Yamaha MBK X-MAX 300 2017, Service Manual

Page: 342 / 462

FUEL INJECTION SYSTEM
8-37
Procedure
Operate the throttle while pulling the brake lever and pushing the “ ”
side of the start/engine stop switch. (If the display value changes, the
performance is OK.)
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
1 Connection of throttle body sen-
sor assembly 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.
Turn the main switch to “ON”,
and then check the condition of
the fault code using the mal-
function mode of the Yamaha di-
agnostic tool.
Condition is “Recover”
→
Go to
item 7 and finish the service.
Condition is “Malfunction”
→
Go
to item 2.
2 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.
Turn the main switch to “ON”,
and then check the condition of
the fault code using the mal-
function mode of the Yamaha di-
agnostic tool.
Condition is “Recover”
→
Go to
item 7 and finish the service.
Condition is “Malfunction”
→
Go
to item 3.
3 Wire harness continuity. Open or short circuit
→
Replace
the wire harness.
Turn the main switch to “ON”,
and then check the condition of
the fault code using the mal-
function mode of the Yamaha di-
agnostic tool.
Condition is “Recover”
→
Go to
item 7 and finish the service.
Condition is “Malfunction”
→
Go
to item 4.
3-1
1. Throttle body sensor assembly
2. Intake air pressure sensor
3. ECU
4. Sensor input lead
5. Sensor output lead
6. Sensor ground lead
3-2 Disconnect the ECU coupler from the ECU.
Disconnect the throttle body sensor assembly coupler from the throttle body.
Fault code No. P0107, P0108
Item
No normal signals are received from the intake air pressure sensor.
[P0107] Intake air pressure sensor: open or ground short circuit de-
tected.
[P0108] Intake air pressure sensor: open or power short circuit de-
tected.
5V
5V
1
2
3
4
5
6
L
Y
P / W
B / L
Br / W
L
Y
P / W
B / L
Br / W