Yamaha Waverunner VXS VX1800 Service Manual page 300

Diag-
nostic Item
code
Cam position
24
sensor
Air pressure
sensor
29
(Intake air pres-
sure sensor)
Slant detection
47
switch
APS full close
51
switch
Symptom
Engine speed is limited
Engine stalls
Trolling speed is unstable
Normal operation
Engine stalls
Trolling speed is unstable *1
Checking steps
Measure the cam position
sensor input voltage.
Check the orange (O),
green/orange (G/O), and
black/orange (B/O) cam posi-
tion sensor leads for continui-
ty.
Measure the cam position
sensor output voltage.
Check the intake air pressure
using the YDIS.
Measure the intake air pres-
sure sensor input voltage.
Check the orange (O),
pink/green (P/G), and
black/orange (B/O) intake air
pressure sensor leads for con-
tinuity.
Check the slant detection
switch operation using the
YDIS.
Measure the slant detection
switch input voltage.
Check the blue/black (L/B)
and black/orange (B/O) slant
detection switch leads for con-
tinuity.
Check the slant detection
switch for continuity.
Check the APS full close
switch operation using the
YDIS.
Measure the APS full close
switch input voltage.
Check the orange/green
(O/G), black/green (B/G), and
white/green (W/G) APS full
close switch leads for continui-
ty.
9-9
Engine unit troubleshooting
See
page
7-25
A-2
7-25
7-18
7-18
A-2
7-26
7-26
A-2
7-26
7-20
7-20
A-2