Yamaha Star XVS13AA(C) 2011 Service Manual page 479

Fault code No. 37
Diagnostic code No.
Order Item/components and probable
cause
A-1 Incorrect speed sensor signal.
A-2 Throttle valve does not fully close.
A-3 ISC valve is not moving correctly.
B-1 Installed condition of ISC (idle speed
control) unit
B-2 Connections
• ISC (idle speed control) unit coupler
• Wire harness ECU coupler
B-3 Open or short circuit in wire harness
and/or injector sub-wire harness.
B-4 ISC valve is not moving correctly.
Symptom Engine speed is high when the engine is idling.
A 54 Component other than ISC (idle speed control) unit is de-
fective (ISC operating sound is heard).
B 54 Defective ISC (idle speed control) unit (ISC operating
sound is not heard).
Check or maintenance job
• Replace if defective.
• Check the throttle bodies. Refer
• Check the throttle cables.
• Replace the throttle body as-
• Check for looseness or pinch-
• Check the coupler for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Repair or replace if there is an
• Between ISC (idle speed con-
• Replace the throttle body as-
8-72
FUEL INJECTION SYSTEM
Refer to "CHECKING THE
SPEED SENSOR" on page
8-112.
to "THROTTLE BODIES" on
page 7-9.
Refer to "ADJUSTING THE
THROTTLE CABLE FREE
PLAY" on page 3-8.
sembly.
ing.
that may be pulled out.
the coupler.
and connect the coupler se-
curely.
open or short circuit.
trol) unit coupler and ECU cou-
pler.
(red/green–violet/green)
(pink/blue–pink)
(white/green–white/blue)
(brown/blue–yellow)
sembly.
Reinstatement
method
Start the en-
gine and let it
idle for approxi-
mately 10 sec-
onds.
Start the en-
gine and let it
idle for approxi-
mately 10 sec-
onds.