Yamaha Fz1n Service Manual

							
FUEL INJECTION SYSTEM
8-57
Fault code No. 22 SymptomIntake air temperature sensor:open or short circuit 
detected.
Diagnostic code No. 05 Intake air temperature sensor
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Connections
 Intake air temperature sensor cou-
pler
 Main wire harness ECU coupler
 Sub-wire harness coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it  and connect the coupler 
securely. Turning the 
main switch to 
“ON”.
2 Open or short circuit in wire harness.  Repair or replace if there is an 
open or short circuit.
 Between intake air temperature  sensor coupler and ECU cou-
pler.
(Brown/White–Brown/White)
(Black/Blue–Black/Blue)
3 Defective intake air temperature sen-
sor.
 Execute the diagnostic mode. 
(Code No.05)
 Replace if defective. Refer to CHECKING THE 
INTAKE AIR TEMPERATURE 
SENSOR on page 8-112. 
						

							
FUEL INJECTION SYSTEM
8-58
Fault code No. 23 SymptomAtmospheric pressure sensor:open or short circuit 
detected.
Diagnostic code No. 02 Atmospheric pressure sensor
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Connections
 Atmospheric pressure sensor cou-
pler
 Main wire harness ECU coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it  and connect the coupler 
securely. Turning the 
main switch to 
“ON”.
2 Open or short circuit in wire harness 
and/or sub wire harness 2.
 Repair or replace if there is an 
open or short circuit.
 Between atmospheric pressure  sensor coupler and ECU cou-
pler.
(Black/Blue–Black/Blue)
(Pink–Pink)
(Blue–Blue)
3 Defective atmospheric pressure sen-
sor.
 Execute the diagnostic mode. 
(Code No.02)
 Replace if defective.
Refer to CHECKING THE 
ATMOSPHERIC PRESSURE 
SENSOR on page 8-111. 
						

							
FUEL INJECTION SYSTEM
8-59
Fault code No. 24 SymptomNo normal signal is received from the O2 sensor.
Diagnostic code No. — —
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Installed state of O
2 sensor. Check for looseness or pinching. Start and warm 
up the engine 
until the cool-
ant tempera-
ture rises over 
60 °C.
when accelerat-
ing the throttle, 
the waring light 
is turned off, or 
it is reset by the 
diagnostic 
mode (Code 
No.63).
2
Connections
O
2 sensor coupler
 Main wire harness ECU coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of 
the couplers
 If there is a malfunction, repair it  and connect the coupler 
securely.
3 Open or short circuit in wire harness.  Repair or replace if there is an 
open or short circuit.
 Between O
2 sensor coupler and 
ECU coupler.
(Gray/Green–Gray/Green)
(Black/Blue–Black/Blue)
(Pink/Black–Pink/Black)
(Red/White–Red/White)
4 Check fuel pressure.  Refer to THROTTLE BODIES 
on page 7-4.
5 Defective O
2 sensor.  Replace if defective.
Fault code No. 30 Symptom No normal signal is received from the lean angle sensor.
Diagnostic code No. 08 Lean angle sensor
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 The vehicle has overturned. Raise the vehicle upright. Turning the  main switch to 
”ON” (however, 
the engine can-
not be restarted 
unless the main 
switch is first 
turned to 
“OFF”).
2
Installed state of the lean angle sen-
sor Check the installed direction and 
condition of the sensor.
3 Connections
 Lean angle sensor coupler
 Main wire harness ECU coupler
 Check the coupler for any pins 
that may be pulled out.
 Check the locking condition of 
the coupler.
 If there is a malfunction, repair it  and connect the coupler 
securely.
4 Defective lean angle sensor  Execute the diagnostic mode. 
(Code No.08)
 Replace if defective.
Refer to CHECKING THE 
LEAN ANGLE SENSOR on 
page 8-105. 
						

							
FUEL INJECTION SYSTEM
8-60
Fault code No. 33 SymptomOpen circuit detected in the primary lead of the cylinder-
#1 ignition coil.
Diagnostic code No. 30 Cylinder-#1 ignition coil
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Connections
 Cylinder-#1 ignition coil coupler
 Main wire harness ECU coupler
 Sub-wire harness 1 coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it  and connect the coupler 
securely. Starting the 
engine and 
operating it at 
idle.
2 Open or short circuit in wire harness 
and/or sub-wire harness 1.
 Repair or replace if there is an 
open or short circuit.
 Between cylinder-#1 ignition  coil coupler and ECU coupler.
(Red/Black–Red/Black)
(Orange–Orange)
3 Defective cylinder-#1 ignition coil  Execute the diagnostic mode. 
(Code No.30)
 Test the primary and secondary  coils for continuity.
 Replace if defective.
Refer to CHECKING THE 
IGNITION COILS on page 8-
103. 
						

							
FUEL INJECTION SYSTEM
8-61
Fault code No. 34 SymptomOpen circuit detected in the primary lead of the cylinder-
#2 ignition coil
Diagnostic code No. 31 Cylinder-#2 ignition coil
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Connections
 Cylinder-#2 ignition coil coupler
 Main wire harness ECU coupler
 Sub-wire harness 1 coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it  and connect the coupler 
securely. Starting the 
engine and 
operating it at 
idle.
2 Open or short circuit in wire harness 
and/or sub-wire harness 1.
 Repair or replace if there is an 
open or short circuit.
 Between cylinder-#2 ignition  coil coupler and ECU coupler.
(Red/Black–Red/Black)
(Gray/Red–Gray/Red)
3 Defective cylinder-#2 ignition coil.  Execute the diagnostic mode. 
(Code No.31)
 Test the primary and secondary  coils for continuity.
 Replace if defective.
Refer to CHECKING THE 
IGNITION COILS on page 8-
103. 
						

