Yamaha XV19SX(C), Service Manual

Page: 426 / 494

FUEL INJECTION SYSTEM
7-35
19
A break or disconnection of
the blue/black lead of the
ECU is detected.
• Open circuit in wire harness (ECU coupler).
• Malfunction in ECU.
20
22
Air temperature sensor:
open or short circuit detect-
ed.
• Open or short circuit in wire harness.
• Defective air temperature sensor.
• Malfunction in ECU.
• Improperly installed air temperature sensor.
05
24
No normal signal is re-
ceived from the O
2
sensor.
• Open or short circuit in wire harness.
• Defective O
2
sensor.
• Malfunction in ECU.
• Improperly installed sensor.
—
25
Cylinder-#2 intake air pres-
sure sensor: open or short
circuit detected.
• Open or short circuit in wire sub lead.
• Open or short circuit in wire harness.
• Defective cylinder-#2 intake air pressure
sensor.
• Malfunction in ECU.
04
26
Cylinder-#2 intake air pres-
sure sensor: hose system
malfunction (clogged or de-
tached hose).
• Cylinder-#2 intake air pressure sensor hose
is detached, clogged, kinked, or pinched.
• Malfunction in ECU.
04
28
Engine temperature sen-
sor: open or short circuit
detected.
• 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.
11
30
The vehicle has over-
turned. • Overturned.
• Malfunction in ECU.
08
33
Malfunction detected in the
primary wire of the cylin-
der-#1 left or right ignition
coil.
• Open or short circuit in wire harness.
• Malfunction in cylinder-#1 left or right igni-
tion coil.
• Malfunction in ECU.
• Malfunction in a component of ignition cut-
off circuit system.
30
32
34
Malfunction detected in the
primary wire of the cylin-
der-#2 left or right ignition
coil.
• Open or short circuit in wire sub lead.
• Open or short circuit in wire harness.
• Malfunction in cylinder-#2 left or right igni-
tion coil.
• Malfunction in ECU.
• Malfunction in a component of ignition cut-
off circuit system.
31
33
35
Malfunction detected in the
primary wire of the cylin-
der-#1 left or right ignition
coil.
• Open or short circuit in wire harness.
• Malfunction in cylinder-#1 left or right igni-
tion coil.
• Malfunction in ECU.
• Malfunction in a component of ignition cut-
off circuit system.
30
32
Fault
code
No.
Symptom Probable cause of malfunction
Diagnostic
code No.