Self-Diagnostic Function Table - Yamaha XV19SW Service Manual

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
Item
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 system)
Throttle position sen-
15 sor
(open or short circuit)
EXUP servo motor
17 circuit
(open or short circuit)
EXUP servo motor
18
(lock)
Blue/black ECU lead
19 (broken or discon-
nected)
Air temperature sen-
22 sor
(open or short circuit)
O sensor
24
2
Cylinder-#2 intake air
25 pressure sensor
(open or short circuit)
Cylinder-#2 intake air
26 pressure sensor
(hose system)
Engine temperature
28 sensor
(open or short circuit)
Lean angle sensor
30
(latch up detected)
FUEL INJECTION SYSTEM
Symptom
No normal signals are received
from the crankshaft position sen-
sor.
Cylinder-#1 intake air pressure
sensor: open or short circuit de-
tected.
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/black lead of the ECU is de-
tected.
Air temperature sensor: open or
short circuit detected.
No normal signal is received from
the O sensor.
2
Cylinder-#2 intake air pressure
sensor: open or short circuit de-
tected.
Cylinder-#2 intake air pressure
sensor: hose system malfunction
(clogged or detached hose).
Engine temperature sensor: open
or short circuit detected.
The vehicle has overturned.
7-30
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
Able Able
Able Able
Able Able
Able Able
Unable Unable