							
FUEL INJECTION SYSTEM
8-62
Fault code No. 35 SymptomOpen circuit detected in the primary lead of the cylinder-
#3 ignition coil
Diagnostic code No. 32 Cylinder-#3 ignition coil
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Connections
 Cylinder-#3 ignition coil coupler
 Main wire harness ECU coupler
 Sub-wire harness 1 coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it  and connect the coupler 
securely. Starting the 
engine and 
operating it at 
idle.
2 Open or short circuit in wire harness 
and/or sub-wire harness 1.
 Repair or replace if there is an 
open or short circuit.
 Between cylinder-#3 ignition  coil coupler and ECU coupler.
(Red/Black–Red/Black)
(Orange/Green–Orange/Green)
3 Defective cylinder-#3 ignition coil.  Execute the diagnostic mode. 
(Code No.32)
 Test the primary and secondary  coils for continuity.
 Replace if defective.
Refer to CHECKING THE 
IGNITION COILS on page 8-
103. 
						

							
FUEL INJECTION SYSTEM
8-63
Fault code No. 36 SymptomOpen circuit detected in the primary lead of the cylinder-
#4 ignition coil
Diagnostic code No. 33 Cylinder-#4 ignition coil
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Connections
 Cylinder-#4 ignition coil coupler
 Main wire harness ECU coupler
 Sub-wire harness 1 coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it  and connect the coupler 
securely. Starting the 
engine and 
operating it at 
idle.
2 Open or short circuit in wire harness 
and/or sub-wire harness 1.
 Repair or replace if there is an 
open or short circuit.
 Between cylinder-#4 ignition  coil coupler and ECU coupler.
(Red/Black–Red/Black)
(Gray/Green–Gray/Green)
3 Defective cylinder-#4 ignition coil.  Execute the diagnostic mode. 
(Code No.33)
 Test the primary and secondary  coils for continuity.
 Replace if defective.
Refer to CHECKING THE 
IGNITION COILS on page 8-
103. 
						

							
FUEL INJECTION SYSTEM
8-64
Fault code No. 39 Symptom Open circuit detected in a injector.
Diagnostic code No. 36
37
38
39 Injector #1
Injector #2
Injector #3
Injector #4
Order Item/components and probable 
cause Check or maintenance job
Reinstatement 
method
1 Connections
 Injector coupler
 Main wire harness ECU coupler
 Sub-wire harness coupler  Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it 
and connect the copler 
securely. Start the engine 
and operating it 
at idle.
2 Open or short circuit in wire harness 
and/or sub-wire harness.
 Repair or replace if there is an 
open or short circuit.
 Between primary injector cou- pler and ECU coupler.
(Red/Blue-Red/Blue)
#1: (Red/Black–Red/Black)
#2: (Green/Black–Green/Black)
#3: (Blue/Black–Blue/Black)
#4: (Orange/Black–Orange/
Black)
3 Defective primary injector.  Execute the diagnostic mode. 
(Code Nos.36, 37, 38, 39)
 Replace if defective.
Refer to CHECKING THE 
INJECTORS on page 7-8. 
						

							
FUEL INJECTION SYSTEM
8-65
Fault code No. 41 Symptom Lean angle sensor:open or short circuit detected.
Diagnostic code No. 08 Lean angle sensor
Order Item/components and probable 
cause Check or maintenance job
Reinstatement 
method
1 Connections
 Lean angle sensor coupler
 Main wire harness ECU coupler
 Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it 
and connect the coupler 
securely. Turning the 
main switch to 
“ON”.
2 Open or short circuit in lead.  R
epair or replace if there is an 
open or short circuit.
 Between lean angle sensor  coupler and ECU coupler.
(Blue–Blue)
(Yellow/Green–Yellow/Green)
(Black/Blue–Black/Blue)
3 Defective lean angle sensor.  Execute the diagnostic mode. 
(Code No.08)
 Replace if defective. Refer to CHECKING THE 
LEAN ANGLE SENSOR on 
page 8-105. 
						

							
FUEL INJECTION SYSTEM
8-66
Fault code No. 42 SymptomA. No normal signals are received from the speed sen-
sor.
B. Open circuit is detected in the neutral switch.
Diagnostic code No. A 07 Speed sensor
B 21 Neutral switch
Order Item/components and probable 
cause Check or maintenance job Reinstatement 
method
A-1 Installed state of speed sensor
.  Check for looseness or pinch-
ing. Starting the 
engine, and 
activating the 
speed sensor 
by operating the 
vehicle at 20 to 
30 km/h.
A-2 Connections
 Speed sensor coupler
 Main wire harness ECU coupler
 Check the couplers for any pins 
that may be pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair it 
and connect the coupler 
securely.
A-3 Open or short circuit in lead.  R
epair or replace if there is an 
open or short circuit.
 Between speed sensor coupler  and ECU coupler.
(Blue–Blue)
(White/Yellow–White/Yellow)
(Black/Blue–Black/Blue)
A-4 Defective speed sensor  Execute the diagnostic mode. 
(Code No.07)
 Replace if defective.
Refer to CHECKING THE 
SPEED SENSOR on page 8-
107.