Yamaha Mt 01 T 2005 Manual

FUEL INJECTION SYSTEM
7-46
Fault code No. 24 Symptom No normal signal is received from the O2 sensor.
Diagnostic code No.——
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Installed state of O
2 sensor. Check for looseness or pinching. Starting the 
engine and 
operating it at 
idle. 2 Connections
O
2 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...

FUEL INJECTION SYSTEM
7-47
Fault code No. 25 Symptom Cylinder-#2 intake air pressure sensor: open or short cir-
cuit detected.
Diagnostic code No. 04 Cylinder-#2 intake air pressure sensor
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Cylinder-#2 intake air pressure 
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, repair...

FUEL INJECTION SYSTEM
7-48
Fault code No. 26 Symptom Cylinder-#2 intake air pressure sensor: hose system mal-
function (clogged or detached hose).
Diagnostic code No. 04 Cylinder-#2 intake air pressure sensor
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Cylinder-#2 intake air pressure sensor 
hoseCheck the cylinder-#2 intake air 
pressure sensor hose condition.
Repair or replace the sensor 
hose.Starting the 
engine and 
operating it at 
idle.
2 Cylinder-#2...

FUEL INJECTION SYSTEM
7-49
Fault code No. 28 Symptom Engine temperature sensor: open or short circuit detect-
ed.
Diagnostic code No. 11 Engine temperature sensor
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Installed state of engine temperature 
sensor.Check for looseness or pinching. Turning the 
main switch to 
“ON”.
2 Connections
Engine temperature sensor coupler
Main wire harness ECU coupler
Sub-wire harness 2 couplerCheck the coupler for any pins...

FUEL INJECTION SYSTEM
7-50
Fault code No. 29 Symptom Decompression solenoid (thermistor): open or short cir-
cuit 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 
(thermistor) coupler
Main wire harness ECU couplerCheck the coupler for any pins 
that may be...

FUEL INJECTION SYSTEM
7-51
Fault  code  No. 33 Symptom Malfunction detected in the primary wire of the cylinder-#1 
left or right ignition coil.
Diagnostic code No. 30, 32 Cylinder-#1 left or right ignition coil
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Cylinder-#1 left or right ignition coil 
connector (primary coil side)
Main wire harness ECU coupler
Sub-wire harness 1 couplerCheck the connector and 
coupler for any pins that may be...

FUEL INJECTION SYSTEM
7-52
Fault  code  No. 34 Symptom Malfunction detected in the primary wire of the cylinder-#2 
left ignition coil.
Diagnostic code No. 31 Cylinder-#2 left ignition coil
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Cylinder-#2 left ignition coil 
connector (primary coil side)
Main wire harness ECU couplerCheck the connector and 
coupler for any pins that may be 
pulled out.
Check the locking condition of 
the connector and...

FUEL INJECTION SYSTEM
7-53
Fault  code  No. 35 Symptom Malfunction detected in the primary wire of the cylinder-#1 
left or right ignition coil.
Diagnostic code No. 30, 32 Cylinder-#1 left or right ignition coil
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Cylinder-#1 left or right ignition coil 
connector (primary coil side)
Main wire harness ECU coupler
Sub-wire harness 1 couplerCheck the connector and 
coupler for any pins that may be...

FUEL INJECTION SYSTEM
7-54
Fault  code  No. 36 Symptom Malfunction detected in the primary wire of the cylinder-#2 
right ignition coil.
Diagnostic code No. 33 Cylinder-#2 right ignition coil
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Cylinder-#2 right ignition coil 
connector (primary coil side)
Main wire harness ECU couplerCheck the connector and 
coupler for any pins that may be 
pulled out.
Check the locking condition of 
the connector...

FUEL INJECTION SYSTEM
7-55
Fault code No. 37 Symptom Engine speed is high when the engine is idling.
Diagnostic code No. 54 ISC valve
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 ECU fuse is blown.Check the ECU fuse.
Refer to “CHECKING THE 
FUSES” on page 7-93.ISC valve 
returns to its 
original position 
by turning the 
main switch to 
“ON” and back 
to “OFF”.
Reinstated if 
the engine idle 
speed is within 
specification 
after starting 
the engine. 2...