Yamaha Waverunner VXS VX1800 Service Manual page 310

Symptom 1: Limited engine speed
Symptom 2
• Buzzer sounds in-
termittently
• Overheat warning
indicator blinks
• Check engine
warning indicator
blinks
• Buzzer sounds in-
termittently
• Oil pressure warn-
ing indicator blinks
Cause
Clogged cooling water pas-
sage
Thermostat malfunction
Engine temperature sen-
sor malfunction
Thermo switch malfunction
Thermo sensor malfunction
Insufficient engine oil
Oil pressure switch mal-
function
Checking step
Check the cooling water pilot outlet
for water discharge.
Check the water inlet strainer.
Check the cooling water passage.
Check the thermostat.
Measure the engine temperature
sensor resistance.
Check that there is no short circuit
between the black/yellow (B/Y) and
black/orange (B/O) engine tempera-
ture sensor leads.
Check the thermo switch for continu-
ity.
Check that there is no short circuit
between the pink (P) and black (B)
thermo switch leads.
Check the thermo sensor.
Check that there is no short circuit
between the black/blue (B/L) and
black/orange (B/O) thermo sensor
leads.
Check the engine oil level.
Check for engine oil leakage.
Check the oil passage.
Check the oil pressure switch conti-
nuity.
Check that there is no short circuit in
the pink/white (P/W) oil pressure
switch lead.
9-19
Engine unit troubleshooting
See
page
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3-3
1-33
5-21
7-16
A-2
7-15
A-2
7-16
A-2
3-4
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1-32
7-15
A-2