Yamaha F30B 2018, Service Manual

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4-8
Outboard motor troubleshooting
Spark plug does not
produce a spark (all
cylinders)
Pulser coil malfunction
Measure the pulser coil output peak
voltage.
5-30
Checking the pulser coil air gap. 7-2
Measure the pulser coil resistance. 5-30
Engine ECM malfunction
Check the engine ECM output peak
voltage.
5-29
Short, open, or loose con-
nection in the pulser coil cir-
cuit Check for wire harness continuity
between the pulser coil and the en-
gine ECM.
A-15
Y-COP is locked. Unlock Y-COP. —
Fuel not supplied (all
cylinders)
Pinched or kinked fuel hose Check the fuel hose. 2-15
Clogged fuel filter element
Check the fuel filter element for dirt
and obstructions.
6-5
Clogged fuel strainer
Check the fuel strainer for dirt and
obstructions.
6-22
Fuel leakage Check the fuel line for leakage. 2-15
High-pressure fuel pump
malfunction
Check the high-pressure fuel pump
operation using the YDIS.
5-24
Measure the high-pressure fuel
pump resistance.
5-24
Main relay malfunction Check the main relay. 5-17
Short, open, or loose con-
nection in high-pressure
fuel pump circuit
Measure the high-pressure fuel
pump input voltage.
5-24
Check for continuity between the
high-pressure fuel pump and the
main relay.
A-15
Check for continuity between the
high-pressure fuel pump and
ground.
A-15
Fuel pump malfunction
Check the fuel pump for leakage. 6-9
Check the diaphragm for tears. 6-10
Check the rocker arm. 7-40
Y-COP is locked. Unlock Y-COP. —
Compression pres-
sure is low
Improper valve timing
Check the valve timing. 7-16
Check the timing belt. 7-15
Compression leakage
Check the valve for bends or stick-
ing.
7-33
Check the piston and piston rings for
damage.
7-49
Check the cylinder for scratches. 7-51
Symptom 2 Cause Checking steps
See
page