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,...

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...

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...

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...

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...

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...

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...

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...

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...

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
...