Yamaha N MAX GPD150-A 2015 Service Manual page 368

Fault code No.
Item
A-4 Air leak from the throttle body.
A-5 Air leak from the ISC (idle speed
control) unit.
A-6 The air volume for the throttle
body and ISC (idle speed con-
trol) unit is excessive.
A-7 ISC (idle speed control) unit is
not moving correctly.
A-8 Malfunction in ECU.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuation
Procedure
Probable cause of malfunc-
Item
tion and check
37
Component other than ISC (idle speed control) unit is defec-
A
tive (ISC operating sound is heard).
Defective ISC (idle speed control) unit (ISC operating sound is
B
not heard).
Check the throttle body.
Refer to "CHECKING THE
THROTTLE BODY" on page
7-12.
Improperly installed ISC (idle
speed control) unit → Reinstall
the ISC (idle speed control) unit.
Check the intake air passages
for air leaks.
Clean the throttle body and ISC
(idle speed control) unit.
Refer to "CLEANING THE ISC
(IDLE SPEED CONTROL) UNIT
AND THROTTLE BODY" on
page 7-12.
Replace the ISC (idle speed
control) unit.
Refer to "CLEANING THE ISC
(IDLE SPEED CONTROL) UNIT
AND THROTTLE BODY" on
page 7-12.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-99.
37
Component other than ISC (idle speed control) unit is defec-
A
tive (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 "
Yamaha diagnostic tool screen comes on during the operation.
The ISC unit vibrates when the ISC valve operates.
Maintenance job
8-43
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.
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-6.
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-7.
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-8.
Confirmation of service com-
" on the
pletion