Yamaha MT-01 T 2005 Service Manual page 348

Fault
code Symptom
No.
Cylinder-#1 intake air
pressure sensor: hose
14 system malfunction
(clogged or detached
hose).
Throttle position sensor:
15 open or short circuit
detected.
EXUP servo motor circuit:
17 open or short circuit
detected.
18 EXUP servo motor is stuck.
A break or disconnection of
19 the blue/yellow lead of the
ECU is detected.
Air temperature sensor:
22 open or short circuit
detected.
No normal signal is
received from the O
24
sensor.
Cylinder-#2 intake air
25 pressure sensor: open or
short circuit detected.
Cylinder-#2 intake air
pressure sensor: hose
26 system malfunction
(clogged or detached
hose).
Engine temperature
28 sensor: open or short
circuit detected.
Decompression solenoid
29 (thermistor): open or short
circuit detected.
The vehicle has
30
overturned.
Probable cause of malfunction
• Cylinder-#1 intake air pressure sensor hose
is detached, clogged, kinked, or pinched.
• Malfunction in ECU.
• Open or short circuit in wire sub lead.
• Open or short circuit in wire harness.
• Defective throttle position sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.
• Open or short circuit in wire harness.
• Defective EXUP servo motor
(potentiometer circuit).
• Open or short circuit in wire harness.
• Stuck EXUP servo motor (mechanism).
• Stuck EXUP servo motor (motor).
• Open circuit in wire harness (ECU coupler).
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective air temperature sensor.
• Malfunction in ECU.
• Improperly installed air temperature sensor.
• Open or short circuit in wire harness.
• Defective O
2
• Malfunction in ECU.
• Improperly installed sensor.
• Open or short circuit in wire harness.
• Defective cylinder-#2 intake air pressure
sensor.
• Malfunction in ECU.
• Cylinder-#2 intake air pressure sensor hose
is detached, clogged, kinked, or pinched.
• Malfunction in ECU.
• Open or short circuit in wire sub lead.
• Open or short circuit in wire harness.
• Defective engine temperature sensor.
• Malfunction in ECU.
• Improperly installed sensor.
• Open or short circuit in wire harness.
• Defective decompression solenoid
(thermistor).
• Malfunction in ECU.
• Improperly installed sensor.
• Overturned.
• Malfunction in ECU.
7-33
FUEL INJECTION SYSTEM
sensor.
2
Diagnostic
code No.
03
01
53
53
20
05
—
04
04
11
55
08