Yamaha Mt 01 T 2005 Manual

FUEL INJECTION SYSTEM
7-56
Fault code No. 38 Symptom Decompression solenoid: open or short circuit detected.
Diagnostic code No. 55 Decompression solenoid
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Installed state of decompression 
solenoid.Check for looseness or pinching. Turning the 
main switch to 
“ON”.
2 Connections
Decompression solenoid coupler
Main wire harness ECU couplerCheck the coupler for any pins 
that may be pulled out.
Check the locking...

FUEL INJECTION SYSTEM
7-57
Fault code No. 41 Symptom Lean angle cut-off switch: open or short circuit detected.
Diagnostic code No. 08 Lean angle cut-off switch
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Lean angle cut-off switch coupler
Main wire harness ECU couplerCheck 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...

FUEL INJECTION SYSTEM
7-58
Fault code No. 42 Symptom A. No normal signals are received from the speed sensor.
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 
causeCheck or maintenance job Reinstatement 
method
A-1 Connections
Speed sensor coupler
Main wire harness ECU couplerCheck the coupler for any pins 
that may be pulled out.
Check the locking condition of 
the coupler.
If there is a malfunction,...

FUEL INJECTION SYSTEM
7-59
B-1 Connections
Neutral switch coupler
Main wire harness ECU couplerCheck 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.Starting the 
engine, and 
activating the 
vehicle speed 
sensor by 
operating the 
vehicle at 20 to 
30 km/h.
B-2 Open circuit in neutral switch lead.Repair or replace if there is an 
open circuit.
Between neutral switch coupler 
and...

FUEL INJECTION SYSTEM
7-60
Fault code No. 43 Symptom The ECU is unable to monitor the battery voltage (an open 
or short circuit in the line to the ECU).
Diagnostic code No. 09 Fuel system voltage
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Relay unit coupler (fuel pump relay)
Main wire harness ECU couplerCheck the coupler for any pins 
that may be pulled out.
Check the locking condition of 
the coupler.
If there is a malfunction, repair it...

FUEL INJECTION SYSTEM
7-61
Fault code No. 46 Symptom Power supply to the fuel injection system is not normal.
Diagnostic code No.——
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Main wire harness ECU couplerCheck 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.Starting the 
engine and 
operating it at 
idle.
2 Faulty...

FUEL INJECTION SYSTEM
7-62
Fault code No. 62 Symptom Muffler cooling fan temperature sensor: open or short cir-
cuit detected.
Diagnostic code No. 12 Muffler cooling fan temperature sensor
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Installed condition of muffler cooling 
fan temperature sensor.Check for looseness or pinching. Turning the 
main switch to 
“ON”.
2 Connections
Muffler cooling fan temperature 
sensor coupler
Main wire harness ECU couplerCheck...

FUEL INJECTION SYSTEM
7-63
Fault code No. 63 Symptom Engine trouble warning light is flashing. (Abnormally high 
temperature is detected by muffler cooling fan tempera-
ture sensor.)
Diagnostic code No. 12
51
63Muffler cooling fan temperature sensor
Muffler cooling fan motor relay
Stopping the flashing of the engine trouble warning light 
(erasing the muffler cooling fan temperature sensor fault 
code)
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Muffler cover...

FUEL INJECTION SYSTEM
7-64
Fault code No. Er-2 Symptom No signals are received from the ECU within the specified 
duration.
Diagnostic code No.——
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Main wire harness ECU coupler
Main wire harness meter assembly 
couplerCheck 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.Turning the...

FUEL INJECTION SYSTEM
7-65
Fault code No. Er-4 Symptom Non-registered data has been received from the meter.
Diagnostic code No.——
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Main wire harness ECU coupler
Main wire harness meter assembly 
couplerCheck 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.Turning the 
main switch to...