Yamaha Waverunner VXS VX1800, Service Manual

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Technical tips
Engine control system
Item Condition Action Remarks
Overheat
warning con-
trol
• Engine temperature
rises rapidly in a
short time.
• Thermo switch is on.
• Exhaust cooling wa-
ter temperature ex-
ceeds 75 °C (167
°F).
• Opening angle of the ETV
is regulated.
• Maximum engine speed is
limited to approximately
3000–3300 r/min.
Cancel:
• Stop the engine and wait
for 30 seconds or more.
• Engine temperature is
below 140 °C (248 °F)
with the thermo switch
off.
• Exhaust cooling water
temperature is below 70
°C (158 °F) with the ETV
fully closed.
If the engine is stopped
during overheat warning
control, it can be restarted.
Oil pressure
warning con-
trol
Control is activated
when all of the follow-
ing conditions are
present:
• Oil pressure switch is
on.
• ETV is open.
• Engine speed ex-
ceeds 4500 r/min.
• Opening angle of the ETV
is regulated.
• Maximum engine speed is
limited to approximately
3000–3300 r/min.
Cancel:
• Stop the engine and wait
for 30 seconds or more.
• Engine is restarted and
the oil pressure switch is
off.
If the engine is stopped
during oil pressure warn-
ing control, it can be re-
started.
Cam position
sensor failure
control
Control is activated
when the following
conditions are main-
tained for 10 seconds:
• Cam position sensor
failed.
• Engine speed ex-
ceeds approximate-
ly 1000 r/min.
• Opening angle of the ETV
is regulated.
• Maximum engine speed is
limited to approximately
3000–3300 r/min.
Cancel:
Engine is stopped.
Control is activated
when all of the follow-
ing conditions are
present:
• Cam position sensor
failed.
• Engine speed ex-
ceeds 5000 r/min.
Ignition and fuel injection
are cut to all cylinders and
the engine is stopped.
If the engine is stopped
during cam position sensor
failure control, it can be re-
started.