Yamaha 2016 Grizzly yfm700gplg Service Manual page 402

Fault code No.
Item
A-4 ISC valve is not moving correct-
ly.
A-5 Malfunction in ECU.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuation
Procedure
Probable cause of malfunc-
Item
tion and check
B-1 Locate the malfunction.
B-2 Connection of ISC (Idle Speed
Control) unit coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
B-3 Connection of ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
37
Component other than ISC (Idle Speed Control) unit is defective
A
(ISC operating sound is heard).
Defective ISC (Idle Speed Control) unit (ISC operating sound is
B
not heard).
Replace the throttle body as-
sembly.
Replace the ECU.
37
Component other than ISC (Idle Speed Control) unit is defective
A
(ISC operating sound is heard).
Defective ISC (Idle Speed Control) unit (ISC operating sound is
B
not heard).
Able to start engine
Able to drive vehicle
54
Fully closes the ISC valve, and then opens the valve.
This operation takes approximately 3 seconds.
The "CHECK" indicator and "
come on during the operation.
The operating sound can be heard when ISC valve operates.
Maintenance job
Execute the diagnostic mode.
(Code No. 54)
Fully closes the ISC (Idle Speed
Control) valve, and then fully
opens the valve.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
9-47
FUEL INJECTION SYSTEM
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-5.
" on the Yamaha diagnostic tool screen
Confirmation of service com-
ISC operating sound is heard →
Go to item A-2 for the compo-
nent other than ISC (Idle Speed
Control) unit is defective.
ISC operating sound is not
heard → Go to item B-2.
Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard →
Go to item B-8.
ISC operating sound is not
heard → Go to item B-3.
Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard →
Go to item B-8.
ISC operating sound is not
heard → Go to item B-4.
pletion