Fault Code 48 - Yamaha FZ8NA Service Manual

Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuation
Procedure
Item/components and
probable cause
1 Installation status of sub-
throttle position sensor
2 Connection of sub-throttle
position sensor coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking).
Check in the diagnostic code
(Code No. d55). Check the
sub-throttle servo motor for
proper operation.
3 Connection of wire harness
ECU coupler
Check the connection of the
coupler is secure.
Remove the coupler, and
check each pin (for bending,
wear, or locking).
4 Sub-throttle servo motor mal-
function
48
Sub-throttle servo motor: stuck sub-throttle servo motor detected.
signal from sub-throttle position sensor will not change. (sub-throt-
tle servo motor will not start.)
Able to start engine
Able to drive vehicle
d:56
Sub-throttle valve will close and stops at standard position after
fully opened.
This operation takes about 3 seconds and engine trouble warning
light will be turning on during operation.
Check the operating sound of the sub-throttle servo motor.
Check or maintenance job
Check the mounting section
for a loose or pinched mount-
ing.
Poor connection → Connect it
securely, or repair/replace the
wire harness.
Poor connection → Connect it
securely, or repair/replace the
wire harness.
Check in the diagnostic mode
(Code No. d56).
No operation sound of sub-
throttle servo motor. →
Replace the sub-throttle
servo motor.
FUEL INJECTION SYSTEM
8-100
Sensor inspection proce-
dure
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.