Yamaha ROADLINER XV19SW, Service Manual

Page: 380 / 444

FUEL INJECTION SYSTEM
7-36
36
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
37
Engine speed is high when
the engine is idling.
• 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.
54
41
Lean angle sensor: open or
short circuit detected.
• Open or short circuit in wire harness.
• Defective lean angle sensor.
• Malfunction in ECU.
08
42
No normal signals are re-
ceived from the speed sen-
sor.
Open circuit is detected in
the neutral switch.
• 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.
07
21
43
The ECU is unable to moni-
tor the battery voltage (an
open or short circuit in the
line to the ECU).
• Open or short circuit in wire harness.
• Malfunction in ECU.
09
44
Error is detected while
reading or writing on EE-
PROM (CO adjustment val-
ue).
• Malfunction in ECU. (The CO adjustment
value is not properly written on or read from
the internal memory). 60
46
Power supply to the fuel in-
jection system is not nor-
mal.
Malfunction in the charging system. Refer to
“CHARGING SYSTEM” on page 7-13.
—
50
Faulty ECU memory.
(When this malfunction is
detected in the ECU, the
fault code number might
not appear on the meter.)
• Malfunction in ECU. (The program and data
are not properly written on or read from the
internal memory.) —
Er-1
No signals are received
from the ECU.
• Open or short circuit in wire harness.
• Malfunction in meter.
• Malfunction in ECU.
• Defective wire connection of the ECU cou-
pler.
—
Fault
code
No.
Symptom Probable cause of malfunction
Diagnostic
code No.