Yamaha Fz1n Service Manual

							
FUEL PUMP SYSTEM
8-77
EAS27570
TROUBLESHOOTING
If the fuel pump fails to operate.
NOTE:
 Before troubleshooting, remove the following part(s):
1 Rider and passenger seat
2 Fuel tank
3 Air filter caseNG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
1 Check the fuses.
(Main, ignition and fuel injection 
system)
Refer to CHECKING THE FUSES 
on page 8-97. Replace the fuse(s).
2 Check the battery. Refer to CHECKING AND 
CHARGING THE BATTERY on 
page 8-97.  Clean the battery terminals.
 Recharge or replace the battery.
3 Check the main switch. Refer to CHECKING THE 
SWITCHES on page 8-93. Replace the immobilizer kit.
4 Check the engine stop switch. Refer to CHECKING THE 
SWITCHES on page 8-93. Replace the right handlebar switch.
5 Check the relay unit (fuel pump  relay).
Refer to CHECKING THE 
RELAYS on page 8-100. Replace the relay unit.
6 Check the fuel pump. Refer to CHECKING THE FUEL 
PRESSURE on page 7-8. Replace the fuel pump.
7 Check the entire fuel pump sys- tem’s wiring.
Refer to CIRCUIT DIAGRAM on 
page 8-75. Properly connect or repair the fuel 
pump system’s wiring.
Replace the ECU. 
						

							
FUEL PUMP SYSTEM
8-78 
						

							
IMMOBILIZER SYSTEM
8-79
EAS27640
IMMOBILIZER SYSTEM
EAS27650
CIRCUIT DIAGRAM 
						

							
IMMOBILIZER SYSTEM
8-80
1. Main switch
4. Fuse (backup)
5. Immobilizer unit
6. Fuse (main)
7. Battery
23.ECU
41.Immobilizer indicator
46.Multi function meter
78.Fuse (ignition) 
						

							
IMMOBILIZER SYSTEM
8-81
EAS27670
GENERAL INFORMATION
This vehicle is equipped with an immobilizer system to help prevent theft by re-registering codes in 
the standard keys. This system consists of the following.
 A code re-registering key (with a red bow)
 Two standard keys (with a black bow) that can be re-registered with new codes
 A transponder (which is installed in each key bow)
 An immobilizer unit
 The ECU
 An immobilizer system indicator light
The key with the red bow is used to register codes in each standard key. Do not use the key with the 
red bow for driving. It should only be used for re-registering new codes in the standard keys. The 
immobilizer system cannot be operated with a new key until the key registered with a code. If you 
lose the code re-registering key, the ECU and main  switch (included with an immobilizer unit) needs 
to be replaced.
Therefore, always use a standard key for driving. (See caution below.)
NOTE:
Each standard key is registered during production, t herefore re-registering at purchase is not neces-
sary.
CAUTION:
ECA14970
 DO NOT LOSE THE CODE RE-REGISTERING KEY! If the code re-registering key is lost, reg-
istering new codes in the standard keys is impossible. The standard keys can still be used 
to start the vehicle, however if code re-registe ring is required (i.e., if a new standard key is 
made or all keys are lost) the entire immobilizer system must be replaced. Therefore, it is 
highly recommended to use either standard key after any code re-registering and keep the 
code re-registering key in a safe place.
 Do not submerse either of the keys in water.
 Do not expose the keys to excessively high temperatures.
 Do not place either of the keys close to magnets (this includes, but not limited to, products  such as speakers, etc.).
 Do not place heavy items on either key.
 Do not grind either key or alter their shape.
 Do not disassemble the plastic part of either key.
 Keep other immobilizer keys away for this unit’s code re-registering key and main switch.
EAS27691
PART REPLACEMENT AND KEY CODE REGISTRATION REQUIREMENTS
In the course of use, you may encounter the following cases where replacement of parts and regis-
tration of code re-registering/standard keys are required.
NOTE:
Each standard key is registered during production, t herefore re-registering at purchase is not neces-
sary.
Parts to be replaced Key registration requirement
Main switch/immo-
bilizer unit Standard 
key ECUAcces-
sory lock*  and key
Main 
switch Immobi-
lizer unit
Standard key is lost ✓New standard key 
						

