7-24
E
–
+
ELEC
IGNITION SYSTEM
THROTTLE POSITION SENSOR
1. Measure:
• Throttle position sensor output voltage
Out of specification
→
Replace the
throttle body assembly.
Checking steps:
CAUTION:
Do not loosen the throttle stop screw nut
and do not turn the throttle stop screw.
• Connect a computer to the watercraft and
use the Yamaha Diagnostic System to
display the “throttle position sensor 1 out-
put voltage”, “throttle valve opening
angle”, and “throttle position sensor 2
output voltage”.
• Release the throttle lever to the fully
closed position.
• Check the output voltage of throttle posi-
tion sensor 1 and the throttle valve open-
ing angle.
1
Throttle position sensor 1
2
Throttle position sensor 2
È
Throttle position sensor output voltage
É
Throttle valve opening angle
Ê
Fully closed
Ë
Fully open
NOTE:
The actual throttle position sensor output
voltage and throttle valve opening angle
may vary according to environmental condi-
tions.
Throttle position sensor 1 output
voltage with throttle lever fully
closed:
0.45–0.95 V (reference data)
Throttle valve opening angle with
throttle lever fully closed:
–1.1–9.4° (reference data)
2
±
0.1 V
0.5
±
0.05 V
4.65
±
0.05 V
(4.5 V)
(10˚)
É
Ê
Ë
È
1
2
