Engine Control System - Yamaha GX1800A Service Manual

Engine control system

Item
Overheat • Engine temperature
warning con- rises rapidly in a
trol short time.
• Thermo switch is on.
• Exhaust cooling
water temperature
exceeds 65 °C
(149 °F).
Oil pressure Control is activated
warning con- when all of the follow-
trol ing conditions are
present:
• Oil pressure switch
is on.
• ETV is open.
• Engine speed
exceeds 4500 r/min.
Cam position Control is activated
sensor failure when the following
control conditions are main-
tained for 10 seconds:
• Cam position sensor
failed.
• Engine speed
exceeds approxi-
mately 1000 r/min.
Control is activated
when all of the follow-
ing conditions are
present:
• Cam position sensor
failed.
• Engine speed
exceeds 5000 r/min.
Condition
• Opening angle of the ETV
is regulated.
• Maximum engine speed is
limited to approximately
2100–2300 r/min.
• Opening angle of the ETV
is regulated.
• Maximum engine speed is
limited to approximately
2100–2300 r/min.
• Opening angle of the ETV
is regulated.
• Maximum engine speed is
limited to approximately
2100–2300 r/min.
Ignition and fuel injection
are cut to all cylinders and
the engine is stopped.
Action
10
Technical tips
Remarks
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.
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 warning
control, it can be restarted.
Cancel:
Engine is stopped.
Cancel:
Engine is stopped.