Yamaha 2016 Grizzly yf700gg, Service Manual

Page: 401 / 474

FUEL INJECTION SYSTEM
9-46
Fault code No. 37
TIP
• If fault code numbers “16” and “37” are both indicated, take the actions specified for fault code number
“16” first.
• If fault code numbers “21” and “37” are both indicated, take the actions specified for fault code number
“21” first.
• If fault code numbers “22” and “37” are both indicated, take the actions specified for fault code number
“22” first.
• 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.
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 operation takes approximately 3 seconds.
The “CHECK” indicator and “
” on the Yamaha diagnostic tool screen
come on during the operation.
Procedure The operating sound can be heard when ISC valve operates.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
A-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 A-2.
ISC operating sound is not
heard
→
Go to item B-2 for the
defective ISC (Idle Speed Con-
trol) unit.
A-2 Incorrect speed sensor signal. Check the speed sensor.
Execute the diagnostic mode.
(Code No. 07)
Rotate the rear wheel by hand
and check that the indicated
value increases.
Value does not increase
→
Go
to fault code No. 42.
Start the engine and let it idle
for approximately 10 seconds.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item A-3.
A-3 Throttle valve does not fully
close. Check the throttle body.
Refer to “THROTTLE BODY” on
page 7-4.
Check the throttle cable.
Refer to “ADJUSTING THE
THROTTLE LEVER FREE
PLAY” on page 3-33. Start the engine and let it idle
for approximately 10 seconds.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item A-4.