Yamaha XVS13AWC Service Manual page 377

Fault code No. 37
Diagnostic code No.
Order Item/components and probable
cause
1 Throttle valve does not fully close.
2 ISC valve is stuck fully open due to
disconnected ISC unit coupler. (High
engine idling 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.)
3 ISC valve is not moving correctly.
Symptom Engine speed is high when the engine is idling.
54 ISC valve
Check or maintenance job
• Check the throttle bodies.
• Check the throttle cables.
• Check that the ISC unit coupler
• The ISC valve is stuck fully
• Execute the diagnostic mode.
• After the ISC valve is fully
8-55
FUEL INJECTION SYSTEM
Refer to "THROTTLE BODIES"
on page 7-7.
Refer to "ADJUSTING THE
THROTTLE CABLE FREE
PLAY" on page 3-8.
is not disconnected.
open if it does not operate when
the main switch is turned to
"OFF".
(Touch the ISC unit with your
hand and check if it is vibrating
to confirm if the ISC valve is op-
erating.)
(Code No. 54)
closed, it opens to the standby
opening position when the en-
gine is started. This operation
takes approximately 12 sec-
onds. Start the engine. If the er-
ror recurs, replace the throttle
body assembly.
Reinstatement
method
ISC valve re-
turns to its orig-
inal position by
turning the
main switch to
"ON" and back
to "OFF".
Reinstated if
the engine
idling speed is
within specifi-
cation after
starting the en-
gine.