Yamaha Tenere 700 2020, Service Manual

Page: 377 / 472

FUEL INJECTION SYSTEM
8-66
B-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. This operation
takes approximately 6 seconds. 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.
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). Improperly connected
→
Con-
nect the coupler securely or re-
place the sub-wire harness.
Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard
→
Go to item B-9.
ISC operating sound is not
heard
→
Go to item B-3.
B-3 Connection of sub-wire har-
ness 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). Improperly connected
→
Con-
nect the coupler securely or re-
place the sub-wire harness.
Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard
→
Go to item B-9.
ISC operating sound is not
heard
→
Go to item B-4.
B-4 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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard
→
Go to item B-9.
ISC operating sound is not
heard
→
Go to item B-5.
B-5 Wire harness and/or sub-wire
harness continuity. Open or short circuit
→
Replace
the wire harness and/or sub-
wire harness.
Between ISC (idle speed con-
trol) unit coupler and sub-wire
harness coupler.
red/green–red/green
pink/blue–pink/blue
white/green–white/green
brown/blue–brown/blue
Between sub-harness and ECU
coupler.
red/green–red/green
pink/blue–pink/blue
white/green–white/green
brown/blue–brown/blue
Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard
→
Go to item B-9.
ISC operating sound is not
heard
→
Go to item B-6.
B-6 Installed condition of ISC (idle
speed control) unit. Check for looseness or pinch-
ing.
Improperly installed ISC (idle
speed control) unit
→
Reinstall
the ISC (idle speed control) unit.
Check the intake air passages
for air leaks.
Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard
→
Go to item B-9.
ISC operating sound is not
heard
→
Go to item B-7.
B-7 ISC valve is not moving correct-
ly. Replace the ISC valve.
Refer to “Cleaning the ISC (idle
speed control) valve” on page
7-10. Execute the diagnostic mode.
(Code No. 54)
ISC operating sound is heard
→
Go to item B-9.
ISC operating sound is not
heard
→
Go to item B-8.