Yamaha FZS6W 07 User Manual

FUEL INJECTION SYSTEM
8-50
Fault code No. 42 SymptomA No normal signals are received from the speed sensor.
B Open or short circuit is detected in the neutral switch.
Diagnostic code No. A 07 Speed sensor
B21Neutral switch
Order Item/components and probable 
cause Check or maintenance job Reinstate-
ment method
A-1 Connected state of connector
 Speed sensor coupler
 Main wire harness ECU coupler
 Check the coupler for any pins 
that may have pulled out.
 Check the locking condition of 
the coupler....

FUEL INJECTION SYSTEM
8-51
Fault code No. 43 Symptom The ECU is unable to monitor the battery voltage.
Diagnostic code No. 50 Fuel injection system relay
Order Item/components and probable 
cause Check or maintenance job Reinstate-
ment method
1 Connected state of connector
 Fuel injection system relay coupler
 Main wire harness ECU coupler
 Check the coupler for any pins 
that may have pulled out.
 Check the locking condition of  the coupler.
 If there is a malfunction, repair it  and connect it...

FUEL INJECTION SYSTEM
8-52
Fault code No. 46 Symptom Power supply to the FI system relay is not normal.Diagnostic monitor- ing code No. ——
Order Item/components and probable 
cause Check or maintenance job
Reinstate-
ment method
1 Connected state of connector.
 Main wire harness ECU coupler
 Check the coupler for any pins 
that may have pulled out.
 Check the locking condition of 
the coupler.
 If there is a malfunction, repair it  and connect it securely. Starting the 
engine and 
operating it at...

FUEL INJECTION SYSTEM
8-53
Fault code No. Er-1 Symptom No signals are received from the ECU.
Diagnostic code No. — —
Order Item/components and probable 
cause Check or maintenance job Reinstate-
ment method
1 Connected state of connector
 Main wire harness ECU coupler
 Main wire harness meter coupler
 Sub-wire harness coupler  Check the coupler for any pins 
that may have pulled out.
 Check the locking condition of  the coupler.
 If there is a malfunction, repair it  and connect it securely....

FUEL INJECTION SYSTEM
8-54
Fault code No. Er-3 Symptom Data from the ECU cannot be received correctly.
Diagnostic code No. — —
Order Item/components and probable 
cause Check or maintenance job Reinstate-
ment method
1 Connected state of connector
 Main wire harness ECU coupler
 Main wire harness meter coupler
 Sub-wire harness coupler  Check the coupler for any pins 
that may have pulled out.
 Check the locking condition of  the coupler.
 If there is a malfunction, repair it  and connect it...

FUEL PUMP SYSTEM
8-55
EAS27550
FUEL PUMP SYSTEM
EAS27560
CIRCUIT DIAGRAM 

FUEL PUMP SYSTEM
8-56
1. Main switch
5. Fuel injection system fuse
7. Main fuse
9. Battery
10.Starting circuit cut-off relay
13.Fuel pump
21.ECU (engine control unit)
46.Engine stop switch
53.Ignition fuse 

FUEL PUMP SYSTEM
8-57
EAS27570
TROUBLESHOOTING
If the fuel pump fails to operate.
NOTE:
 Before troubleshooting, remove the following part(s):
1. Seat
2. Front cowling inner panel3
3. Fuel tankNG→
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 8-67. Replace the fuse(s).
2. Check the battery. Refer to CHECKING AND 
CHARGING THE BATTERY on 
page 8-68.  Clean the battery terminals.
 Recharge...

FUEL PUMP SYSTEM
8-58 

ELECTRICAL COMPONENTS
8-59
EAS27970
ELECTRICAL COMPONENTS