Self-Diagnostic Function Table - Yamaha MT-01 T 2005 Service Manual

a. Main switch "OFF"
b. Main switch "ON"
c. Engine trouble warning light off
EAS27380

SELF-DIAGNOSTIC FUNCTION TABLE

If the ECU detects an abnormal signal from a sensor while the vehicle is being driven, the ECU illumi-
nates the engine trouble warning light and provides the engine with alternate operating instructions that
are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that are
programmed for each sensor in order to provide the engine with alternate operating instructions that
enable the engine to continue to operate or stop operating, depending on the conditions.
Self-Diagnostic Function table
Fault
code No.
Crankshaft position
12
sensor
Cylinder-#1 intake air
13 pressure sensor
(open or short circuit)
Cylinder-#1 intake air
14 pressure sensor
(hose line)
Throttle position
15 sensor
(open or short circuit)
EXUP servo motor
17 circuit
(open or short circuit)
EXUP servo motor
18
(lock)
Blue/yellow ECU lead
19 (broken or
disconnected)
Air temperature
22 sensor
(open or short circuit)
a
b
c
Item
No normal signals are received
from the crankshaft position
sensor.
Cylinder-#1 intake air pressure
sensor: open or short circuit
detected.
Cylinder-#1 intake air pressure
sensor: hose system malfunction
(clogged or detached hose).
Throttle position sensor: open or
short circuit detected.
EXUP servo motor circuit: open or
short circuit detected.
EXUP servo motor is stuck.
A break or disconnection of the
blue/yellow lead of the ECU is
detected.
Air temperature sensor: open or
short circuit detected.
FUEL INJECTION SYSTEM
c
d
d. Engine trouble warning light on for 1.4
seconds
Symptom
7-28
Able / un-
Able / un-
able to
able to start
drive
Unable Unable
Able Able
Able Able
Able Able
Able Able
Able Able
Unable Unable
Able Able