4-31
Outboard motor troubleshooting
Symptom 1: Limited engine speed (below 2000–3000 r/min).
Symptom 2 Cause Checking steps
See
page
Buzzer comes on.
Overheat alert indica-
tor comes on
Thermo sensor malfunction
Measure the thermo senor input
voltage.
5-38
Measure the thermo sensor resis-
tance.
5-38
Check for continuity between the
thermo sensor and the engine ECM.
A-14
Engine temperature sen-
sor malfunction
Measure the engine temperature
sensor input voltage.
5-37
Check the engine temperature sen-
sor resistance.
5-37
Check for continuity between the
engine temperature sensor and the
engine ECM.
5-37
Water pressure sensor
malfunction
Measure the water pressure sensor
input voltage.
5-26
Check the water pressure sensor
out put voltage.
5-26
Check for continuity between the
water pressure sensor and the en-
gine ECM.
5-26
Clogged cooling water inlet Check the cooling water inlet. 2-53
Water pump malfunction
Check the impeller. 8-13
Check the impeller key. 8-13
Check the water pump housing. 8-13
Check the insert cartridge. 8-13
Check the outer plate cartridge. 8-13
Clogged cooling water
passage
Check the cooling water passage. 2-53
Open PCV Check the PCV. 9-29
Thermostat malfunction Check the thermostat. 7-73
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