Yamaha XVS950CU 2014, Service Manual

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FUEL INJECTION SYSTEM
7-63
TIP
• Do not remove the ISC (idle speed control) valve.
• If fault code numbers “37” and “46” are both indicated, take the actions specified for fault code number
“46” first.
• If fault code numbers “37” and “42” are both indicated, take the actions specified for fault code number
“42” first.
4 ISC valve is not moving cor-
rectly. Replace the throttle body as-
sembly. Start the engine and let it idle
for approximately 10 sec-
onds.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 5.
5 Malfunction in ECU. Replace the ECU.
Fault code No. 37
Item
A
Component other than ISC (idle speed control) unit is defective
(ISC operating sound is heard).
B
Defective ISC (idle speed control) unit (ISC operating
sound is not heard).
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 54
Actuation
Fully closes the ISC valve, and then opens the valve. This opera-
tion is performed 3 times and takes approximately 4 seconds each
time. The “CHECK” indicator and “
” on the Yamaha diagnostic
tool screen comes on during the operation.
Procedure The ISC unit vibrates when the ISC valve operates.
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Locate the malfunction. Execute the diagnostic
mode. (Code No. 54)
Fully closes the ISC (idle
speed control) valve, and
then fully opens the valve. ISC operating sound is heard
→
Go to item 2 in section A
for the component other than
ISC (idle speed control) unit
is defective.
ISC operating sound is not
heard
→
Go to item 2.
Fault code No. 37
Item
A
Component other than ISC (idle speed control) unit is de-
fective (ISC operating sound is heard).
B
Defective ISC (idle speed control) unit (ISC operating sound is
not heard).