Yamaha XV19SX(C) Service Manual page 426

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