Yamaha N MAX GPD150-A 2015, Service Manual

Page: 363 / 450

FUEL INJECTION SYSTEM
8-38
Fault code No. 21
TIP
Perform this procedure when the engine is cold.
1 Connection of sidestand switch
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 extend and retract the
sidestand.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
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 extend and retract the
sidestand.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 3.
3 Wire harness continuity. Open or short circuit
→
Replace
the wire harness.
Between ECU coupler and side-
stand switch coupler.
Blue/Yellow–Blue/Yellow
Turn the main switch to “ON”
and then extend and retract the
sidestand.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 4.
4 Defective sidestand switch. Execute the diagnostic mode.
(Code No. 20)
Sidestand retracted: “ON”
Sidestand extended: “OFF”
Replace if defective. Turn the main switch to “ON”,
and then extend and retract the
sidestand.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is displayed
→
Go to item 5.
5 Malfunction in ECU. Replace the ECU.
Refer to “REPLACING THE
ECU (engine control unit)” on
page 8-99.
Fault code No. 19
Item
Sidestand switch: a break or disconnection of the Blue/Yellow lead
of the ECU is detected.
Fault code No. 21
Item Coolant temperature sensor: open or short circuit detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 06
Tool display
When engine is cold: Displays temperature closer to air temperature.
When engine is hot: Displays current coolant temperature.
Procedure
Compare the actually measured coolant temperature with the computer
display value.
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion