4-27
Outboard motor troubleshooting
Symptom 1: High engine idle speed.
Symptom 1: Engine stalls, unstable engine idle speed, or poor acceleration.
Symptom 1: Limited engine speed (below 2000–3000 r/min).
Symptom 2 Cause Checking steps
See
page
—
Air leakage (ETV–cylinder
head)
Check the gaskets of the intake
manifolds, surge tank, and ETV.
6-10
6-13
Symptom 2 Cause Checking steps
See
page
Improper intake cam
timing
Stuck OCV plunger
Check the OCV operation using the
YDIS.
5-28
Check the OCV plunger. 5-28
Clogged OCV filter Replace the OCV filter. 7-48
Clogged oil passage Check the oil passage. 2-41
Stuck VCT Replace the VCT assembly. 7-38
Symptom 2 Cause Checking steps
See
page
Buzzer comes on.
Overheat alert indica-
tor comes on.
Thermo sensor malfunction
Measure the thermo sensor input
voltage.
5-40
Check the thermo sensor for conti-
nuity.
5-40
Check for continuity between the
thermo sensor and the engine ECM.
A-12
Clogged cooling water inlet Check the cooling water inlet. 10-13
Water pump malfunction
Check the impeller. 8-12
Check the impeller key. 8-12
Check the water pump housing. 8-12
Check the insert cartridge. 8-12
Check the outer plate cartridge. 8-12
Clogged cooling water pas-
sage
Check the cooling water passage. 2-43
Thermostat malfunction Check the thermostat. 7-68
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