Self-Diagnostic Function Table - Yamaha 2009 XP500Y TMAX Service Manual

a. Main switch "OFF"
b. Main switch "ON"
c. Engine trouble warning light off
EAS4B51034

SELF-DIAGNOSTIC FUNCTION TABLE

If the ECU (engine control unit) detects an abnormal signal from a sensor while the vehicle is being driv-
en, the ECU (engine control unit) illuminates 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 (engine control unit) processes the spec-
ified 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 condi-
tions.
The ECU (engine control unit) takes fail-safe actions in two ways: one in which the sensor output is set
to a prescribed value, and the other in which the ECU (engine control unit) directly operates an actuator.
Details on the fail-safe actions are given in the table below.
Self-Diagnostic Function table
Fault
Item
code No.
Crankshaft position
12
sensor
Intake air pressure
13 sensor
(open or short circuit)
Intake air pressure
14 sensor
(pipe system)
Throttle position sen-
15 sor
(open or short circuit)
Throttle position sen-
16 sor
(stuck)
Sidestand switch
(open circuit wire har-
19
ness to ECU (engine
control unit))
a b
c d
d. Engine trouble warning light on for 1.4
Symptom
No normal signals are received
from the crankshaft position sen-
sor.
Intake air pressure sensor-open or
short circuit detected.
Intake air pressure sensor-pipe
system malfunction (clogged or
detached hose).
Throttle position sensor-open or
short circuit detected.
The throttle position sensor is
stuck.
Open circuit is detected in the in-
put line from the sidestand switch
to the ECU (engine control unit).
8-32
FUEL INJECTION SYSTEM
c
seconds
Able / un-
able to start
Unable
Able
Able
Able
Able
Unable
Able / un-
able to
drive
Unable
Able
Able
Able
Able
Unable