Yamaha Mt 01 T 2005 Manual

FUEL INJECTION SYSTEM
7-36
Sensor operation tableEr-4Non-registered data has 
been received from the 
meter.Improper connection in wire harness.
Malfunction in meter.
Malfunction in ECU.—
Diag-
nostic 
code 
No.Item Meter display Checking method
01 Throttle angle
Fully closed position 15–20 Check with throttle fully 
closed.
Fully opened position 95–100 Check with throttle fully 
open.
03 Pressure difference
(atmospheric pressure and 
cylinder-#1 intake air 
pressure)Displays the cylinder-#1 
intake...

FUEL INJECTION SYSTEM
7-37
11 Engine temperature Displays the engine 
temperature.Compare the actually 
measured engine 
temperature with the meter 
display value.
12 Muffler cooling fan 
temperatureDisplays the muffler cooling 
fan temperature.Compare the actually 
measured muffler cooling 
fan temperature with the 
meter display value.
20 Sidestand switch Set ON/OFF the Sidestand 
switch. (with the 
transmission in gear.) Stand retracted ON
Stand extended OFF
21 Neutral switch Shift the...

FUEL INJECTION SYSTEM
7-38
Actuator operation table63 Stopping the flashing of the 
engine trouble warning light 
(erasing the muffler cooling 
fan temperature sensor 
fault code)00 To stop the flashing of the 
engine trouble warning 
light, set the engine stop 
switch to “”.
70 Control number 0–255—
Diag-
nostic 
code 
No.Item Actuation Checking method
30Cylinder-#1 left or right 
ignition coilActuates the cylinder-#1 left 
or right ignition coil for five 
times every second.
Illuminates the engine...

FUEL INJECTION SYSTEM
7-39
EAS27460
TROUBLESHOOTING DETAILS
This section describes the measures per fault code number displayed on the meter. Check and service 
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 ac-
cording to the reinstatement method.
Fault code No.:50 Fuel pump relayActuates the fuel pump relay 
for five times every second.
Illuminates the...

FUEL INJECTION SYSTEM
7-40
Code number displayed on the meter when the engine failed to work normally. Refer to “Self-Diagnos-
tic Function table”.
Diagnostic code No.:
Diagnostic code number to be used when the diagnostic mode is operated. Refer to “DIAGNOSTIC 
MODE” on page 7-31.
Fault code No. 12 Symptom No normal signals are received from the crankshaft posi-
tion sensor.
Diagnostic code No.——
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Installed...

FUEL INJECTION SYSTEM
7-41
Fault code No. 13 Symptom Cylinder-#1 intake air pressure sensor: open or short cir-
cuit detected.
Diagnostic code No. 03 Cylinder-#1 intake air pressure sensor
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Cylinder-#1 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
7-42
Fault code No. 14 Symptom Cylinder-#1 intake air pressure sensor: hose system mal-
function (clogged or detached hose).
Diagnostic code No. 03 Cylinder-#1 intake air pressure sensor
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Cylinder-#1 intake air pressure sensor 
hoseCheck the cylinder-#1 intake air 
pressure sensor hose condition.
Repair or replace the sensor 
hose.Starting the 
engine and 
operating it at 
idle.
2 Cylinder-#1...

FUEL INJECTION SYSTEM
7-43
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 
causeCheck or maintenance job Reinstatement 
method
1 Installed condition of throttle position 
sensor.Check for looseness or 
pinching.
Check that the sensor is 
installed in the specified 
position.Turning the 
main switch to 
“ON”.
2 Connections
Throttle position sensor coupler
Main wire harness ECU...

FUEL INJECTION SYSTEM
7-44
Fault code No. 17 Symptom EXUP servo motor circuit: open or short circuit detected.
Diagnostic code No. 53 EXUP servo motor
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
EXUP servo motor 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.Turning the 
main switch...

FUEL INJECTION SYSTEM
7-45
Fault code No. 19 Symptom A break or disconnection of the blue/yellow lead of the 
ECU is detected.
Diagnostic code No. 20 Sidestand switch
Order Item/components and probable 
causeCheck or maintenance job Reinstatement 
method
1 Connections
Main wire harness ECU couplerExecute the diagnostic mode. 
(Code No.20)
Check 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...