Yamaha Tenere 700 2020, Service Manual

Page: 390 / 472

FUEL INJECTION SYSTEM
8-79
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). Improperly connected
→
Con-
nect the coupler securely or re-
place the wire harness.
Start the engine and let it idle for
approximately 10 seconds.
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is “Recover”
→
Go to
item 8 and finish the service.
Condition is “Malfunction”
→
Go
to item 4.
Also, delete this fault code,
which has a condition of “Mal-
function”.
4 Wire harness continuity. Open or short circuit
→
Replace
the wire harness.
Between O
2
sensor coupler and
ECU coupler.
gray/green–gray/green
pink/black–pink/black
Between O
2
sensor coupler and
joint coupler.
black/blue–black/blue
red/white–red/white
Between joint coupler and ECU
coupler.
black/blue–black/blue
Between joint coupler and igni-
tion fuse.
red/white–red/white
Start the engine and let it idle for
approximately 10 seconds.
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is “Recover”
→
Go to
item 8 and finish the service.
Condition is “Malfunction”
→
Go
to item 5.
Also, delete this fault code,
which has a condition of “Mal-
function”.
5 Check fuel pressure. Refer to “CHECKING THE
FUEL PRESSURE” on page
7-12. Start the engine and let it idle for
approximately 10 seconds.
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is “Recover”
→
Go to
item 8 and finish the service.
Condition is “Malfunction”
→
Go
to item 6.
Also, delete this fault code,
which has a condition of “Mal-
function”.
6 Defective O
2
sensor. Check the O
2
sensor.
Replace if defective.
Refer to “ENGINE REMOVAL”
on page 5-3.
Start the engine and let it idle for
approximately 10 seconds.
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is “Recover”
→
Go to
item 8 and finish the service.
Condition is “Malfunction”
→
Go
to item 7.
Also, delete this fault code,
which has a condition of “Mal-
function”.
7 Malfunction in ECU. Replace the ECU.
Refer to “REPLACING THE
ECU (engine control unit)” on
page 8-130. Service is finished.