Yamaha Fz1n Service Manual

FUEL INJECTION SYSTEM
8-47
09Fuel system voltage
(battery voltage)
Approximately 12.0 Set the engine stop switch 
to “ ” and then compare 
with the actually measured 
battery voltage. (If the bat-
tery voltage is lower, 
recharge the battery.)
20 Sidestand switch Set ON/OFF the sidestand 
switch (with the transmis-
sion in gear).
 Stand retracted ON
 Stand extended OFF
21 Neutral switch Set ON/OFF the neutral 
switch (shift the transmis-
sion).
 Neutral ON
 In gear OFF
60 EEPROM fault cylinder No
...

FUEL INJECTION SYSTEM
8-48
Actuator operation table63
Malfunction code reinstate
 No mulfunction code 00 —
 Malfunction code exists Fault code 24
 (If more than one code 
number is detected, the dis-
play changes every two 
seconds to show all the 
detected code numbers.
When all code numbers are 
shown, the display repeats.) To reinstate, set the engine 
stop switch to “ “ .
70 Control number 0–255 —
Diag-
nostic  code  No. Item Actuation Checking method
30 Cylinder-#1 ignition coil Actuates the...

FUEL INJECTION SYSTEM
8-49
38Injector #3 Actuates the injector #3 five 
times at one-second inter-
vals.
Illuminates the engine trou-
ble warning light. Check the operating sound 
of the injector #3 five times.
39 Injector #4 Actuates the injector #4 five 
times at one-second inter-
vals.
Illuminates the engine trou-
ble warning light. Check the operating sound 
of the injector #4 five times.
48 Air induction system sole-
noid
Actuates the Air induction 
system solenoid five times at 
one-second...

FUEL INJECTION SYSTEM
8-50
EAS27460
TROUBLESHOOTING DETAILS
This section describes the measures per fault code number displayed on the meter. Check and ser-
vice the items or components that are the probable cause of the malfunction following the order 
given.
After the check and service of the malfunctioning part has been completed, reset the meter display 
according to the reinstatement method.
Fault code No.:
Code number displayed on the meter when the engine failed to work normally. Refer to...

FUEL INJECTION SYSTEM
8-51
Fault code No. 12 SymptomNo normal signals are received from the crankshaft posi-
tion sensor.
Diagnostic code No. — — Orde r Item/components and probable 
cause Check or maintenance job Reinstatement 
method
1 Installed condition of crankshaft posi- tion sensor Check for looseness or pinching. Cranking the 
engine.
2 Connections  Crankshaft position sensor coupler
 Main wire harness ECU coupler  Check the couplers for any pins 
that may have pulled out.
 Check the locking...

FUEL INJECTION SYSTEM
8-52
Fault code No. 13 Symptom Intake air pressure sensor:open or short circuit detected.
Diagnostic code No. 03 Intake air pressure sensor
Orde r Item/components and probable 
cause Check or maintenance job
Reinstatement 
method
1 Connections
 Intake air pressure sensor coupler
 Main wire harness ECU coupler
 Sub-wire harness coupler  Check the couplers for any pins 
that may have pulled out.
 Check the locking condition of  the couplers.
 If there is a malfunction, repair...

FUEL INJECTION SYSTEM
8-53
Fault code No. 15 Symptom Throttle position sensor:open or short circuit detected.
Diagnostic code No. 01 Throttle position sensor
Order Item/components and probable 
cause Check or maintenance job
Reinstatement 
method
1 Installed condition of throttle position 
sensor.
 Check for looseness or pinch-
ing.
 Check that is installed in the  specified position. Turning the 
main switch to 
“ON”.
2 Connections
 Throttle position sensor coupler
 Main wire harness ECU coupler
...

FUEL INJECTION SYSTEM
8-54
Fault code No. 16 Symptom Stuck throttle position sensor detected.
Diagnostic code No. 01 Throttle position sensor
Order Item/components and probable 
cause Check or maintenance job
Reinstatement 
method
1 Installed condition of throttle position 
sensor.
 Check the installed area for 
looseness or pinching.
 Check that is installed in the  specified position.
Refer to THROTTLE BODIES 
on page 7-4 section. Reinstated by 
starting the 
engine, operat-
ing it at idle, and...

FUEL INJECTION SYSTEM
8-55
Fault code No. 18 Symptom EXUP servo motor is stuck.
Diagnostic code No. 53 EXUP servo motor
Order Item/components and probable 
cause Check or maintenance job
Reinstatement 
method
1 Connections
 EXUP servo motor coupler
 Main wire harness ECU coupler
 Check the couplers 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. Turning the 
main switch to 
“ON”.
2 Open or...

FUEL INJECTION SYSTEM
8-56
Fault code No. 20 SymptomWhen the main switch is turned to “ON”, the atmospheric 
pressure sensor voltage and intake air pressure sensor  voltage differ greatly.
Diagnostic code No. 02
03Atmospheric pressure sensor
Intake air pressure sensor
Orde r Item/components and probable 
cause Check or maintenance job
Reinstatement 
method
1 Defective intake air pressure sensor or 
atmospheric pressure sensor.
 Execute the diagnostic mode.
(Code Nos. 02, 03)
 Replace if defective....