL/WB/WSb
Y
33
BrR/W3W/BR
32BY/W
L/W
34GL
GL
BR/W
R
RW/LG
BR/W3
W 
						

							
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
35.Cylinder-#1/#4 ignition coil
36.Cylinder-#2/#3 ignition coil
37.Spark plug
42.Neutral indicator light
44.Multi-function meter
45.Engine trouble warning light
56.Engine stop switch
64.Ignition fuse 
						

							
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 of the ECU.
 To inform the rider that the fuel injection system  is not functioning, the engine trouble warning light 
flashes when the start switch is being pushed to start the engine.
 If a malfunction is detected in the system by the self-diagnostic function, the ECU provides an 
appropriate substitute characteristic operation, and alerts the rider of the detected malfunction by 
illuminating the engine trouble warning light.
 After the engine has been stopped, the lowest fault code number appears on the clock LCD. Once 
a fault code has been displayed, it remains stored in the memory of the ECU until it is deleted.
Engine trouble warning light indication and FI system operation
* The warning light flashes when any one of the co nditions listed below is present and the start
switch is pushed:
Checking for a defective engine trouble warning light bulb
The engine trouble warning light comes on for 1.4 seconds after the main switch has been turned to 
“ON” and when the start switch is being pushed. If the warning light does not come on under these 
conditions, the warning light bulb may be defective. Warning light indica-
tion ECU operation FI operation Vehicle operation
Flashing* Warning provided 
when unable to start 
engine
Operation stopped Cannot be operated
Remains on Malfunction detected Operated with substi-
tute characteristics in 
accordance with the 
description of the mal-
functionCan or cannot be oper-
ated depending on the 
fault code
12: Crankshaft position sensor 41: Lean angle sensor
(open or short-circuit)
19: Sidestand switch
(open circuit in the wire to the ECU)
50:ECU internal malfunction
(faulty ECU memory)
30: Lean angle sensor
(latch up detected)
a. Main switch “OFF”
b. Main switch “ON”
c. Engine trouble warning light off
d. Engine trouble warning light on for 1.4 sec-
onds 
						

							
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 engine with alternate operating instructions 
that enable the engine to continue to operate or stop operating, depending on the conditions.
The ECU takes fail-safe actions in two ways: one in which the sensor output is set to a prescribed 
value, and the other in which the ECU directly operates an actuator. Details on the fail-safe actions 
are given in the table below.
Self-Diagnostic Function
Fault 
code No. Item Symptom Able/
unable to  start Able/
unable to  drive
12 Crankshaft position 
sensor No normal signals are received 
from the crankshaft position sen-
sor.
Unable Unable
13 Intake air pressure 
sensor
(open or short circuit) Intake air pressure sensor-open or 
short circuit detected.
Able Able
14 Intake air pressure 
sensor
(pipe system) Intake air pressure sensor-pipe 
system malfunction (clogged or 
detached hose).
Able Able
15 Throttle position sen-
sor
(open or short circuit) Throttle position sensor-open or 
short circuit detected.
Able Able
16 Throttle position sen-
sor
(stuck) The throttle position sensor is 
stuck.
Able Able
19 Sidestand switch
(open circuit wire har-
ness to ECU) Open circuit is detected in the input 
line from the sidestand switch to 
the ECU.
Unable Unable
21 Coolant temperature 
sensor Coolant temperature sensor-open 
or short circuit detected.
Able Able
22 Intake air temperature 
sensor Intake air temperature sensor-
open or short circuit detected.
Able Able
24 O
2 sensor No normal signal is received from 
the O2 sensor.
Able Able
30 Lean angle sensor Latch up detected.
No normal signal is received from 
the lean angle sensor. Unable Unable
33 Ignition coil (#1, #4)
(faulty ignition) Malfunction detected in the pri-
mary wire of the ignition coil (#1, 
#4). Able
(depending 
on the num-
ber of faulty  cylinders) Able
(depending 
on the num-
ber of faulty  cylinders) 
						

