Yamaha FZ8NA Service Manual page 457

Fault code No.
Item
Fail-safe system
Diagnostic code No.
Meter display
Procedure
Item/components and
probable cause
6 Supply voltage of throttle
position sensor lead
7 Throttle position sensor mal-
function
8 ECU malfunction
TIP
If fault codes 15 and 16 are indicated simultaneously, take the actions specified for fault code 15
first.
15
Throttle position sensor: open or short circuit detected. (no normal
signals are received from the throttle position sensor.)
Able to start engine
Able to drive vehicle
d:01
Throttle position sensor
• 14–20 (fully closed position)
• Check with throttle valves fully closed.
• Check with throttle valves fully open.
Check or maintenance job
Check the supply voltage.
Black/blue–Yellow
Refer to "CHECKING THE
THROTTLE POSITION SEN-
SOR" on page 8-199.
Line discon-
nection points
Disconnec-
tion of ground
lead
Disconnec-
tion of output
line
Disconnec-
tion of power
supply line
Check the diagnostic mode
(Code No. d01).
When throttle is fully closed:
A value of 14–20 is indicated.
If the indication is outside of
range: Replace the throttle
position sensor.
Replace the ECU.
FUEL INJECTION SYSTEM
Output volt-
age
5 V
0 V
0 V
8-62
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.