4-14
Outboard motor troubleshooting
Symptom 1: High engine idle speed
Symptom 1: Limited engine speed
Symptom 2 Cause Checking steps
See
page
—
Air leakage (throttle valve–cyl-
inder head)
Check the gaskets of the intake manifold
and throttle body.
6-34
Check the intake manifold for cracks. 6-38
Throttle link and throttle cable
are not installed properly.
Adjust the throttle link and throttle cable.
3-11
6-27
ISC valve malfunction
Check the ISC valve operation using the
YDIS.
5-15
Measure the ISC valve input voltage. 5-15
Symptom 2 Cause Checking steps
See
page
Buzzer comes on, over-
heat alert indicator
comes on
Clogged cooling water inlet
Check the pilot hole for cooling water dis-
charge.
10-5
Check the cooling water inlet. 10-8
Water pump impeller malfunc-
tion
Check the impeller. 8-11
Check the Woodruff key. 8-11
Check the insert cartridge. 8-11
Water leakage from water
pump housing
Check the water pump housing. 8-11
Check the outer plate cartridge. 8-11
Clogged cooling water pas-
sages
Check the cooling water passages. 2-16
PCV is open. Check the PCV. 7-50
Thermostat malfunction Check the thermostat. 7-50
Buzzer comes on, oil
pressure alert indicator
comes on
Insufficient engine oil
Check the oil level. 10-5
Check for engine oil leakage. 2-15
Check the valve seals and valves.
7-41
7-43
Check the piston rings. 7-64
Engine oil pressure decrease
Measure the oil pressure. 7-1
Check the oil pressure sensor. 5-16
Check the oil pump. 7-54
Check the oil strainer. 9-22
Check the oil passages (power unit and
oil pump).
2-15
Replace the oil filter. 7-56
— Y-COP malfunction
Check Y-COP for wiring harness continu-
ity.
5-30
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