							
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 is detected in 
the neutral switch.
Able Able
43 Fuel system voltage
(monitor voltage) The ECU is unable to monitor the 
battery voltage
(an open circuit in the line to the 
ECU).
Able Able
44 Error in writing the 
amount of CO adjust-
ment on EEPROM Error is detected while reading or 
writing on EEPROM (CO adjust-
ment value).
Able Able
46 Vehicle system power 
supply
(Monitoring voltage) Power supply to the fuel injection 
system is not normal.
Able Able
50 ECU internal malfunc-
tion
(memory check error) Faulty ECU memory. (When this 
malfunction is detected in the ECU, 
the fault code number might not 
appear on the meter.)
Unable Unable
— Start unable warning Engine trouble warning light 
flashes when the start switch is 
turned ON.
Relay is not turned ON even if the 
crank signal is input while the start 
switch is turned ON.
When the start switch is turned ON 
while an error is detected with the 
fault code of No.12, 19, 30, 41, 43 
or 50. Unable Unable
Fault 
code No. Item Symptom Able/
unable to  start Able/
unable to  drive
Er-1 ECU internal malfunc-
tion
(output signal error) No signals are received from the 
ECU.
Unable Unable
Er-2 ECU internal malfunc-
tion
(output signal error) No signals are received from the 
ECU within the specified duration.
Unable Unable
Fault 
code No. Item Symptom Able/
unable to 
start Able/
unable to 
drive 
						

							
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 case of malfunction.
3. Perform ECU reinstatement action. Refer to “Reinstatement method” of table in 
“TROUBLESHOOTING DETAILS”.
4. Turn the main switch to “OFF” and back to  “ON”, then check the fault code number is 
not displayed.
NOTE:
If other fault code displayed, repeat steps (1) to 
(4) until all fault code number is not displayed.
5. The Malfunction history is stored even if the main switch is turned OFF. The malfunction  history must be erased in the diagnostic 
mode. Refer to “Sensor operation table 
(Diagnostic code No.62)”.
The engine operation is not normal but the
engine trouble warning light does not come
on.
1. Check the operation of following sensors  and actuators in the Diagnostic mode. 
Refer to “Sensor operation table”.
If malfunction the sensors or actuators, 
repair or replace it.
If not malfunction the sensors and actua-
tors, check and repair the engine inner 
parts.
Er-3
ECU internal malfunc-
tion
(output signal error) Data from the ECU cannot be 
received correctly.
Unable Unable
Er-4 ECU internal malfunc-
tion
(input signal error) Non-registered data has been 
received from the meter.
Unable Unable
Fault 
code No. Item Symptom Able/
unable to 
start Able/
unable to 
drive
Fault code No. YES Fault code No. NO
Check and repair. 
Refer to TROUBLE-
SHOOTING 
DETAILS on page 8-
43.
Monitor the operation 
of the sensors and 
actuators in the diag-
nostic mode. Refer to 
“Sensor operation 
table”. Check and repair. 
Refer to Self Diagnos-
tic Function.
01: Throttle position sensor (throttle angle)
30: Ignition coil #1, #4
31: Ignition coil #2, #3
36: Injector #1, #4
37: Injector #2, #3
48: AI system solenoid 
						

							
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” button to select the CO adjustment mode “CO” or the diagnostic monitoring mode “dIAG”.
5. After selecting “dIAG”, simultaneously press  the “SELECT” and “RESET” buttons for 2 seconds 
or more to execute the selection.
6. Set the engine stop switch to “OFF”.
7. Select the diagnostic code number that applies to the item that was verified with the fault code  number by pressing the “SELECT” and “RESET” buttons.
NOTE:
The diagnostic code number appears on the clock LCD (01–70).
 To decrease the selected diagnos tic code number, press the “RESET” button. Press the “RESET” 
button for 1 second or longer to automatically decrease the diagnostic code numbers.
 To increase the selected diagnostic code num ber, press the “SELECT” button. Press the 
“SELECT” button for 1 second or longer to automatically increase the diagnostic code numbers.
A. FZ6-N/FZ6-NA/FZ6-S/FZ6-SA
B. FZ6-NHG(W)/FZ6-NAHG/FZ6-SHG(W)/
FZ6-SAHG