4-12
Outboard motor troubleshooting
Symptom 1: Unstable engine idle speed, poor acceleration, poor performance, or limited
engine speed.
Fuel not supplied
(all cylinders)
— Measure the fuel pressure. 6-5
Clogged filter
Check the fuel filter for dirt and obstruc-
tions.
6-9
Fuel leakage Check the fuel line for leakage. 6-1
High-pressure fuel pump mal-
function
Check the high-pressure fuel pump oper-
ation using the YDIS.
5-18
Measure the high-pressure fuel pump
resistance.
5-18
Main relay malfunction Check the main relay. 5-13
Short, open, or loose connec-
tion in high-pressure fuel pump
circuit
Measure the high-pressure fuel pump
input voltage.
5-18
Check for wiring harness continuity
between the high-pressure fuel pump
and the main relay.
A-2
Check for wiring harness continuity
between the high-pressure fuel pump
and engine ECM.
A-2
Fuel pump malfunction
Check the fuel pump for leakage. 6-13
Check the diaphragm for tears. 6-14
Check the camshaft. 7-35
Y-COP is locked. Unlock Y-COP. 3-20
Compression pressure
is low
Improper valve timing Check the timing belt. 7-17
Compression leakage
Measure the compression pressure. 7-1
Check the valve for bends or sticking. 7-41
Check the piston and piston rings for
damage.
7-61
Check the cylinder for scratches. 7-64
— Intake air passage malfunction
Check the ISC valve for sticking. 5-15
Check the intake manifold and throttle
body for air leakage.
6-34
Symptom 2 Cause Checking steps
See
page
Throttle valve does not
move properly
Throttle valve malfunction
Check the throttle valve for proper move-
ment.
6-25
Throttle valves do not synchro-
nize.
Synchronize the throttle valves. 6-29
Throttle link and throttle cable
are not installed properly.
Adjust the throttle link and throttle cable.
3-11
6-27
Symptom 2 Cause Checking steps
See
page
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