Yamaha YP400T Service Manual page 301

Diagnostic
Item
code
Fuel system voltage
09
(battery voltage)
Sidestand switch
20
Ignition coil
30
Fuel injector
36
Fuel injection system
relay
50
Radiator fan motor relay
51
Headlight relay 1
52
ISC (idle speed control)
valve
54
Grip warmer relay
57
EEPROM fault code dis-
play
60
FUEL INJECTION SYSTEM
Description of action
Displays the fuel system voltage (battery voltage).
Engine stop switch is on.
Displays that the switch is ON or OFF.
When the engine stop switch is turned from OFF to
ON, the ignition coil is actuated five times per sec-
ond and the engine trouble warning light comes on.
• Connect an ignition checker.
• If the engine stop switch is ON, turn it OFF, and
then turn it back ON.
When the engine stop switch is turned from OFF to
ON, the fuel injector is actuated five times per sec-
ond and the engine trouble warning light comes on.
• If the engine stop switch is ON, turn it OFF, and
then turn it back ON.
When the engine stop switch is turned from OFF to
ON, the fuel injection system relay is actuated five
times per second and the engine trouble warning
light comes on (the light is OFF when the relay is
ON, and the light is ON when the relay is OFF).
• If the engine stop switch is ON, turn it OFF, and
then turn it back ON.
When the engine stop switch is turned from OFF to
ON, the radiator fan motor relay is actuated five
times every 5 seconds and the engine trouble warn-
ing light comes on. (ON 2 seconds, OFF 3 seconds)
• If the engine stop switch is ON, turn it OFF, and
then turn it back ON.
When the engine stop switch is turned from OFF to
ON, the headlight relay is actuated five times every
5 seconds and the engine trouble warning light
comes on. (ON 2 seconds, OFF 3 seconds)
• If the engine stop switch is ON, turn it OFF, and
then turn it back ON.
When the engine stop switch is turned from OFF to
ON, the ISC (idle speed control) valve fully closes,
and then it opens until it is at the standby opening
position when the engine is started. This operation
takes approximately 12 seconds until it is com-
pleted.
• If the engine stop switch is ON, turn it OFF, and
then turn it back ON.
When the engine stop switch is turned from OFF to
ON, the grip warmer relay is actuated and the
engine trouble warning light comes on. (the light is
OFF when the relay is OFF, and the light is ON
when the relay is ON).
• If the engine stop switch is ON, turn it OFF, and
then turn it back ON.
• Transmits the abnormal portion of the data in the
EEPROM that has been detected as a fault code
44.
• If multiple malfunctions have been detected, differ-
ent codes are displayed at 2-second intervals, and
this process is repeated.
7 - 11
FI
Data displayed on meter
(reference value)
0 ~ 18.7 V
Normally, approximately 12.0 V
Stand retracted: ON
Stand extended: OFF
Check that spark is generated,
5 times with the engine stop switch
ON.
Check the operating sound of the fuel
injector five times with engine stop
switch ON.
Check the fuel injection system relay
operating sound 5 times with the
engine stop switch ON.
Check the radiator fan motor relay
operating sound 5 times with the
engine stop switch ON.
(At that time, the fan motor rotates.)
Check the headlight relay operating
sound 5 times with the engine stop
switch ON.
(At that time, the headlight turns ON.)
The ISC (idle speed control) valve
unit vibrates when the ISC (idle speed
control) valve operates.
Check the grip warmer relay operat-
ing sound 1 time with the engine stop
switch ON.
01 CO adjustment value is detected.
04 Throttle valve fully closed notifica-
tion value is detected.
(00) Displays when there is no mal-
function.