							
IMMOBILIZER SYSTEM
8-82
* Accessory locks mean the seat lock, fuel tank cap or the helmet holder.
Code re-registering key registration:
When the immobilizer unit or ECU is replaced, the code re-registering key must be registered to the 
unit.
To register a code re-registering key:
1. Turn the main switch to “ON”  with the code re-registering key.
NOTE:
Check that the immobilizer system indicator light comes on for one second, then goes off. When the 
immobilizer system indicator light goes off,  the code re-registering key has been registered.
2. Check that the engine can be started.
3. Register the standard key, following the instructions in the section below.
Standby mode:
To enable the immobilizer system, turn the ignition ke y to “OFF”. 30 seconds later, the indicator light 
will start flashing continuously in  the standby flashing mode pattern for up to 24 hours. After that 
time, the indicator light will stop flashing, bu t the immobilizer system is still enabled.
All keys have been 
lost (including code 
re-registering key)
✓✓✓✓ Code re-registering 
key and standard 
keys
ECU is defective ✓Code re-registering 
key and standard 
keys
Immobilizer unit is 
defective ✓ Code re-registering 
key and standard 
keys
Main switch is defec-
tive ✓✓✓✓ Code re-registering 
key and standard 
keys
Accessory lock* is 
defective ✓
No required
Parts to be replaced
Key registration requirement
Main switch/immo-
bilizer unit Standard 
key ECUAcces-
sory lock* 
and key
Main 
switch Immobi-
lizer unit 
						

							
IMMOBILIZER SYSTEM
8-83
Standby mode
Standard key registration:
Standard key registration is required when a standard key is lost and needs to be replaced, or when 
the code re-registering key is re-registered after the immobilizer unit or ECU are replaced.
NOTE:
Do not start the engine with a standard key that has not been registered. If the main switch is turned 
“ON” with a standared key that has not been regi stered, the immobilizer system indicator light 
flashes to indicate fault code “52”. (Refer  to SELF-DIAGNOSIS FAULT CODE INDICATION on 
page 8-85).
1. Check that the immobilizer system indicator light signals the standby mode.
2. Using the code re-registering key, turn the main switch “ON”, then “OFF”, and then remove the 
key within 5 seconds.
3. Insert the first standard key to be registered into the main switch, then turn the key to “ON” within 
5 seconds to activate th e key registration mode.
NOTE:
The existing standard key code is erased from the memory when the key registration mode is acti-
vated. When the key registration mode is activated,  the immobilizer system indicator light flashes 
rapidly.
4. While the indicator light is flas hing, turn the main switch to “OFF”, remove the key, and within 5 
seconds, insert the second standard key to be registered into the main switch.
NOTE:
If the immobilizer system indicator light stops flas hing 5 seconds after the first standard key is regis-
tered, the registration mode is deactivated. If this occurs, the second standard key cannot be regis-
tered, and steps 2 to 4 need to be repeated to register both standard keys.
5. Turn the main switch to “ON”.
NOTE:
When the indicator light goes off, the registration is complete.
6. Check that the engine can be started with the two registered standard keys.
a. Main switch “ON”
b. Main switch “OFF”
c. LED on d. LED off
e. Standby mode on
f. Standby mode off 
						

							
IMMOBILIZER SYSTEM
8-84
Standard key registration
Voiding the standard key code:
If a standard key has been lost, it is possible to disable its use by re-registering the remaining stan-
dard key. Standard key registration erases the stored standard key code from the memory, thus dis-
abling the lost  standard key. To re-register, refer to “Standard key registration”.
Standard key code voiding method
a. Main switch “ON”
b. Main switch “OFF”
c. LED on
d. LED off
e. Less than 5.0 s
f. Code re-registering key
g. First standard keyh. Second standard key
i. Registration mode
A. Registration of the second standard key is 
complete.
B. Immobilizer system indicator light stops  flashing when the registration of the second 
standard key is complete.
a. Main switch “ON”
b. Main switch “OFF”
c. LED on
d. LED off
e. Less than 5.0 s f. Code re-registering key
g. Remaining standard key
h. Registration mode
A. If the immobilizer s
ystem indicator light 
stops flashing 5 seconds after the first stan-
dard key is registered, the second standard 
key cannnot be registered. 
						

