Yamaha FJR13AG Service Manual page 585

Fault code No.
Item
2 Connection of wire harness
ECU coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
3 Check the electronic throttle
valve fuse.
4 Wire harness continuity.
5 Defective throttle servo motor.
6 Defective throttle bodies.
7 Malfunction in ECU.
8 Delete the fault code and check
that the engine trouble warning
light goes off.
P0638
YCC-T drive system: malfunction detected.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Abnormality → Replace the
electronic throttle valve fuse.
Open or short circuit → Replace
the wire harness.
Between electronic throttle
valve fuse and ECU coupler.
red/blue–red/blue
Between throttle servo motor
coupler and ECU coupler.
light green/red–light green/red
yellow/red–yellow/red
Check the throttle servo motor.
Replace the throttle bodies if
defective.
Refer to "CHECKING THE
THROTTLE SERVO MOTOR"
on page 8-264.
Check the throttle bodies.
Replace if defective.
Refer to "CHECKING THE
THROTTLE SERVO MOTOR"
on page 8-264.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-250.
Confirm that the fault code has
a condition of "Recovered" us-
ing the Yamaha diagnostic tool,
and then delete the fault code.
8-108
FUEL INJECTION SYSTEM
Turn the main switch to "ON",
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is "Recovered" → Go
to item 8 and finish the service.
Condition is "Detected" → Go to
item 3.
Turn the main switch to "ON",
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is "Recovered" → Go
to item 8 and finish the service.
Condition is "Detected" → Go to
item 4.
Turn the main switch to "ON",
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is "Recovered" → Go
to item 8 and finish the service.
Condition is "Detected" → Go to
item 5.
Turn the main switch to "ON",
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is "Recovered" → Go
to item 8 and finish the service.
Condition is "Detected" → Go to
item 6.
Turn the main switch to "ON",
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is "Recovered" → Go
to item 8 and finish the service.
Condition is "Detected" → Go to
item 7.
Service is finished.