Yamaha XV19SX(C) Service Manual page 427

Fault
code Symptom
No.
Malfunction detected in the
primary wire of the cylin-
36
der-#2 left or right ignition
coil.
Engine speed is high when
37
the engine is idling.
Lean angle sensor: open or
41
short circuit detected.
No normal signals are re-
ceived from the speed sen-
42 sor.
Open circuit is detected in
the neutral switch.
The ECU is unable to moni-
tor the battery voltage (an
43
open or short circuit in the
line to the ECU).
Error is detected while
reading or writing on EE-
44
PROM (CO adjustment val-
ue).
Power supply to the fuel in-
46 jection system is not nor-
mal.
Faulty ECU memory.
(When this malfunction is
50 detected in the ECU, the
fault code number might
not appear on the meter.)
FUEL INJECTION SYSTEM
Probable cause of malfunction
• 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 circuit in wire harness.
• Malfunction in throttle body.
• Malfunction in throttle cables.
• ISC valve is stuck fully open due to discon-
nected ISC unit hose or coupler. (High en-
gine idle speed is detected with the ISC
valve stuck fully open even though signals
for the valve to close are continuously being
transmitted by the ECU.)
• Malfunction in ECU.
• ECU fuse is blown. (for XV19S(C)/
XV19M(C)/ XV19CTS(C)/ XV19CTM(C))
• Open or short circuit in wire harness.
• Defective lean angle sensor.
• Malfunction in ECU.
• Open circuit in wire harness.
• Defective speed sensor.
• Malfunction in vehicle speed sensor detect-
ed.
• Defective neutral switch.
• Malfunction in the engine side of the neutral
switch.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Malfunction in ECU.
• Malfunction in ECU. (The CO adjustment
value is not properly written on or read from
the internal memory).
Malfunction in the charging system. Refer to
"CHARGING SYSTEM" on page 7-13.
• Malfunction in ECU. (The program and data
are not properly written on or read from the
internal memory.)
7-36
Diagnostic
code No.
31
33
54
08
07
21
09
60
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