							
IMMOBILIZER SYSTEM
8-85
EAS27700
TROUBLESHOOTING
When the main switch is turn “ON”, the indicator light does not come on or flashing.
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
NG→
OK ↓
EAS27720
SELF-DIAGNOSIS FAULT CODE INDICATION
When the system failure occurred, the error code numb er is indicated in the immobilizer system indi-
cator light blinks at the same time. The pattern of blinking also shows the error code. 1 Check the fuses.
(Main, ignition and backup)
Refer to CHECKING THE FUSES 
on page 8-97. Replace the fuse(s).
2 Check the battery. Refer to CHECKING AND 
CHARGING THE BATTERY on 
page 8-97.  Clean the battery terminals.
 Recharge or replace the battery.
3 Check the main switch. Refer to CHECKING THE 
SWITCHES on page 8-93. Replace the immobilizer kit.
4 Check the entire immobilizer sys- tem’s wiring.
Refer to CIRCUIT DIAGRAM on 
page 8-79. Properly connect or repair the immobi-
lizer system’s wiring.
 Check the condition of the each  immobilizer syst em’s circuits.
 Refer to SELF-DIAGNOSIS FAULT  CODE INDICATION on page 8-85.
Error  code Detection Symptoms Trouble Measures
51 IMMOBILIZER 
UNIT
Cannot transmit 
code between the 
key and immobilizer 
unit. 1 Objects that may keep 
off radio waves exist 
around the keys and 
antennas.
2 Immobilizer unit failure.
3Key failure. 1 Keep clear of 
magnets, metals 
and other keys 
form the surround-
ings of keys and 
antennas.
2 Replace the  immobilizer unit.
3 Replace the key. 
						

							
IMMOBILIZER SYSTEM
8-86
Immobilizer system indicator light error code indication
Digit of 10 : Cycles of 1 sec. ON and 1.5 sec. OFF.
Digit of 1 : Cycles of 0.5 sec. ON and 0.5 sec. OFF.52
IMMOBILIZER 
UNIT
Codes do not match 
between the key and 
immobilizer unit. 1 Disturbed by other 
transponder.
Failed to verify continu-
ally for ten times.
2 Unregistered sub key  was used. 1 Place the immobi-
lizer unit away 
more than 50 mm 
from the transpon-
der of other vehi-
cle.
2 Register the stan-
dard key.
53 IMMOBILIZER 
UNIT
Cannot transmit 
code between the 
ECU and immobi-
lizer unit. Noise interference or dis-
connected lead/cable.
1 Obstruction due to 
radio wave noise.
2 Error by disconnection  of the communication 
harness.
3 Immobilizer unit failure.
4ECU failure. 1 Check the wire 
harness and con-
nector.
2 Replace the  immobilizer unit.
3 Replace the ECU.
54 IMMOBILIZER 
UNIT
Codes do not match 
between ECU and 
immobilizer unit. Noise interference or dis-
connected lead/cable.
1 Obstruction due to 
radio wave noise.
2 Error by disconnection  of the communication 
harness.
3 Immobilizer unit failure.
4ECU failure.
(When the used parts 
form other vehicles are 
used, the code re-reg-
istering key ID is not 
registered to the ECU.) 1 Register the code 
re-registering key 
ID.
2 Check the wire 
harness and con-
nector.
3 Replace the  immobilizer unit.
4 Replace the ECU.
55 IMMOBILIZER 
UNIT Key code registra-
tion error. Same standard key was 
attempted to continu-
ously two times register. Prepare the new 
standard key and 
register it.
56 ECU Undefinition code is 
received. Noise interference or dis-
connected lead/cable.
1 Obstruction due to 
radio wave noise.
2 Error by disconnection 
of the communication 
harness.
3 Immobilizer unit failure
4ECU failure 1 Check the wire 
harness and con-
nector.
2 Replace the  immobilizer unit.
3 Replace the ECU.
Error 
code Detection Symptoms Trouble Measures